SIST EN 1854:2010

SLOVENSKI STANDARD
oSIST prEN 1854:2008
01-november-2008
7ODþQD]D]QDYDOD]DSOLQVNHJRULOQLNHLQSOLQVNHDSDUDWH
Pressure sensing devices for gas burners and gas burning appliances
Ta slovenski standard je istoveten z: prEN 1854
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
oSIST prEN 1854:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1854:2008

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oSIST prEN 1854:2008
EUROPEAN STANDARD
DRAFT
prEN 1854
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2008
ICS 23.060.40 Will supersede EN 1854:2006
English Version
Pressure sensing devices for gas burners and gas burning
appliances
Dispositifs de surveillance de pression pour brûleurs à gaz
et appareils à gaz
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 58.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1854:2008: E
worldwide for CEN national Members.

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Contents Page
1 Scope. 4
2 Normative references . 4
3 Terms and definitions. 4
4 Classification. 11
5 Units of measurement and test conditions . 12
6 Construction requirements. 12
7 Performance . 18
8 EMC/Electrical requirements . 28
9 Marking, installation and operating instructions. 31
Annex A (informative) Gas connections in common use in the various countries . 33
Annex B (informative) Leak-tightness test – volumetric method . 34
Annex C (informative) Leak-tightness test – pressure loss method. 35
Annex D (informative) Conversion of pressure loss into leakage rate . 36
Annex E (normative) Electrical/electronic component fault modes. 37
Annex F (normative) Additional requirements for safety accessories and pressure accessories as
defined in EU Directive 97/23/EC. 38
Annex G (normative) Materials for pressurized parts. 39
Annex H (informative) Additional materials for pressurized parts. 40
Annex I (normative) Requirements for controls used in DC supplied gas burners and gas burning
appliances. 41
Annex J (informative) Manufacturers declaration for EPSDs . 42
Annex ZA (informative) Clauses of this European Standard addressing requirements or provisions
of EU-Directives . 43

