prEN IEC 62828-2:2025

SLOVENSKI STANDARD
01-maj-2024
Referenčni pogoji in postopki za preskušanje industrijskih in procesnih merilnih
oddajnikov - 2. del: Posebni postopki za dajalnike tlaka
Reference conditions and procedures for testing industrial and process measurement
transmitters - Part 2: Specific procedures for pressure transmitters
Referenzbedingungen und Testmethoden für Industrie- und
Prozessmessgrößenumformer - Teil 2: Spezielle Testmethoden für Druckmessumformer
Conditions de réference et procédures pour l'essai des transmetteurs de mesure
industrielle et de processus - Partie 2: Procédures spécifiques pour les transmetteurs de
pression
Ta slovenski standard je istoveten z: prEN IEC 62828-2:2024
ICS:
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

65B/1252/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62828-2 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-03-08 2024-05-31
SUPERSEDES DOCUMENTS:
65B/1240/RR
IEC SC 65B : MEASUREMENT AND CONTROL DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr Wallie Zoller
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
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TITLE:
Reference conditions and procedures for testing industrial and process measurement transmitters -
Part 2: Specific procedures for pressure transmitters

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
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– 2 – IEC 62828-2 Ed.2 CD  IEC 202x
1 CONTENTS
2 CONTENTS . 2
3 FOREWORD . 3
4 INTRODUCTION . 5
5 1 1 Scope . 6
6 2 2 Normative references . 6
7 3 3 Terms and definitions . 6
8 4 General description of the device and overview . 9
9 5 Reference test conditions . 9
10 6 Test procedures . 10
11 6.1 General . 10
12 6.2 Tests at standard and operating reference test conditions. 10
13 6.2.1 General . 10
14 6.2.2 Accuracy test suitable for routine and acceptance tests . 10
15 6.2.3 Influence of the overpressure . 12
16 6.2.4 Influence of static pressure . 13
17 6.2.5 Long-term drift . 15
18 6.2.6 Leakage test . 16
19 6.2.7 Additional tests for diaphragm/remote seals – Influence of process
20 temperature (long term) . 16
21 7 Test report and technical documentation . 16
22 7.1 General . 16
23 7.2 Total probable error . 17
24 Annex A (informative) Relationship between the SI unit and other pressure related
25 units . 18
26 Annex B (informative) Pressure process measurement transmitter (PMT) . 19
27 B.1 General description of a pressure PMT . 19
28 B.2 Typical PMTs . 19
30 8Figure 1 – Measuring range and associated properties of a pressure PMT . 8
31 Figure 2 – Schematic example of a test set-up for pressure PMT . 10
32 Every measurement error is based on a measurement uncertainty (see Annex D). 11
33 Figure 3 – Example of measured error plot . 11
34 Figure 4 – Procedure for the determination of the unilateral overpressure error . 13
35 Figure 5 – Schematic example of test set-up for determine the effect of the static
36 pressure . 13
37 Figure 6 – Procedure for the determination of the zero point error with static pressure . 14
38 Figure 7 – Procedure for the determination of the span error for static pressure . 15
39 Figure B.1 – Schematic example of intelligent PMT model . 20
41 Table 1 – Example of measured errors. 11
42 Table A.1 – Relationship between the SI unit and other pressure related units. 18
IEC 62828-2 Ed.2 CD  IEC 202x – 3 –
45 INTERNATIONAL ELECTROTECHNICAL COMMISSION
46 ____________
48 REFERENCE CONDITIONS AND PROCEDURES FOR TESTING INDUSTRIAL
49 AND PROCESS MEASUREMENT TRANSMITTERS –
51 Part 2: Specific procedures for pressure transmitters
53 FOREWORD
54 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
55 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
56 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
57 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
58 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
59 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
60 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
61 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
62 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
63 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
64 consensus of opinion on the relevant subjects since each technical committee has representation from all
65 interested IEC National Committees.
66 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
67 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
68 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
69 misinterpretation by any end user.
