Reference conditions and procedures for testing industrial and process measurement transmitters - Part 2: Specific procedures for pressure transmitters

IEC 62828-2:2026 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery. A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested. For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of process measurement transmitters.
NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters".
This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision according to the latest IEC rules;
b) comparison with the general part of IEC 62828-1;
c) additions and more precise definitions in the “Terms and definitions” clause;
d) correction of the calculation formulas for the measurement error;
e) more precise formulation of long-term drift;
f) extension of additional tests;
g) transfer of the annex “Example of signal current range for a 4 to 20 mA PMT” in IEC 62828-1;
h) new Annex C “Main characteristics for pressure transmitters”.

Conditions de référence et procédures pour l'essai des transmetteurs de mesure industrielle et de processus - Partie 2: Procédures spécifiques pour les transmetteurs de pression

IEC 62828-2:2026 est disponible sous forme de IEC 62828-2:2026 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 62828-2:2026 établit les procédures d'essai spécifiques des transmetteurs de mesure de processus (PMT, Process Measurement Transmitter) de pression utilisés dans les systèmes de mesure et de commande des processus industriels et des machines. Un PMT de pression peut être équipé d'un joint distant pour amener la variable de processus à l'élément de détection dans le PMT. Si le joint distant ne peut pas être séparé du PMT, l'appareil complet est soumis à l'essai. Pour les procédures d'essai générales, il est fait référence à l'IEC 62828‑1 qui s'applique à tous les types de transmetteurs de mesure de processus.
NOTE Dans des applications industrielles et de processus, les termes "transmetteurs industriels" ou "transmetteurs de processus" sont souvent utilisés pour désigner les transmetteurs de mesure de processus.
Cette deuxième édition annule et remplace la première édition parue en 2017. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) révision selon les dernières règles de l'IEC;
b) comparaison avec la partie générale de l'IEC 62828‑1;
c) ajouts et définitions plus précises à l'article "Termes et définitions";
d) correction des formules de calcul pour l'erreur de mesure;
e) formulation plus précise de la dérive à long terme;
f) extension des essais supplémentaires;
g) transfert de l'annexe "Exemple de plage de courant de signal d'un PMT 4 mA à 20 mA" dans l'IEC 62828‑1;
f) ajout d'une nouvelle Annexe C intitulée "Caractéristiques principales des transmetteurs de pression".

General Information

Status
Published
Publication Date
10-Jun-2026
Drafting Committee
WG 6 - TC 65/SC 65B/WG 6
Current Stage
PPUB - Publication issued
Start Date
11-Jun-2026
Completion Date
26-Jun-2026

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Frequently Asked Questions

IEC 62828-2:2026 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Reference conditions and procedures for testing industrial and process measurement transmitters - Part 2: Specific procedures for pressure transmitters". This standard covers: IEC 62828-2:2026 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery. A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested. For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of process measurement transmitters. NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters". This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) revision according to the latest IEC rules; b) comparison with the general part of IEC 62828-1; c) additions and more precise definitions in the “Terms and definitions” clause; d) correction of the calculation formulas for the measurement error; e) more precise formulation of long-term drift; f) extension of additional tests; g) transfer of the annex “Example of signal current range for a 4 to 20 mA PMT” in IEC 62828-1; h) new Annex C “Main characteristics for pressure transmitters”.

IEC 62828-2:2026 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery. A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested. For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of process measurement transmitters. NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters". This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) revision according to the latest IEC rules; b) comparison with the general part of IEC 62828-1; c) additions and more precise definitions in the “Terms and definitions” clause; d) correction of the calculation formulas for the measurement error; e) more precise formulation of long-term drift; f) extension of additional tests; g) transfer of the annex “Example of signal current range for a 4 to 20 mA PMT” in IEC 62828-1; h) new Annex C “Main characteristics for pressure transmitters”.

IEC 62828-2:2026 is classified under the following ICS (International Classification for Standards) categories: 17.100 - Measurement of force, weight and pressure; 25.040.40 - Industrial process measurement and control. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC 62828-2:2026 has the following relationships with other standards: It is inter standard links to IEC 62828-2:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

IEC 62828-2:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


IEC 62828-2 ®
Edition 2.0 2026-06
INTERNATIONAL
STANDARD
REDLINE VERSION
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters
ICS 17.100; 25.040.40 ISBN 978-2-8327-1335-8
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CONTENTS
FOREWORD . 3
INTRODUCTION . 1
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General description of the device and overview . 12
5 Reference test conditions . 12
6 Test procedures . 12
6.1 General . 12
6.2 Tests at standard and operating reference test conditions . 13
6.2.1 General . 13
6.2.2 Accuracy test suitable for routine and acceptance tests . 14
6.2.3 Influence of the overpressure . 14
6.2.4 Influence of static pressure . 18
6.2.5 Long-term drift . 20
6.2.6 Leakage test . 21
6.2.7 Additional tests for diaphragm/remote seals – Influence of process
temperature (long term) . 22
6.2.8 Additional tests – Burst pressure . 22
7 Test report and technical documentation . 22
7.1 General . 22
7.2 Total probable error . 22
Annex A (informative) Relationship between the SI unit and other pressure related
units . 24
Annex B (informative) Pressure process measurement transmitter (PMT) . 25
B.1 General description of a pressure PMT . 25
B.2 Typical PMTs . 25
Annex C (informative) Example of signal current range for a 4 to 20 mA PMT .
Annex C (informative)  Main characteristics for pressure transmitters . 27
Bibliography . 32

Figure 1 – Measuring range and associated properties of a pressure PMT . 9
Figure 2 – Schematic example of a test set-up for pressure PMT . 13
Figure 3 – Example of measured error plot . 15
Figure 4 – Procedure for the determination of the unilateral overpressure error . 17
Figure 5 – Schematic example of test set-up for determining the effect of the static
pressure . 18
Figure 6 – Procedure for the determination of the zero point error with static pressure . 19
Figure 7 – Procedure for the determination of the span error for static pressure . 20
Figure B.1 – Schematic example of intelligent PMT model . 26
Figure C.1 – Signal current range of a 4 mA – 20 mA transmitter (before adjustment) .