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Foreword
This document (prEN 1854:2008) has been prepared by Technical Committee CEN/TC 58 “Safety and control
devices for gas-burners and gas-burning appliances”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1854:2006.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(s), see informative Annex ZA, B, C, D, H and J which is an integral part of
this document.
For this draft European Standard a transition period of 2 years is proposed.
During the public enquiry stage the this document refers to some IEC standards. These IEC standards are in
the process to become European standards. It is the intention of the responsible working group to update the
IEC references to the related EN references before the revised standard is launched for formal vote.
It is essential that this document is used in conjunction with EN 13611:2007. This document refers to clauses of
EN 13611:2007 or adapting it by stating “Addition”, “Modification” or “Replacement” in the corresponding
clause. This European Standard adds clauses or sub clauses to the structure of EN 13611:2007 (e. g. clause
3.35 and 6.4.9). Note that these clauses or not indicated as an addition.
Note that the following provides details of significant technical changes between this European Standard and
the previous edition:
a) incorporation of the requirements and tests for electronic pressure sensing devices (EPSDs);
b) alignment with EN 13611:2007;
c) updating of definitions and normative references.
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1 Scope
This European Standard specifies the safety, construction and performance requirements for pressure sensing
devices.
This European Standard covers type testing only.
It applies to pressure sensing devices for the control of pressures of combustible gases of the first, second and
third families, air, combustion products and mixtures thereof for maximum inlet pressures up to 5 bar.
It applies to all types of pressure sensing devices, including electronic, differential and inferential types.
It specifies requirements for pressure sensing devices which are intended to be applied for steam boilers and
which needs to meet increased reliability requirements as such. These devices are classified as PSD-S in this
document.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 13611:2007, Safety and control devices for gas burners and gas-burning appliances — General
requirements
EN 60529, Degrees of protection provided by enclosures (IP code)
EN 61058-1, Switches for appliances — Part 1: General requirements
EN 175301-803, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness, locking screw
not detachable
EN ISO 75 (all parts), Plastics — Determination of temperature of deflection under load
IEC 60730-1:2007, Automatic electrical controls for household and similar use - Part 1: General requirements
IEC 60730-2-6:2007, Automatic electrical controls for household and similar use — Part 2-6: Particular
requirements for automatic electrical pressure sensing controls including mechanical requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
control
[EN 13611:2007, 3.1]
3.2
control function
[EN 13611:2007, 3.2]
3.3
closure member
[EN 13611:2007, 3.3]
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3.4
external leak-tightness
[EN 13611:2007, 3.4]
3.5
internal leak-tightness
[EN 13611:2007, 3.5]
3.6
inlet pressure
[EN 13611:2007, 3.6]
3.7
outlet pressure
[EN 13611:2007, 3.7]
3.8
pressure difference
[EN 13611:2007, 3.8]
3.9
maximum inlet pressure
[EN 13611:2007, 3.9]
3.10
minimum inlet pressure
[EN 13611:2007, 3.10]
3.11
flow rate
[EN 13611:2007, 3.11]
3.12
rated flow rate
[EN 13611:2007, 3.12]
3.13
maximum ambient temperature
[EN 13611:2007, 3.13]
3.14
minimum ambient temperature
[EN 13611:2007, 3.14]
3.15
mounting position
[EN 13611:2007, 3.15]
3.16
nominal size
DN
[EN 13611:2007, 3.16]
3.17
apparatus
[EN 13611:2007, 3.17]
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3.18
system
[EN 13611:2007, 3.18]
3.19
installation
[EN 13611:2007, 3.19]
3.20
fault tolerating time
[EN 13611:2007, 3.20]
3.21
fault reaction time
[EN 13611:2007, 3.21]
3.22
normal operation
[EN 13611:2007, 3.22]
3.23
defined state
[EN 13611:2007, 3.23]
3.24
complex electronics
[EN 13611:2007, 3.24]
3.25
reset
[EN 13611:2007, 3.25]
3.26
failure
[EN 13611:2007, 3.26]
3.27
degradation
[EN 13611:2007, 3.27]
3.28
fault
[EN 13611:2007, 3.28]
3.29
harm
[EN 13611:2007, 3.29]
3.30
hazard
[EN 13611:2007, 3.30]
3.31
risk
[EN 13611:2007, 3.31]
3.32
functional safety
[EN 13611:2007, 3.32]
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3.33
program
[EN 13611:2007, 3.33]
3.34
breather hole
[EN 13611:2007, 3.34]
3.35
pressure sensing device
PSD
device which senses pressure and provides a signal
NOTE Different types of PSDs are given in Figures 1 to 3.


Key Key Key
1 sensing element 1 sensing element 1 sensing element
2 Inlet 1

3 Inlet 2/reference

Figure 1 — Differential (E)PSD Figure 2 — Atmospheric Figure 3 — Absolute (E)PSD
(E)PSD

3.36
set point
pressure to which the PSD is adjusted to operate or to switch
3.37
switching pressure
inlet pressure at which the PSD operates or switches
3.38
set point range
declared range of adjustment of the PSD between the highest and lowest set points
3.39
upper switching pressure
pressure at which the PSD operates or switches during an increase in pressure
3.40
lower switching pressure
pressure at which the PSD operates or switches during a decrease in pressure
3.41
electronic pressure sensing device
EPSD
electronic based pressure sensing element and a signal conditioner.
NOTE Figure 4, clarifies the EPSD

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Figure 4 — EPSD
3.42
electronic pressure sensing element
part of the EPSD, which transforms the signal to be sensed (e.g. pressure) to another physical value (e.g.
force, voltage, etc.)
3.43
signal conditioner
transforms the signal from the sensing element into the output signal of the EPSD
NOTE The signal conditioner may consist functional electronics as well as electronics which makes the sensor output
to be classified as class B or C in accordance with EN 13611:2007
3.44
response time
time counted from start of the step change input signal (e.g. pressure) until the output signal (e.g. voltage,
current) is in the settling tolerance for the first time
NOTE For further information refer to figure 5.
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Key
1 step function 5 steady state value
2 step response 6 response time
7 settling time
3 overshoot value