70 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
71 transparently to the maximum extent possible in their national and regional publications. Any divergence between
72 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
73 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
74 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
75 services carried out by independent certification bodies.
76 6) All users should ensure that they have the latest edition of this publication.
77 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
78 members of its technical committees and IEC National Committees for any personal injury, property damage or
79 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
80 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
81 Publications.
82 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
83 indispensable for the correct application of this publication.
84 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
85 rights. IEC shall not be held responsible for identifying any or all such patent rights.
86 International Standard IEC 62828-2 has been prepared by subcommittee 65B: Measurement
87 and control devices, of IEC technical committee 65: Industrial-process measurement, control
88 and automation.
89 The text of this International Standard is based on the following documents:
FDIS Report on voting
65B/1098/FDIS 65B/1101/RVD
91 Full information on the voting for the approval of this International Standard can be found in the
92 report on voting indicated in the above table.
93 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
94 This International Standard is to be used in conjunction with IEC 62828-1.

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95 A list of all parts in the IEC 62828 series, published under the general title Reference conditions
96 and procedures for testing industrial and process measurement transmitters, can be found on
97 the IEC website.
98 The committee has decided that the contents of this document will remain unchanged until the
99 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
100 the specific document. At this date, the document will be
101 • reconfirmed,
102 • withdrawn,
103 • replaced by a revised edition, or
104 • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
IEC 62828-2 Ed.2 CD  IEC 202x – 5 –
108 INTRODUCTION
109 Most of the current IEC standards on industrial and process measurement transmitters are
110 rather old and were developed having in mind devices based on analogue technologies. Today’s
111 digital industrial and process measurement transmitters are quite different from those analogue
112 transmitters: they include more functions and newer interfaces, both towards the computing
113 section (mostly digital electronic) and towards the measuring section (mostly mechanical). Even
114 if some standards dealing with digital process measurement transmitters already exist, they are
115 not sufficient, since some aspects of the performance are not covered by appropriate test
116 methods.
117 In addition, existing IEC test standards for industrial and process measurement transmitters are
118 spread over many documents, so that for manufacturers and users it is difficult, impractical and
119 time-consuming to identify and select all the standards to be applied to a device measuring a
120 specific process quantity (pressure, temperature, flow, level, etc.).
121 To help manufacturers and users, it was decided to review, complete and reorganize the
122 relevant IEC standards and to create a more suitable, effective and comprehensive standard
123 series that provides in a systematic way all the necessary specifications and tests required for
124 different industrial and process measurement transmitters.
125 To solve the issues mentioned above and to provide an added value for the stakeholders, the
126 new standard series on industrial and process measurement transmitters covers the following
127 main aspects:
128 • applicable normative references;
129 • specific terms and definitions;
130 • typical configurations and architectures for the various types of industrial and process
131 measurement transmitters;
132 • hardware and software aspects;
133 • interfaces (to the process, to the operator, to the other measurement and control devices);
134 • physical, mechanical and electrical requirements and relevant tests; clear definition of the
135 test categories: type tests, acceptance tests and routine tests;
136 • performance (its specification, tests and verification);
137 • environmental protection, hazardous areas application, functional safety, etc.;
138 • structure of the technical documentation.
139 To cover in a systematic way all the topics to be addressed, the standard series is organized in
140 several parts. At the moment of the publication of this document, the IEC 62828 series consists
141 of the following parts:
142 • IEC 62828-1: General procedures for all types of transmitters
143 • IEC 62828-2: Specific procedures for pressure transmitters
144 • IEC 62828-3: Specific procedures for temperature transmitters
145 • IEC 62828-4: Specific procedures for level transmitters
146 • IEC 62828-5: Specific procedures for flow transmitters
147 In preparing IEC 62828 (all parts), many test procedures were taken, with the necessary
148 improvements, from IEC 61298 (all parts). As IEC 61298 (all parts) is currently applicable to all
149 process measurement and control devices, when IEC 62828 (all parts) is completed, IEC 61298
150 (all parts) will be revised to harmonise it with IEC 62828 (all parts), taking out from its scope
151 the industrial and process measurement transmitters. During the time when the scope of
152 IEC 61298 (all parts) is being updated, the new IEC 62828 series takes precedence for
153 industrial and process measurement transmitters.