Table 1 – Example of measured errors with 20 % steps . 14
Table A.1 – Relationship between the SI unit and other pressure related units . 24
Table C.1 – Pressure-based transmitters . 29
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 62828-2:2017. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 62828-2 has been prepared by subcommittee 65B: Measurement and control devices, of
IEC technical committee 65: Industrial-process measurement, control and automation. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) revision according to the latest IEC rules;
b) comparison with the general part of IEC 62828-1;
c) additions and more precise definitions in the "Terms and definitions" clause;
d) correction of the calculation formulas for the measurement error;
e) more precise formulation of long-term drift;
f) extension of additional tests;
g) transfer of the annex "Example of signal current range for a 4 to 20 mA PMT" in
IEC 62828-1;
h) new Annex C "Main characteristics for pressure transmitters".
The text of this International Standard is based on the following documents:
Draft Report on voting
65B/1308/FDIS 65B/1319/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 62828-1:2026.
A list of all parts in the IEC 62828 series, published under the general title Reference conditions
and procedures for testing industrial and process measurement transmitters, can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
Most of the current IEC standards on industrial and process measurement transmitters are
rather old and were developed having in mind devices based on analogue technologies. Today's
digital industrial and process measurement transmitters are quite different from those analogue
transmitters: they include more functions and newer interfaces, both towards the computing
section (mostly digital electronic) and towards the measuring section (mostly mechanical). Even
if some standards dealing with digital process measurement transmitters already exist, they are
not sufficient, since some aspects of the performance are not covered by appropriate test
methods.
In addition, existing IEC test standards for industrial and process measurement transmitters are
spread over many documents, so that for manufacturers and users it is difficult, impractical and
time-consuming to identify and select all the standards to be applied to a device measuring a
specific process quantity (pressure, temperature, flow, level, etc.).
To help manufacturers and users, it was decided to review, complete and reorganize the
relevant IEC standards and to create a more suitable, effective and comprehensive standard
series that provides in a systematic way all the necessary specifications and tests required for
different industrial and process measurement transmitters.
To solve the issues mentioned above and to provide an added value for the stakeholders, the
new standard series on industrial and process measurement transmitters covers the following
main aspects:
– applicable normative references;
– specific terms and definitions;
– typical configurations and architectures for the various types of industrial and process
measurement transmitters;
– hardware and software aspects;
– interfaces (to the process, to the operator, to the other measurement and control devices);
– physical, mechanical and electrical requirements and relevant tests; clear definition of the
test categories: type tests, acceptance tests and routine tests;
– performance (its specification, tests and verification);
– environmental protection, hazardous areas application, functional safety, etc.;
– structure of the technical documentation.
To cover in a systematic way all the topics to be addressed, the IEC 62828 series is organized
in several parts. At the moment of the publication of this document, the IEC 62828 series consist
of the following parts:
– IEC 62828-1: General procedures for all types of transmitters;
– IEC 62828-2: Specific procedures for pressure transmitters;
– IEC 62828-3: Specific procedures for temperature transmitters;
– IEC 62828-4: Specific procedures for level transmitters;
– IEC 62828-5: Specific procedures for flow transmitters.
In preparing IEC 62828 (all parts), many test procedures were taken, with the necessary
improvements, from IEC 61298 (all parts). As IEC 61298 (all parts) is currently applicable to all
process measurement and control devices, when IEC 62828 (all parts) is completed, IEC 61298
(all parts) will be revised to harmonise it with IEC 62828 (all parts), taking out from its scope
the industrial and process measurement transmitters. During the time when the scope of
IEC 61298 (all parts) is being updated, the new IEC 62828 series takes precedence for
industrial and process measurement transmitters.
1 Scope
This part of IEC 62828 establishes specific procedures for testing pressure process
measurement transmitters (PMT) used in measuring and control systems for industrial
processes and for machinery control systems.
A pressure PMT can feature a remote seal to bring the process variable to the sensing element
in the PMT. When the remote seal cannot be separated from the PMT, the complete device is
tested.
For general test procedures, reference is made to IEC 62828-1, which is applicable to all types
of process measurement transmitters.
NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also
to use the terms "industrial transmitters", or "process transmitters".
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62828-1:2026, Reference conditions and procedures for testing industrial and process
measurement transmitters - Part 1: General procedures for all types of transmitters
IEC 61518, Mating dimensions between differential pressure (type) measuring instruments and
flanged-on shut-off devices up to 413 bar (41,3 MPa)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62828-1 and in
IEC 61518 as well as the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
absolute pressure
p
abs
pressure using absolute vacuum as the datum point
Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABB181.
[SOURCE: IEC 61987 #ABB181 in the IEC common data dictionary]
3.2
ambient atmospheric pressure
p
amb
pressure exerted by the atmospheric air at a given altitude and temperature
Note 1 to entry: The atmospheric pressure decreases with the altitude by about 10 Pa/m (Pascal per meter).
3.3
differential pressure
∆p
p
1,2
difference between the two (absolute) pressures that act simultaneously on opposite sides of a
membrane or a primary element
Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABB995.
[SOURCE: IEC 61987 #ABB995 in the IEC common data dictionary]
3.4
gauge pressure
p
g
pressure using atmospheric pressure as the datum point