4 settling tolerance
Figure 5 — Step response of a transfer element
3.45
step response
output signal change of a device having a step change input signal
3.46
steady state value
value of the output signal after step response input remains constant.
3.47
settling tolerance
difference between the current output signal and its steady state value declared by the manufacturer.
3.48
settling time
time counted from start of the step change input signal until the output signal remains in the settling tolerance.
3.49
overshoot value
biggest deviation between the output signal and its steady state value after step change of the inlet signal
exceeding the settling tolerance for the first time.
3.50
withstand pressure
pressure that is withstood without degraded performance after returning below the maximum inlet pressure
3.51
deviation
difference between the declared or indicated set point and the pressure measured before the endurance test
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3.52
drift
difference between the switching pressures, or in case of EPSD the positive or negative shift of the sensor
characteristic measured before and after the endurance test
NOTE For illustration refer to figure J.1.
3.53
repeatability
ability of a system to provide similar output for repeated operation
3.54
hysteresis
greatest differences between the upscale and downscale output readings or upper and lower switching
pressure at one point
NOTE Clarification of the hysteresis in reference to other definitions of PSDs is given in figure 6 and 7.
Key
1 minimum inlet pressure
2 maximum inlet pressure
3 withstand pressure
4 set point
5 switching point (before endurance)
6 switching point (after endurance)
7 deviation
8 drift
9 hysteresis
10 lowest set point
11 highest set point
12 set point range
x P-Inlet/P-Differential

Figure 6 — Clarification of definitions for PSD-M and PSD-S

Key
1 hysteresis
2 maximum inlet pressure
3 withstand pressure
x P-Inlet/P-Differential
y output

Figure 7 — Clarification of definitions for EPSD
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3.55
transfer ratio
positive or negative rotation of the sensor characteristic with the intersection of the characteristic and the x-axis
as point of rotation

NOTE For illustration refer to figure J.1.
3.56
linearity
linearity is the worst case deviation of straightness of the actual transfer function from the ideal straight line
NOTE For illustration refer to figure J.1.
3.57
offset
positive or negative deviation of the intersection of the sensor characteristic and the y-axis
NOTE For illustration refer to figure J.1
3.58
resolution
minimum incremental input or output change area
4 Classification
4.1 Classes of control
According to EN 13611:2007, 4.1.
Replacement:
Pressure sensing devices (PSDs) can be classified as:
 PSD-M, being a mechanical pressure sensing device;
 PSD-S, being a PSD-M meeting increased requirements;
 EPSD, being an electronic pressure sensing device, including devices with variable output.
4.2 Groups of control
According to EN 13611:2007, 4.2.
Modification:
Group 2 is not applicable for PSDs.
4.3 Classes of control functions
According to EN 13611:2007, 4.3.
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5 Units of measurement and test conditions
According to EN 13611:2007, Clause 5.
6 Construction requirements
6.1 General
According to EN 13611:2007, 6.1.
Addition:

Clause 6 is applicable for PSD-M, PSD-S and EPSDs unless stated otherwise.
A method for the assessment of EPSDs is defined in clause 6. The manufacturer shall declare the class of
control function according to the intended application.
For EPSD technologies not specified in this standard, a safety analysis shall be performed to describe the
specific failure modes, requirements and tests for the type of technology in addition to the relevant
requirements in this standard. This safety analysis can result in additional constructional requirements and/or
additional failure modes to be included into the fault assessment. Together with the relevant requirements of
this standard, this is a set of conditions under which the new technology can be used in an EPSD.
NOTE In general the basic risk of fire and/or explosion as a result of uncontrolled gas or air pressures and gas/air
ratios is considered as a class C risk.
The withstand pressure shall be declared by the manufacturer. The withstand pressure can be equal to
maximum inlet pressure. At the withstand pressure, devices shall comply with the requirements of this standard
with the exception of sub clause 7.11.
The declared pressures can be positive or negative pressures.
6.2 Mechanical parts of the control
6.2.1 Appearance
According to EN 13611:2007, 6.2.1.
6.2.2 Holes
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.2.2.
6.2.3 Breather holes
According to EN 13611:2007, 6.2.3.
Modification:
Use the withstand pressure instead of the maximum inlet pressure.