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156 REFERENCE CONDITIONS AND PROCEDURES FOR TESTING INDUSTRIAL
157 AND PROCESS MEASUREMENT TRANSMITTERS –
159 Part 2: Specific procedures for pressure transmitters
163 1 Scope
164 This part of IEC 62828 establishes specific procedures for testing pressure process
165 measurement transmitters (PMT) used in measuring and control systems for industrial
166 processes and for machinery.
167 A pressure PMT can feature a remote seal to bring the process variable to the sensing element
168 in the PMT. When the remote seal cannot be separated from the PMT, the complete device is
169 tested.
170 For general test procedures, reference is made to IEC 62828-1, which is applicable to all types
171 of process measurement transmitters.
172 NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also
173 to use the terms "industrial transmitters", or "process transmitters".
174 2 Normative references
175 The following documents are referred to in the text in such a way that some or all of their content
176 constitutes requirements of this document. For dated references, only the edition cited applies.
177 For undated references, the latest edition of the referenced document (including any
178 amendments) applies.
179 IEC 62828-1, Reference conditions and procedures for testing industrial and process
180 measurement transmitters – Part 1: General procedures for all types of transmitters
181 3 Terms and definitions
182 For the purposes of this document, the terms and definitions given in IEC 62828-1 and the
183 following apply.
184 ISO and IEC maintain terminological databases for use in standardization at the following
185 addresses:
186 • IEC Electropedia: available at http://www.electropedia.org/
187 • ISO Online browsing platform: available at http://www.iso.org/obp
189 In addition, the following standards, specific for pressure PMTs, also apply:
190 • IEC 61518:2000, Mating dimensions between differential pressure (type) measuring
191 instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa)
193 3.1
194 absolute pressure
195 p
abs
196 pressure using absolute vacuum as the datum point
197 Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABB181.

IEC 62828-2 Ed.2 CD  IEC 202x – 7 –
198 3.2
199 ambient atmospheric pressure
200 p
amb
201 pressure exerted by the atmospheric air at a given altitude and temperature
202 Note 1 to entry: The atmospheric pressure decreases with the altitude by about 10 Pa/m (Pascal per metre).
203 3.3
204 differential pressure
205 ∆p
206 p
1,2
207 difference between the two (absolute) pressures that act simultaneously on opposite sides of a
208 membrane or a primary element
209 Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABB995.
210 3.4
211 gauge pressure
212 p
g
213 pressure using atmospheric pressure as the datum point
214 p = p – p
g abs amb
215 Note 1 to entry: Gauge pressure assumes positive values when the absolute pressure is greater than the ambient
216 atmospheric pressure; it assumes negative values when the absolute pressure is less than the ambient atmospheric
217 pressure.
218 Note 2 to entry: In certain industrial environments, "gauge pressure" may be referred to as "pressure".
219 Note 3 to entry: The term "relative pressure" to indicate gauge pressure is obsolete and conceptually wrong, so it
220 should be avoided.
221 Note 4 to entry: the CDD code of this entry for Electronic Data Exchange is ABB182.
222 3.5
223 line pressure
224 static pressure
225 pressure applied on both sides of a differential pressure PMT
226 Note 1 to entry: For differential pressure PMTs, it is an influence factor that is bilateral and does not represent the
227 measurand.
228 3.6
229 leakage rate
230 leakage, permeation and/or diffusion effects of the medium through the PMT and/or its mounting
231 devices over the testing period under static pressure conditions, expressed as normal volume
232 flow rate
233 Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABD632.
234 3.7
235 measuring range
236 range related to the measurement of absolute and gauge pressure PMTs
237 Note 1 to entry: For a pressure PMT with variable (adjustable or programmable) span, the measuring range and
238 associated terms are shown in Figure 1.