p = p –p
g abs amb
Note 1 to entry: Gauge pressure assumes positive values when the absolute pressure is greater than the ambient
atmospheric pressure; it assumes negative values when the absolute pressure is less than the ambient atmospheric
pressure.
Note 2 to entry: In certain industrial environments, "gauge pressure" maycan be referred to as "pressure".
Note 3 to entry: The term "relative pressure" to indicate gauge pressure is obsolete and conceptually wrong, so it
should be avoided.
Note 4 to entry:Tthe CDD code of this entry for Electronic Data Exchange is ABB182.
[SOURCE: IEC 61987 #ABB182 in the IEC common data dictionary]
3.5
line pressure
static pressure
pressure applied on both sides of a differential pressure PMT
Note 1 to entry: For differential pressure PMTs, it is an influence factor that is bilateral and does not represent the
measurand.
3.6
leakage rate
leakage, permeation and/or diffusion effects of the medium through the PMT and/or its mounting
devices over the testing period under static pressure conditions, expressed as normal volume
flow rate
Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABD632.
[SOURCE: IEC 61987 #ABD632 in the IEC common data dictionary]
3.7
measuring range
range related to the measurement of absolute and gauge pressure PMTs
Note 1 to entry: For a pressure PMT with variable (adjustable or programmable) span, the measuring range and
associated terms are shown in Figure 1.
Note 2 to entry: See also Annex C G in IEC 62828-1:2026 for an example of signal current range of a 4 mA to
20 mA PMT.
Note 3 to entry: The maximum span indicates the measuring range defined by the difference between the upper
and lower range limit.
Vacuum Burst pressure
Zero
MPa
Minimum overpressure limit Lower range Upper range Maximum overpressure limit
Lower limiting value limit (LRL) limit (URL) Upper limiting value
of process pressure of process pressure
Set span
Lower range value (LRV)
Upper range value (URV)
Measuring range
(maximum span)
IEC
Figure 1 – Measuring range and associated properties of a pressure PMT
3.8
set span
difference between the upper and lower range value of pressure to which a pressure
measurement instrument is adjusted
[SOURCE: IEC 61987 #ABB570 in the IEC common data dictionary]
3.9
Maximum Working Pressure
MWP
highest pressure a device can be continuously exposed to during operation
Note 1 to entry: Maximum Working Pressure (MWP) is equal to the upper range limit (URL), if not otherwise
specified in the product documentation.
3.10
overpressure limit
OPL
proof pressure
multiple of indicated range Maximum Working Pressure with which the device may can be
temporarily subjected to pressure without permanent damage and without change of the
guaranteed metrological properties after returning to the measuring range
Note 1 to entry: The output signal at the overpressure limit is sometimes unreliable and/or not predictable. The
specification applies to the maximum permitted medium temperature.
Note 2 to entry: After returning to the measuring range, the guaranteed metrological properties shall remain
unchanged.
Note 3 to entry: The CDD code of this entry for Electronic Data Exchange is ABC027.
[SOURCE: IEC 61987 #ABC027 in the IEC common data dictionary]
3.11
minimum pressure limit
pressure at which the device is permitted to be subjected without permanent damage and
without change of the guaranteed metrological properties after returning to the measuring range
3.12
pressure
force per unit area applied in a direction perpendicular to a surface
Note 1 to entry: The SI unit for pressure is the Pascal (Pa), equal to one Newton per square metre (N/m or
-1 -2
kg m s ).
Note 2 to entry: In Annex A, a table shows the relationship between the SI unit and other units, often used for process
measurement transmitter applications.
Note 3 to entry: For the purpose of this document, a simplified definition could be accepted as follows: Ratio of
orthogonal component of the force per unit area to that unit area".
3.13
fixed scale pressure transmitter
pressure transmitter with fixed measuring range set by the manufacturer
3.14
variable scale pressure transmitter
pressure transmitter with an adjustable measuring range (turndown ratio)
3. 15
burst pressure
maximum pressure that can be applied to the instrument without physically damaging the
internal sensing component and potentially compromising device integrity
Note 1 to entry: Above the burst pressure the device function and integrity is no longer guaranteed.
3.16
vacuum
state of a fluid whose pressure is less than atmospheric pressure
3.17
diaphragm seal
remote seal
functional component that transfers the pressure to be measured to the PMT by hydraulic path
and decouples the PMT from influence factors stemming from the process
Note 1 to entry: A remote seal is connected to the transmitter by a capillary; the diaphragm seal is usually an
integral part of the transmitter.
Note 2 to entry: The primary purpose of using diaphragm/remote seals is to protect the sensing element against
high process temperatures or aggressive media.
Note 3 to entry: A diaphragm made of suitable material is responsible for the separation of the measured
fluids/gases and transmitter. A fluid adapted to the measurement task is responsible for the transfer of the pressure
to the measuring element.
Note 4 to entry: The diaphragm seal is included in the treatment of the total measurement error (e.g. temperature
influence, step response time, vacuum stability, etc.).
3.18
manifold
pipe fitting or similar device, such as a flanged joint, that connects multiple inputs or outputs,
allowing differential pressure PMTs to connect to the process
3.19
pressure transmitter
transmitter that outputs a signal representative of a pressure
3.20
destructive range
pressure range in which permanent changes occur to the metrological properties of the pressure
sensor and in which the transducer/transmitter can also be mechanically damaged
Note 1 to entry: It begins at the upper limit of the overload range.
3.21
upper range limit
URL
full scale
FS
upper range limit is the highest value of pressure that a device can be adjusted to measure
within its specified accuracy limits
[SOURCE: IEC 61987 #ABB212 in the IEC common data dictionary]
3.22
lower range limit
LRL
lowest value of pressure that the device can be adjusted to measure within the specified
accuracy limits
[SOURCE: IEC 61987 #ABB214 in the IEC common data dictionary]
3.23
turndown ratio
turndown
ratio of the maximum span to the set span
Note 1 to entry: Turndown (TD) = URL/|URV - LRV|
[SOURCE: IEC 61987-13:2016, 3.2.3, modified – The second preferred term has been added
as well as the Note to entry.]
4 General description of the device and overview
The general description outlined in Clause 4 of IEC 62828-1:20172026 is applicable.
For the scope of this document, see a more detailed description of the functional blocks of an
intelligent pressure PMT in Annex B.
5 Reference test conditions
To verify the influence of external quantities on accuracy as well as the mechanical and
electrical conditions which a device can withstand and still work within specification, Clause 5
of IEC 62828-1:20172026 applies, both for standard reference test conditions and for operating
reference test conditions.
6 Test procedures
6.1 General
Clause 6 of IEC 62828-1:20172026 shall apply, with the following additional specifications.
®1
An example of schematic test set-up with an optional HART digital output is shown in
Figure 3 analogue or digital output signal is shown in Figure 2. A more detailed diagram showing
an intelligent PMT model is found in Annex B, Figure B.1.
___________
HART® is the trade name of a communication protocol specified by FieldComm Group. This information is given
for the convenience of users of this document and does not constitute an endorsement by IEC of the product
named. Equivalent products may be used if they can be shown to lead to the same results.
Standard pressure Optional wireless
Power Supply
output signal
measuring
(internal or
instrument external)
Test Analogue or
PMT
pressure digital output
under test
source signal
Pressure
port
IEC
Figure 2 – Schematic example of a test set-up for pressure PMT
The test pressure source and the standard pressure measuring instrument could be the same,
as for example for the application of pressure calibrators or pressure balances, namely also
dead weight calibrators.
Usually, the power supply is necessary except for wireless PMTs working with internal battery.
For batteries, the voltage tolerance listed in Table 5 of IEC 62828-1:2026 shall be fulfilled,
meaning the battery needs an adequate charging state for performance tests.
The optional digital output signal is provided for smart and Intelligent PMTs and is detected by
handheld or PC communicator.
Usually, for differential pressure PMTs, the pressure is generated in the high-pressure port with
the low pressure port open to the atmospheric pressure. ®
Analogue and digital output signals are mutually exclusive, unless HART is in use commonly
mutually exclusive. For reference, in Annex A, Table A.1 contains the conversion between
several pressure units.
6.2 Tests at standard and operating reference test conditions
6.2.1 General
For the majority of the tests, 6.2.1 and 6.3 of IEC 62828-1:20172026 apply. In particular, see:
– Annex B in IEC 62828-1:20172026 for the summary of the tests at the standard reference
conditions;
– Annex C in IEC 62828-1:20172026 for the summary of the tests at the operating reference
conditions.
In addition, the specific tests in 6.2.1 6.2.2 to 6.2.7 apply to pressure PMTs.
6.2.2 Accuracy test suitable for routine and acceptance tests
6.2.2.1 General
The input-output characteristic under reference conditions shall be measured in one
measurement cycle, traversing the full range in each direction. For this, at least five
measurement points should be evenly distributed over the range; they should include points at
or near (within 10 % of span) the 0 % and 100 % values of the span.
NOTE For instruments with a non-linear input-output relationship (e.g. square law), the test points are chosen to
obtain output values equally distributed over the output span.
6.2.2.2 Measurement procedure
Initially, an input signal equal to the lower range value is generated and the value of the
corresponding input and output signal is recorded. Then the input signal is slowly (the rate of
change depends on the DUT) increased to reach, without overshoot, the first test point. After a
sufficient stabilization period (e.g. reaching a steady state), the value of the corresponding input
and output signal is recorded.
The operation is repeated for all the predetermined values up to 100 % of the input span. After
measurement at this point, the input signal is slowly decreased without overshoot the test value
directly below 100 % of input span and then to all other values in turndown to 0 % of input span,
thus closing the measurement cycle.
6.2.2.3 Elaboration data
The difference between the output signal values obtained at the test points for each upscale
and downscale traverse and the corresponding ideal values are recorded and their algebraic
differences are reported as measured errors. The errors shall generally be expressed as
percent of the ideal output span. All the error values obtained shall be shown in a tabular form
(see Table 1) and presented graphically (see Figure 6 Figure 3).
Table 1 – Example of measured errors with 20 % steps
Output (% of span) 0 20 40 60 80 100
Measured error up 0 0,09 -0,04 -0,23 -0,22 0,10
Measured error down -0,06 0,26 0,17 -0,08 -0,13
Maximum measured error -0,06 0,26 0,17 -0,23 -0,22 0,10
Hysteresis 0,17 0,21 0,15 0,09

From Table 1, the maximum measured error found is 0,26 % and the maximum hysteresis is
0,21 %. The repeatability hysteresis is the maximum deviation of the corresponding values of
the up-and-down cycle.
For differential pressure PMTs, the measurement cycle is done for the positive high pressure
side as well as for the negative low pressure side of the pressure transmitter. For measurement
of the negative side the current output of the transmitter with analogue output 4 mA to 20 mA
shall be configured to permit the whole pressure range covering. Zero elevation shall be
considered, if necessary, to permit the pressure measurement, the current output of transmitters
with analogue output 4 mA to 20 mA shall be configured to match this pressure range.
The data from Table 1 are plotted in Figure 4.
0,3
0,2
Maximum
0,1
Maximum
0 10 20 30 40 50 60 70 80 90 100
–0,1
–0,2
–0,3
Output (% span)
IEC
Figure 3 – Example of measured error plot
6.2.3 Influence of the overpressure
6.2.3.1 General
To quantify the influence of the overpressure for gauge pressure and absolute pressure PMTs,
the test shall be carried out following the procedure described in 6.2.3.9 of
IEC 62828-1:20172026, i.e. by measuring any residual changes in lower range-value limit and
span which result from over ranging the input at a level between 150 % to 200 % of full scale,
if not otherwise specified by the manufacturer at 150 % of Maximum Working Pressure (MWP),
if not otherwise specified in the product documentation. This specified pressure is equal to the
overpressure limit. The overpressure limit requires to be lower than the burst pressure, if stated.
For differential pressure PMTs, the additional tests in 6.2.4 shall be performed.
The results shall be reported according to Clause 7.
Deviation (% output span)
6.2.3.2 Influence of bilateral overpressure for differential pressure PMT
The test shall be carried out following the procedure described in 6.2.3.9 of
IEC 62828-1:20172026, i.e. by measuring any residual changes in lower range-value and span
which result from overranging the input by 50 % at the minimum and maximum span settings,
if not otherwise specified in the manufacturer product documentation, and applying the
overpressure in turn to both inputs of the pressure differential PMT ports.
Unless otherwise specified, as common practice, minimum overpressure conditions are as
follows:
– pressure rising time: < 1 min;
– exposition time: minimum 5 min;
– remaining time: maximum 30 min;
– remaining zero-error within the reference accuracy.
Restrictions after returning from the overload range shall be specified in the documentation.
NOTE The influence of bilateral overpressure is defined in IEC 61987-13.
6.2.3.3 Influence of alternating unilateral overpressure for differential pressure PMT
The test is performed by applying successively the maximum positive and then the maximum
negative allowed overpressure to one side of a differential pressure transmitter. The maximum
deviation (in % of the span) between t to t or t to t of zero pressure reading after the test
1 2 2 3
shall be recorded. Figure 5 Figure 4 gives additional information and with an example explains
how to perform the test and calculate the error.
Key
p maximum static pressure
N
max. pp−
ti ti+1
F = x 100
w
M
span
where
F is the measurement error with unilateral overpressure;
w
M is the maximum span;
span
p is the pressure at time ti;
ti
p is the specification p in bar/100 pressure output signal of the PMT at time ti+1
ti+1 n .
Figure 4 – Procedure for the determination of the unilateral overpressure error
6.2.3.4 Influence of alternating bilateral overpressure for differential pressure PMT
The test is performed by applying the maximum positive and then the maximum negative
allowed overpressure successively to both sides of a differential pressure transmitter. The
maximum deviation (in % of the span) between t to t or t to t of zero pressure reading after
1 2 2 3
the test shall be recorded. Figure 5 gives additional information and with an example explains
how to perform the test and calculate the error.
Static pressure
measuring
i
I/1
Static
High
Output
pressure
signal
source
I/2 monitor
DUT
Low
I/3 To atmosphere
High pressure
differential
instrument
IEC
Figure 5 – Schematic example of test set-up for determining the effect of the static
pressure
6.2.4 Influence of static pressure
6.2.4.1 General
For differential pressure PMTs, the tests in 6.2.4.2 shall be performed. Results shall be reported
according to Clause 7.
6.2.4.2 Influence of static pressure on zero and span
This test is conducted to determine the effect on the output due to changes in process static
pressure applied on both sides (bilateral application) of a differential pressure transmitter and
to measure the influence on zero and on span per given pressure interval.
The static pressure error is the difference between the output at each static pressure and the
output at atmospheric pressure.
The recommended test set-up is shown in Figure 6 Figure 5.
The input difference is set by adjustment of V and V to maintain a constant value as measured
2 3
by the high-pressure differential instrument, whilst the static pressure is varied by means of V .
During the test, it is important to avoid the generation of false effects, for example differential
pressures within the unit, which would invalidate the test results. Such differential pressures
may can be caused by quickly changing static pressure or by changes in ambient temperature
(see Note 1).
NOTE 1 Due attention is given to the effect of change in pressure in a closed system caused by changes in ambient
temperature, and the difficulty of measuring the change of span at high static pressure.
NOTE 2 A manifold standardized in accordance with IEC 61518 could be used to connect the high and low ports of
the PMT. The test is carried out at 10 % and 90 % of input by recording the changes in output at each 25 % increment
of the static pressure between atmospheric pressure and the maximum working static pressure of the DUT.
NOTE 3 When it is not possible to simulate the 10 and 90 % of input, the test is done with the same static pressure
at both inputs, checking, for every increment of the static pressure the variations of the zero of the PMT.
If the span is adjustable, the test shall be conducted at the nominal or arithmetic mean of
maximum and minimum spans.
With reference to Figure 7 Figure 6, the zero point error p for bilateral applied static pressure
KN
is the maximum deviation between t to t or t to t .
1 2 2 3
Figure 7Figure 6 also provides additional information and shows an example of how to perform
the test and calculate the error.

max. pp−
ti+1 ti
px= 100
kn
p
N
M ×
span
p
Base
where
p is the deviation of the zero output for bilateral applied static pressure;
kn
M is the maximum span;
span
p is the maximum static pressure;
N
p is the pressure output signal of the PMT at time ti;
ti
p is the specification p in bar/100 pressure output signal of the PMT at time ti+1;
ti+1 N
p is the specified rated base value.
Base
Figure 6 – Procedure for the determination of the zero point error with static pressure
With reference to Figure 8,Figure 7, the span error pks for bilateral applied static pressure
(without zero point error) is the maximum deviation between t to t or t to t .
1 2 2 3
Figure 8Figure 7 also provides additional information and shows an example of how to perform
the test and calculate the error.

max. pp−
ti+1 ti
p = x 100
ks
p
N
M ×
span
p
Base
where
p is the deviation of the span signals for bilateral applied static pressure
ks
M is the maximum span;
span
p is the maximum static pressure;
N
p is the pressure output signal of the PMT at time ti;
ti
is the specification p in bar/100 pressure output signal of the PMT at time ti+1;
p
ti+1 N
p is the specified rated base value.
Base
Figure 7 – Procedure for the determination of the span error for static pressure
The results of the test are recorded, according to Clause 7, in terms of deviation of pressure
reading from zero and in terms of difference between the actual span and the maximum span,
expressed as percentage of maximum span.
In certain cases, especially at high pressure, it may is not be always possible to generate and
measure the changes in span: in these cases, only the influence on zero shall be measured
and in the test report the reason for not completing the test shall be justified.
6.2.5 Long-term drift
6.2.5.1 General procedure
The long-term drift shall be determined with the test set-up as shown in Figure 3 Figure 2 as
follows.
Vent the transmitter to record the 0 % ambient pressure value (zero) (e.g. for gauge: 0 %) and
use a pressure calibrator with suitable accuracy for the generation of the 100 % pressure value.
Then, operate the PMT for 30 days with a steady input signal to provide 90 % output(s) with an
accuracy of 5 %.
Measurement of the PMT response shall be read, if possible, every day and duly recorded.
From 0 % vent and 100 % pressure, the drift from zero and span can be calculated by a simple
comparison of the recorded values with before and after the zero value test.
During the measurement, care is taken that time is sufficient for all signals to stabilize. Care
shall also be taken to ensure that Changes due to environmental conditions, other than time,
do not mask the effects of long-term drift.
Measurement values at the specific measurement point may only be accepted when all signals
(input and output signals) are at a stable state. Changes due to environmental conditions, other
than time, shall not mask the effects of long-term drift.
For absolute pressure PMTs with an URL below ambient pressure, use a pressure calibrator to
set the pressure to 50 % of the URL.
6.2.5.2 Additional test procedure for gauge press
...