239 Note 2 to entry: See also Annex K in IEC 62828-1 for an example of signal current range of a 4 mA to 20 mA PMT
240 Note 3 to entry: maximum span indicates the measuring range defined by the difference between the upper and lower
241 range limit
242 .
243 3.8
244 set span
245 difference between the upper and lower range value of pressure to which a pressure
246 measurement instrument is adjusted

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247 Note 14 to entry: The CDD code of this entry for Electronic Data Exchange is ABB570
Maximum Working
Vacuum Burst pressure
Pressure (MWP)
Zero
MPa
Minimum pressure limit Lower range Upper range
Overpressure limit
Lower limiting value limit (LRL) limit (URL)
Upper limiting value
of process pressure
Set span
of process pressure (OPL)
Lower range value (LRV)
Upper range value (URV)
Measuring range
(maximum span)
IEC
254 Figure 1 – Measuring range and associated properties of a pressure PMT
255 3.9
256 Maximum Working Pressure (MWP)
257 The highest pressure a device can be continuously exposed to during operation
258 Note "Maximum working pressure (MWP) is equal to the upper range limit (URL), if not otherwise specified by the
259 manufacturer."
260 3.10
261 overpressure limit (OPL)
262 proof pressure
263 multiple of Maximum Working Pressure with which the device may be temporarily subjected to
264 pressure without permanent damage and without change of the guaranteed metrological properties
265 after returning to the measuring range
266 Note 1 to entry: The output signal at the overpressure limit is sometimes unreliable and/or not predictable.
267 Note 2 to entry: After returning to the measuring range, the guaranteed metrological properties shall remain
268 unchanged.
269 Note 3 to entry: The CDD code of this entry for Electronic Data Exchange is ABC027.
271 3.11
272 minimum pressure limit
273 pressure specified by the manufacturer the device may be subjected without permanent damage
274 and without change of the guaranteed metrological properties after returning to the measuring range
276 3.12
277 pressure
278 force per unit area applied in a direction perpendicular to a surface
279 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
280 kg·m ·s ).
IEC 62828-2 Ed.2 CD  IEC 202x – 9 –
281 Note 2 to entry: In Annex A, a table shows the relationship between the SI unit and other units, often used for
282 process measurement transmitter applications.
283 Note 3 to entry: For the purpose of this document, a simplified definition could be accepted as follows: "Ratio of
284 orthogonal component of the force per unit area to that unit area".
285 3.13
286 fixed-scale pressure transmitter
287 Pressure transmitter with fixed measuring range set by the manufacturer
289 3.14
290 variable scale pressure transmitter
291 pressure transmitter with an adjustable measuring range (turn-down ratio)
293 3.15
294 burst pressure
295 Maximum pressure that can be applied to the instrument without physically damaging the
296 internal sensing component and potentially compromising device integrity
298 Note: Above the burst pressure the device function and integrity is no longer guaranteed
300 3.16
301 vacuum
302 State of a fluid whose pressure is less than atmospheric pressure
304 3.17
305 diaphragm seal
306 remote seal
307 functional component that transfers the pressure to be measured to the PMT by hydraulic path
308 and decouples the PMT from influence factors stemming from the process
309 Note 1 to entry: A remote seal is connected to the transmitter by a capillary; the diaphragm seal is usually an
310 integral part of the transmitter.
311 Note 2 to entry: The primary purpose of using diaphragm/remote seals is to protect the sensing element against
312 high process temperatures or aggressive media.
313 Note 3 to entry: A diaphragm made of suitable material is responsible for the separation of the measured
314 fluids/gases and transmitter. A fluid adapted to the measurement task is responsible for the transfer of the pressure
315 to the measuring element.
316 Note 4 to entry: The diaphragm seal is included in the treatment of the total measurement error (e.g. temperature
317 influence, step response time, vacuum stability, etc.).
319 3.18
320 manifold
321 pipe fitting or similar device, such as a f
...