IEC 62828-2 ®
Edition 2.0 2026-06
INTERNATIONAL
STANDARD
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters
ICS 17.100; 25.040.40 ISBN 978-2-8327-1268-9

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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description of the device and overview . 9
5 Reference test conditions . 9
6 Test procedures . 10
6.1 General . 10
6.2 Tests at standard and operating reference test conditions . 10
6.2.1 General . 10
6.2.2 Accuracy test suitable for routine and acceptance tests . 11
6.2.3 Influence of the overpressure . 12
6.2.4 Influence of static pressure . 14
6.2.5 Long-term drift . 16
6.2.6 Leakage test . 17
6.2.7 Additional tests for diaphragm/remote seals – Influence of process
temperature (long term) . 18
6.2.8 Additional tests – Burst pressure . 18
7 Test report and technical documentation . 18
7.1 General . 18
7.2 Total probable error . 18
Annex A (informative) Relationship between the SI unit and other pressure related
units . 20
Annex B (informative) Pressure process measurement transmitter (PMT) . 21
B.1 General description of a pressure PMT . 21
B.2 Typical PMTs . 21
Annex C (informative)  Main characteristics for pressure transmitters . 23
Bibliography . 26

Figure 1 – Measuring range and associated properties of a pressure PMT . 7
Figure 2 – Schematic example of a test set-up for pressure PMT . 10
Figure 3 – Example of measured error plot . 12
Figure 4 – Procedure for the determination of the unilateral overpressure error . 13
Figure 5 – Schematic example of test set-up for determining the effect of the static
pressure . 14
Figure 6 – Procedure for the determination of the zero point error with static pressure . 15
Figure 7 – Procedure for the determination of the span error for static pressure . 16
Figure B.1 – Schematic example of intelligent PMT model . 22

Table 1 – Example of measured errors with 20 % steps . 11
Table A.1 – Relationship between the SI unit and other pressure related units . 20
Table C.1 – Pressure-based transmitters . 23

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 62828-2 has been prepared by subcommittee 65B: Measurement and control devices, of
IEC technical committee 65: Industrial-process measurement, control and automation. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) revision according to the latest IEC rules;
b) comparison with the general part of IEC 62828-1;
c) additions and more precise definitions in the "Terms and definitions" clause;
d) correction of the calculation formulas for the measurement error;
e) more precise formulation of long-term drift;
f) extension of additional tests;
g) transfer of the annex "Example of signal current range for a 4 to 20 mA PMT" in
IEC 62828-1;
h) new Annex C "Main characteristics for pressure transmitters".
The text of this International Standard is based on the following documents:
Draft Report on voting
65B/1308/FDIS 65B/1319/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 62828-1:2026.
A list of all parts in the IEC 62828 series, published under the general title Reference conditions
and procedures for testing industrial and process measurement transmitters, can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
Most of the current IEC standards on industrial and process measurement transmitters are
rather old and were developed having in mind devices based on analogue technologies. Today's
digital industrial and process measurement transmitters are quite different from those analogue
transmitters: they include more functions and newer interfaces, both towards the computing
section (mostly digital electronic) and towards the measuring section (mostly mechanical). Even
if some standards dealing with digital process measurement transmitters already exist, they are
not sufficient, since some aspects of the performance are not covered by appropriate test
methods.
In addition, existing IEC test standards for industrial and process measurement transmitters are
spread over many documents, so that for manufacturers and users it is difficult, impractical and
time-consuming to identify and select all the standards to be applied to a device measuring a
specific process quantity (pressure, temperature, flow, level, etc.).
To help manufacturers and users, it was decided to review, complete and reorganize the
relevant IEC standards and to create a more suitable, effective and comprehensive standard
series that provides in a systematic way all the necessary specifications and tests required for
different industrial and process measurement transmitters.
To solve the issues mentioned above and to provide an added value for the stakeholders, the
new standard series on industrial and process measurement transmitters covers the following
main aspects:
– applicable normative references;
– specific terms and definitions;
– typical configurations and architectures for the various types of industrial and process
measurement transmitters;
– hardware and software aspects;
– interfaces (to the process, to the operator, to the other measurement and control devices);
– physical, mechanical and electrical requirements and relevant tests; clear definition of the
test categories: type tests, acceptance tests and routine tests;
– performance (its specification, tests and verification);
– environmental protection, hazardous areas application, functional safety, etc.;
– structure of the technical documentation.
To cover in a systematic way all the topics to be addressed, the IEC 62828 series is organized
in several parts. At the moment of the publication of this document, the IEC 62828 series consist
of the following parts:
– IEC 62828-1: General procedures for all types of transmitters;
– IEC 62828-2: Specific procedures for pressure transmitters;
– IEC 62828-3: Specific procedures for temperature transmitters;
– IEC 62828-4: Specific procedures for level transmitters;
– IEC 62828-5: Specific procedures for flow transmitters.

1 Scope
This part of IEC 62828 establishes specific procedures for testing pressure process
measurement transmitters (PMT) used in measuring and control systems for industrial
processes and for machinery.
A pressure PMT can feature a remote seal to bring the process variable to the sensing element
in the PMT. When the remote seal cannot be separated from the PMT, the complete device is
tested.
For general test procedures, reference is made to IEC 62828-1, which is applicable to all types
of process measurement transmitters.
NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also
to use the terms "industrial transmitters", or "process transmitters".
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62828-1:2026, Reference conditions and procedures for testing industrial and process
measurement transmitters - Part 1: General procedures for all types of transmitters
IEC 61518, Mating dimensions between differential pressure (type) measuring instruments and
flanged-on shut-off devices up to 413 bar (41,3 MPa)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62828-1 and in
IEC 61518 as well as the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
absolute pressure
p
abs
pressure using absolute vacuum as the datum point
[SOURCE: IEC 61987 #ABB181 in the IEC common data dictionary]
3.2
ambient atmospheric pressure
p
amb
pressure exerted by the atmospheric air at a given altitude and temperature
Note 1 to entry: The atmospheric pressure decreases with the altitude by about 10 Pa/m (Pascal per meter).
3.3
differential pressure
∆p
p
1,2
difference between the two (absolute) pressures that act simultaneously on opposite sides of a
membrane or a primary element
[SOURCE: IEC 61987 #ABB995 in the IEC common data dictionary]
3.4
gauge pressure
p
g
pressure using atmospheric pressure as the datum point

p = p –p
g abs amb
Note 1 to entry: Gauge pressure assumes positive values when the absolute pressure is greater than the ambient
atmospheric pressure; it assumes negative values when the absolute pressure is less than the ambient atmospheric
pressure.
Note 2 to entry: In certain industrial environments, "gauge pressure" can be referred to as "pressure".
Note 3 to entry: The term "relative pressure" to indicate gauge pressure is obsolete and conceptually wrong, so it
should be avoided.
[SOURCE: IEC 61987 #ABB182 in the IEC common data dictionary]
3.5
line pressure
static pressure
pressure applied on both sides of a differential pressure PMT
Note 1 to entry: For differential pressure PMTs, it is an influence factor that is bilateral and does not represent the
measurand.
3.6
leakage rate
leakage, permeation and/or diffusion effects of the medium through the PMT and/or its mounting
devices over the testing period under static pressure conditions, expressed as normal volume
flow rate
[SOURCE: IEC 61987 #ABD632 in the IEC common data dictionary]
3.7
measuring range
range related to the measurement of absolute and gauge pressure PMTs
Note 1 to entry: For a pressure PMT with variable (adjustable or programmable) span, the measuring range and
associated terms are shown in Figure 1.
Note 2 to entry: See also Annex G in IEC 62828-1:2026 for an example of signal current range of a 4 mA to 20 mA
PMT.
Note 3 to entry: The maximum span indicates the measuring range defined by the difference between the upper
and lower range limit.
Figure 1 – Measuring range and associated properties of a pressure PMT
3.8
set span
difference between the upper and lower range value of pressure to which a pressure
measurement instrument is adjusted
[SOURCE: IEC 61987 #ABB570 in the IEC common data dictionary]
3.9
Maximum Working Pressure
MWP
highest pressure a device can be continuously exposed to during operation
Note 1 to entry: Maximum Working Pressure (MWP) is equal to the upper range limit (URL), if not otherwise
specified in the product documentation.
3.10
overpressure limit
OPL
proof pressure
multiple of Maximum Working Pressure with which the device can be temporarily subjected to
pressure without permanent damage and without change of the guaranteed metrological
properties after returning to the measuring range
Note 1 to entry: The output signal at the overpressure limit is sometimes unreliable and/or not predictable.
Note 2 to entry: After returning to the measuring range, the guaranteed metrological properties shall remain
unchanged.
[SOURCE: IEC 61987 #ABC027 in the IEC common data dictionary]
3.11
minimum pressure limit
pressure at which the device is permitted to be subjected without permanent damage and
without change of the guaranteed metrological properties after returning to the measuring range
3.12
pressure
force per unit area applied in a direction perpendicular to a surface
Note 1 to entry: The SI unit for pressure is the Pascal (Pa), equal to one Newton per square metre (N/m or
-1 -2
kg m s ).
Note 2 to entry: In Annex A, a table shows the relationship between the SI unit and other units, often used for process
measurement transmitter applications.
Note 3 to entry: For the purpose of this document, a simplified definition could be accepted as follows: Ratio of
orthogonal component of the force per unit area.
3.13
fixed scale pressure transmitter
pressure transmitter with fixed measuring range set by the manufacturer
3.14
variable scale pressure transmitter
pressure transmitter with an adjustable measuring range (turndown ratio)
3.15
burst pressure
maximum pressure that can be applied to the instrument without physically damaging the
internal sensing component and potentially compromising device integrity
Note 1 to entry: Above the burst pressure the device function and integrity is no longer guaranteed.
3.16
vacuum
state of a fluid whose pressure is less than atmospheric pressure
3.17
diaphragm seal
remote seal
functional component that transfers the pressure to be measured to the PMT by hydraulic path
and decouples the PMT from influence factors stemming from the process
Note 1 to entry: A remote seal is connected to the transmitter by a capillary; the diaphragm seal is usually an
integral part of the transmitter.
Note 2 to entry: The primary purpose of using diaphragm/remote seals is to protect the sensing element against
high process temperatures or aggressive media.
Note 3 to entry: A diaphragm made of suitable material is responsible for the separation of the measured
fluids/gases and transmitter. A fluid adapted to the measurement task is responsible for the transfer of the pressure
to the measuring element.
Note 4 to entry: The diaphragm seal is included in the treatment of the total measurement error (e.g. temperature
influence, step response time, vacuum stability, etc.).
3.18
manifold
pipe fitting or similar device, such as a flanged joint, that connects multiple inputs or outputs,
allowing differential pressure PMTs to connect to the process
3.19
pressure transmitter
transmitter that outputs a signal representative of a pressure
3.20
destructive range
pressure range in which permanent changes occur to the metrological properties of the pressure
sensor and in which the transducer/transmitter can also be mechanically damaged
Note 1 to entry: It begins at the upper limit of the overload range.
3.21
upper range limit
URL
full scale
FS
upper range limit is the highest value of pressure that a device can be adjusted to measure
within its specified accuracy limits
[SOURCE: IEC 61987 #ABB212 in the IEC common data dictionary]
3.22
lower range limit
LRL
lowest value of pressure that the device can be adjusted to measure within the specified
accuracy limits
[SOURCE: IEC 61987 #ABB214 in the IEC common data dictionary]
3.23
turndown ratio
turndown
ratio of the maximum span to the set span
Note 1 to entry: Turndown (TD) = URL/|URV - LRV|
[SOURCE: IEC 61987-13:2016, 3.2.3, modified – The second preferred term has been added
as well as the Note to entry.]
4 General description of the device and overview
The general description outlined in Clause 4 of IEC 62828-1:2026 is applicable.
For the scope of this document, see a more detailed description of the functional blocks of an
intelligent pressure PMT in Annex B.
5 Reference test conditions
To verify the influence of external quantities on accuracy as well as the mechanical and
electrical conditions which a device can withstand and still work within specification, Clause 5
of IEC 62828-1:2026 applies, both for standard reference test conditions and for operating
reference test conditions.
6 Test procedures
6.1 General
Clause 6 of IEC 62828-1:2026 shall apply, with the following additional specifications.
An example of schematic test set-up with analogue or digital output signal is shown in Figure 2.
A more detailed diagram showing an intelligent PMT model is found in Annex B, Figure B.1.

Figure 2 – Schematic example of a test set-up for pressure PMT
The test pressure source and the standard pressure measuring instrument could be the same,
as for example for the application of pressure calibrators or pressure balances, namely also
dead weight calibrators.
Usually, the power supply is necessary except
...


IEC 62828-2 ®
Edition 2.0 2026-06
NORME
INTERNATIONALE
Conditions de référence et procédures pour l'essai des transmetteurs de mesure
industrielle et de processus -
Partie 2: Procédures spécifiques pour les transmetteurs de pression
ICS 17.100; 25.040.40 ISBN 978-2-8327-1268-9

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SOMMAIRE
AVANT-PROPOS . 3
INTRODUCTION . 5
1 Domaine d'application . 6
2 Références normatives . 6
3 Termes et définitions . 6
4 Description générale de l'appareil et vue d'ensemble . 10
5 Conditions d'essai de référence . 11
6 Procédures d'essai . 11
6.1 Généralités . 11
6.2 Essais aux conditions d'essai de référence normalisées et de
fonctionnement . 12
6.2.1 Généralités . 12
6.2.2 Essai d'exactitude adapté aux essais de réception et aux essais
individuels de série . 12
6.2.3 Influence de la surpression . 13
6.2.4 Influence de la pression statique . 16
6.2.5 Dérive à long terme . 18
6.2.6 Essai d'étanchéité . 19
6.2.7 Essais supplémentaires pour les joints à diaphragme/distants –
Influence de la température de processus (long terme) . 20
6.2.8 Essais supplémentaires – Pression d'éclatement . 20
7 Rapport d'essai et documentation technique . 20
7.1 Généralités . 20
7.2 Erreur probable totale . 20
Annexe A (informative) Relations entre l'unité SI et les autres unités associées à la
pression . 22
Annexe B (informative) Transmetteur de mesure de processeur (PMT) de pression . 23
B.1 Description générale d'un PMT de pression . 23
B.2 PMT classiques . 23
Annexe C (informative)  Caractéristiques principales des transmetteurs de pression . 25
Bibliographie . 28

Figure 1 – Étendue de mesure d'un PMT de pression et propriétés associées . 8
Figure 2 – Exemple schématique de montage d'essai pour PMT de pression . 11
Figure 3 – Exemple de tracé de l'erreur mesurée . 13
Figure 4 – Procédure de détermination de l'erreur de surpression unilatérale . 15
Figure 5 – Exemple schématique de montage d'essai permettant de déterminer l'effet
de la pression statique . 16
Figure 6 – Procédure de détermination de l'erreur de zéro pour la pression statique . 17
Figure 7 – Procédure de détermination de l'erreur d'intervalle pour la pression statique . 18
Figure B.1 – Exemple schématique d'un modèle de PMT intelligent . 24

Tableau 1 – Exemple d'erreurs mesurées avec échelons de 20 % . 13
Tableau A.1 – Relations entre l'unité SI et les autres unités associées à la pression . 22
Tableau C.1 – Transmetteurs de pression . 25

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Conditions de référence et procédures pour l'essai
des transmetteurs de mesure industrielle et de processus -
Partie 2: Procédures spécifiques pour les transmetteurs de pression

AVANT-PROPOS
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2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure du
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y compris ses experts particuliers et les membres de ses comités d'études et des Comités nationaux de l'IEC,
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découlant de la publication ou de l'utilisation de cette Publication de l'IEC ou de toute autre Publication de l'IEC,
ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L'IEC attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation d'un
ou de plusieurs brevets. L'IEC ne prend pas position quant à la preuve, à la validité et à l'applicabilité de tout
droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'IEC n'avait pas reçu
notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
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L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de tels droits de propriété.
L'IEC 62828-2 a été établie par le sous-comité 65B: Équipements de mesure et de
contrôle-commande, du comité d'études 65 de l'IEC: Mesure, commande et automation dans
les processus industriels. Il s'agit d'une Norme internationale.
Cette deuxième édition annule et remplace la première édition parue en 2017. Cette édition
constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition
précédente:
a) révision selon les dernières règles de l'IEC;
b) comparaison avec la partie générale de l'IEC 62828-1;
c) ajouts et définitions plus précises à l'article "Termes et définitions";
d) correction des formules de calcul pour l'erreur de mesure;
e) formulation plus précise de la dérive à long terme;
f) extension des essais supplémentaires;
g) transfert de l'annexe "Exemple de plage de courant de signal d'un PMT 4 mA à 20 mA" dans
l'IEC 62828-1;
h) ajout d'une nouvelle Annexe C intitulée "Caractéristiques principales des transmetteurs de
pression".
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
65B/1308/FDIS 65B/1319/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications/.
Cette Norme internationale doit être utilisée conjointement avec l'IEC 62828-1:2026.
Une liste de toutes les parties de la série IEC 62828, publiées sous le titre général Conditions
de référence et procédures pour l'essai des transmetteurs de mesure industrielle et de
processus, se trouve sur le site web de l'IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
INTRODUCTION
La plupart des normes IEC actuelles relatives aux transmetteurs de mesure industrielle et de
processus sont assez anciennes. Elles ont été développées pour des appareils reposant sur
des technologies analogiques. Les transmetteurs numériques de mesure industrielle et de
processus actuels sont relativement différents de ces transmetteurs analogiques: ils
comprennent davantage de fonctions et des interfaces plus récentes, tant en ce qui concerne
la section de calcul (l'électronique numérique principalement) que la section de mesure
(mécanique principalement). Même s'il existe déjà des normes qui traitent des transmetteurs
numériques de mesure de processus, celles-ci ne sont pas suffisantes, car certains aspects de
leurs performances ne sont pas couverts par des méthodes d'essai appropriées.
De plus, les normes d'essai IEC existantes relatives aux transmetteurs de mesure industrielle
et de processus ont été réparties sur de nombreux documents, ce qui rend difficile, peu pratique
et long pour les fabricants et les utilisateurs d'identifier et de choisir toutes les normes à
appliquer à un appareil de mesure d'une grandeur de processus spécifique (pression,
température, débit, niveau, etc.).
Afin d'aider les fabricants et les utilisateurs, il a été décidé de revoir, compléter et réorganiser
les normes IEC correspondantes et de créer une série de normes plus adaptées, efficaces et
exhaustives, fournissant de manière systématique toutes les spécifications nécessaires et tous
les essais exigés pour les différents transmetteurs de mesure industrielle et de processus.
En vue de résoudre les problèmes mentionnés ci-dessus et d'offrir une valeur ajoutée aux
parties prenantes, la nouvelle série de normes sur les transmetteurs de mesure industrielle et
de processus couvre les principaux aspects suivants:
– références normatives applicables;
– termes et définitions spécifiques;
– configurations et architectures classiques des différents types de transmetteurs de mesure
industrielle et de processus;
– aspects relatifs au matériel et au logiciel;
– interfaces (avec le processus, l'opérateur, les autres appareils de mesure et de commande);
– exigences physiques, mécaniques et électriques et essais associés; définition claire des
catégories d'essais: essais de type, essais de réception et essais individuels de série;
– performances (spécifications, essais et vérifications);
– protection de l'environnement, application dans les zones dangereuses, sécurité
fonctionnelle, etc.;
– structure de la documentation technique.
Afin de couvrir de manière systématique tous les sujets à traiter, la série IEC 62828 est
organisée en plusieurs parties. Au moment de la publication du présent document, la série
IEC 62828 comprend les parties suivantes:
– IEC 62828-1: Procédures générales pour tous les types de transmetteurs;
– IEC 62828-2: Procédures spécifiques pour les transmetteurs de pression;
– IEC 62828-3: Procédures spécifiques pour les transmetteurs de température;
– IEC 62828-4: Procédures spécifiques pour les transmetteurs de niveau;
– IEC 62828-5: Procédures spécifiques pour les transmetteurs de débit.

1 Domaine d'application
La présente partie de l'IEC 62828 établit les procédures d'essai spécifiques des transmetteurs
de mesure de processus (PMT, Process Measurement Transmitter) de pression utilisés dans
les systèmes de mesure et de commande des processus industriels et des machines.
Un PMT de pression peut être équipé d'un joint distant pour amener la variable de processus à
l'élément de détection dans le PMT. Si le joint distant ne peut pas être séparé du PMT, l'appareil
complet est soumis à l'essai.
Pour les procédures d'essai générales, il est fait référence à l'IEC 62828-1 qui s'applique à tous
les types de transmetteurs de mesure de processus.
NOTE Dans des applications industrielles et de processus, les termes "transmetteurs industriels" ou "transmetteurs
de processus" sont souvent utilisés pour désigner les transmetteurs de mesure de processus.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
IEC 62828-1:2026, Conditions de référence et procédures pour l'essai des transmetteurs de
mesure industrielle et de processus - Partie 1: Procédures générales pour tous les types de
transmetteurs
IEC 61518, Dimensions des raccords entre les instruments de mesure de pression différentielle
(type) et les dispositifs d'arrêt sur brides allant jusqu'à 413 bar (41,3 MPa)
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions de l'IEC 62828-1 et
l'IEC 61518, ainsi que les suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
– IEC Electropedia: disponible à l'adresse https://www.electropedia.org/
– ISO Online browsing platform: disponible à l'adresse https://www.iso.org/obp
3.1
pression absolue
p
abs
pression utilisant un vide absolu comme point de référence
[SOURCE: IEC 61987 #ABB181 dans le dictionnaire de données communes de l'IEC]
3.2
pression atmosphérique ambiante
p
amb
pression exercée par l'air atmosphérique à une altitude et une température données
Note 1 à l'article: La pression atmosphérique diminue avec l'altitude d'environ 10 Pa/m (pascal par mètre).
3.3
pression différentielle
∆p
p
1,2
différence entre les deux pressions (absolues) qui agissent simultanément sur les côtés
opposés d'une membrane ou d'un élément primaire
[SOURCE: IEC 61987 #ABB995 dans le dictionnaire de données communes de l'IEC]
3.4
pression relative
p
g
pression utilisant la pression atmosphérique en tant que point de référence

pp= – p
g abs amb
Note 1 à l'article: La pression relative prend des valeurs positives lorsque la pression absolue est supérieure à la
pression atmosphérique ambiante. Elle prend des valeurs négatives lorsque la pression absolue est inférieure à la
pression atmosphérique ambiante.
Note 2 à l'article: Dans certains environnements industriels, la "pression relative" peut être appelée "pression".
Note 3 à l'article: Le terme "pression relative" utilisé pour indiquer la pression manométrique est obsolète et erroné
d'un point de vue conceptuel. Il convient donc de l'éviter.
[SOURCE: IEC 61987 #ABB182 dans le dictionnaire de données communes de l'IEC]
3.5
pression de fluide
pression statique
pression appliquée sur les deux côtés d'un PMT de pression différentielle
Note 1 à l'article: Pour les PMT de pression différentielle, il s'agit d'un facteur d'influence qui est bilatéral
et ne représente pas le mesurande.
3.6
taux de fuite
effets de la fuite, de la perméation et/ou de la diffusion du milieu dans le PMT et/ou ses
appareils de montage, sur la période d'essai et dans les conditions de pression statique,
exprimés en tant que débit
[SOURCE: IEC 61987 #ABD632 dans le dictionnaire de données communes de l'IEC]
3.7
étendue de mesure
plage relative au mesurage des PMT de pression absolue et relative
Note 1 à l'article: Pour un PMT de pression à intervalle variable (réglable ou programmable), l'étendue de mesure
et les termes associés sont représentés sur la Figure 1.
Note 2 à l'article: Voir également l'Annexe G de l'IEC 62828-1:2026 pour un exemple de plage de courant de signal
d'un PMT 4 mA à 20 mA.
Note 3 à l'article: L'intervalle maximal indique l'étendue de mesure définie par la différence entre la limite supérieure
et la limite inférieure de l'étendue.

Figure 1 – Étendue de mesure d'un PMT de pression et propriétés associées
3.8
intervalle de mesure de réglage
différence entre les valeurs supérieure et inférieure d'étendue de pression auxquelles un
instrument de mesure de pression est réglé
[SOURCE: IEC 61987 #ABB570 dans le dictionnaire de données communes de l'IEC]
3.9
pression de service maximale
MWP
pression la plus élevée à laquelle un appareil peut être exposé en continu pendant le
fonctionnement
Note 1 à l'article: La pression de service maximale (MWP) est égale à la limite supérieure de l'étendue (URL), sauf
spécification contraire dans la documentation du produit.
Note 2 à l'article: L'abréviation "MWP" est dérivée du terme anglais développé correspondant "maximum working
pressure".
3.10
limite de surpression
OPL
pression d'épreuve
multiple de la pression de service maximale à laquelle l'appareil peut être temporairement
soumis à une pression sans dommage permanent et sans modification des propriétés
métrologiques garanties après retour à l'étendue de mesure
Note 1 à l'article: Le signal de sortie à la limite de surpression est parfois non fiable et/ou imprévisible.
Note 2 à l'article: Après être retournées à l'étendue de mesure, les propriétés métrologiques garanties ne doivent
pas avoir changé.
Note 3 à l'article: L'abréviation "OPL" est dérivée du terme anglais développé correspondant "overpressure limit".
[SOURCE: IEC 61987 #ABC027 dans le dictionnaire de données communes de l'IEC]
3.11
limite de pression minimale
pression à laquelle l'appareil peut être soumis sans dommage permanent et sans modification
des propriétés métrologiques garanties après retour à l'étendue de mesure
3.12
pression
force par unité de surface appliquée dans une direction perpendiculaire à une surface
Note 1 à l'article: L'unité SI pour la pression est le Pascal (Pa), égal à un Newton par mètre carré (N/m ou
-1 -2
kg m s ).
Note 2 à l'article: À l'Annexe A, un tableau montre les relations entre l'unité SI et les autres unités souvent utilisées
pour les applications des transmetteurs de mesure de processus.
Note 3 à l'article: Pour les besoins du présent document, une définition simplifiée pourrait être la suivante: Rapport
de la composante orthogonale de la force par unité de surface.
3.13
transmetteur de pression à échelle fixe
transmetteur de pression avec étendue de mesure fixe définie par le fabricant
3.14
transmetteur de pression à échelle variable
transmetteur de pression avec une étendue de mesure réglable (rapport de marge de réglage
effective)
3.15
pression d'éclatement
pression maximale qui peut être appliquée à l'instrument sans endommager physiquement le
composant de détection interne et sans compromettre potentiellement l'intégrité de l'appareil
Note 1 à l'article: Au-dessus de la pression d'éclatement, la fonction et l'intégrité de l'appareil ne sont plus
garanties.
3.16
vide
état d'un fluide dont la pression est inférieure à la pression atmosphérique
3.17
joint à diaphragme
joint distant
composant fonctionnel qui transfère la pression à mesurer vers le PMT par un chemin
hydraulique et qui dissocie le PMT des facteurs d'influence issus du processus
Note 1 à l'article: Un joint distant est relié au transmetteur par un tube capillaire. Le joint à diaphragme fait en
général partie intégrante du transmetteur.
Note 2 à l'article: L'objectif principal de l'utilisation de joints à diaphragme/distants est la protection de l'élément de
détection contre les températures de processus élevées ou les milieux agressifs.
Note 3 à l'article: Un diaphragme composé d'un matériau adapté assure la séparation des fluides/gaz mesurés et
du transmetteur. Un fluide adapté à la tâche de mesure assure le transfert de la pression vers l'élément de mesure.
Note 4 à l'article: Le joint à diaphragme est inclus dans le traitement de l'erreur de mesure totale (influence de la
température, temps de réponse à un échelon, stabilité à vide, etc.).
3.18
collecteur
raccord de tuyau ou appareil similaire (un joint à brides, par exemple) qui raccorde plusieurs
entrées ou sorties, permettant aux PMT de pression différentielle de se relier au processus
3.19
transmetteur de pression
transmetteur qui génère un signal représentatif d'une pression
3.20
plage destructive
plage de pression dans laquelle les propriétés métrologiques du capteur de pression subissent
des modifications permanentes et dans laquelle le transducteur/transmetteur peut également
subir des dommages mécaniques
Note 1 à l'article: Elle commence à la limite supérieure de la plage de surcharge.
3.21
limite supérieure de l'étendue
URL
pleine échelle
FS
valeur la plus élevée de pression à laquelle un appareil peut être ajusté pour mesurer dans ses
limites d'exactitude spécifiées
Note 1 à l'article: L'abréviation "URL" est dérivée du terme anglais développé correspondant "upper range limit".
Note 2 à l'article: L'abréviation "FS" est dérivée du terme anglais développé correspondant "full scale".
[SOURCE: IEC 61987 #ABB212 dans le dictionnaire de données communes de l'IEC]
3.22
limite inférieure de l'étendue
LRL
valeur la plus faible de la température mesurée à laquelle un appareil peut être réglé pour des
mesures dans ses limites de précision spécifiées
Note 1 à l'article: L'abréviation "LRL" est dérivée du terme anglais développé correspondant "lower range limit".
[SOURCE: IEC 61987 #ABB214 dans le dictionnaire de données communes de l'IEC]
3.23
rapport de marge de réglage effective
rapport de l'intervalle maximal à l'intervalle défini
Note 1 à l'article: Rapport de marge de réglage effective (TD) = URL/|URV - LRV|
[SOURCE: IEC 61987-13:2016, 3.2.3, modifié – La Note à l'article a été ajoutée.]
4 Description générale de l'appareil et vue d'ensemble
La description générale fournie à l'Article 4 de l'IEC 62828-1:2026 s'applique.
Pour le domaine d'application du présent document, voir une description plus détaillée des
blocs fonctionnels d'un PMT de pression intelligent dans l'Annexe B.
5 Conditions d'essai de référence
Pour vérifier l'influence des grandeurs externes sur l'exactitude, ainsi que les conditions
mécaniques et électriques auxquelles un appareil peut résister sans cesser de fonctionner dans
le cadre de sa spécification, l'Article 5 de l'IEC 62828-1:2026 s'applique, tant pour les
conditions d'essai de référence normalisées que pour les conditions d'essai de référence de
fonctionnement.
6 Procédures d'essai
6.1 Généralités
L'Article 6 de l'IEC 62828-1:2026 doit s'appliquer, avec les spécifications supplémentaires
suivantes.
La Figure 2 représente un exemple schématique de montage d'essai avec un signal de sortie
analogique ou numérique. À l'Annexe B, la Figure B.1 fournit un diagramme plus détaillé
représentant un modèle PMT intelligent.

Figure 2 – Exemple schématique de montage d'essai pour PMT de pression
Il est possible que la source de pression d'essai et l'appareil de mesure de pression normalisé
soient les mêmes, par exemple pour l'application d'étalonneurs de pression ou de manomètres
à piston, c'est-à-dire également les étalonneurs à poids mort.
L'alimentation électrique est généralement nécessaire, excepté pour les PMT sans fil
fonctionnant sur une batterie interne. Pour les batteries, la tolérance sur la tension indiquée
dans le Tableau 5 de l'IEC 62828-1:2026 doit être respectée, ce qui signifie que la batterie
nécessite un état de charge adéquat pour les essais de performance.
Le signal de sortie numérique facultatif est fourni pour les PMT intelligents et est détecté par
un appareil de communication portable ou un PC.
Pour les PMT de pression différentielle, la pression est normalement générée à l'a
...