Addition:

Alternatively, when the requirement of 6.3.2 c) is fulfilled, no further requirements apply for breather holes.
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6.2.4 Test for leakage of breather holes
According to EN 13611:2007, 6.2.4.
6.2.5 Screwed fastenings
According to EN 13611:2007, 6.2.5.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.2.5.
6.2.6 Jointing
According to EN 13611:2007, 6.2.6.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.2.6.
6.2.7 Moving parts
According to EN 13611:2007, 6.2.7.
6.2.8 Sealing caps
According to EN 13611:2007, 6.2.8.
6.2.9 Dismantling and reassembly
According to EN 13611:2007, 6.2.9.
Addition:
The second and the third paragraph of EN 13611:2007 6.2.9 are only applicable for devices for combustible
gas.
6.2.10 Internal diameter of orifices of pressure transmission compartments
Orifices of all compartments used for pressure transmission shall have a minimum internal diameter of 0,7 mm,
except in cases where a smaller orifice is protected against fouling and clogging by suitable measures, e. g.
external filters (see 9.2 h)).
6.2.11 Manual reset
PSDs with manual reset shall function by an action that is independent of manipulation or position of the reset
member. Reset shall be manual.
NOTE Manual reset may require the use of a tool.
6.2.12 Sensed medium
The manufacturer shall declare the nature of the sensed medium for which the device is designed.
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6.2.13 PSD-S
The construction requirements for PSD-S shall be as follows:
a) switching parts shall have the characteristics of a snap-acting contact as defined in IEC 60730-1 and EN
61058-1;
b) PSD-S shall not use reed relays or reed contacts;
c) pressure-stressed measurement parts shall be manufactured from corrosion resistant materials;
d) maximum declared ambient temperature shall be ≥ 70 °C;
e) PSD-S shall, as a minimum, meet the requirements of EN 60529, IP44.
6.3 Materials
6.3.1 General material requirements
According to EN 13611:2007, 6.3.1.
6.3.2 Housing
According to EN 13611:2007, 6.3.2.
Replacement:
Parts of the housing of devices for combustible gas which directly or indirectly separate a gas-carrying
compartment from atmosphere shall either:
a) be made from metallic materials; or
b) on removal or fracture of non-metallic parts other than O-rings, gaskets and sealing parts of diaphragms,
no more than 70 dm³/h of air escapes at the withstand pressure; or
c) be constructed for a withstand pressure up to and including 60 kPa (600 mbar) using non-metallic materials
provided that:
 these gas carrying compartments are protected from the gas supply by a metallically housed metallic flow
restrictor of less than 1 mm diameter; and
3 nd
 a leakage rate of 70 dm /h of air is not exceeded after the test described in 6.3.3, 2 paragraph.
When inside a housing a diaphragm separates the gas-carrying compartment from atmosphere than this is
considered to be indirectly separated.
6.3.3 Test for leakage of housing after removal of non-metallic parts
According to EN 13611:2007, 6.3.3.
Replacement:
For indent b) of 6.3.2:
Remove all non-metallic parts of the housing which separate a gas-carrying compartment from atmosphere,
excluding O-rings, gaskets, and sealing part of diaphragms. Pressurize the pressure ports of the PSD to the
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withstand pressure or 1,5 times the maximum inlet pressure whichever is greater, and measure the leakage
rate according to 7.3.1.
For indent c) of 6.3.2:
Store the PSD for 1 h at 135 ± 2 °C ambient temperature, apply directly after that a pressure of three times the
withstand pressure to the gas pressure sensitive parts of the compartment made with non-metallic material for
5 min. Wait for the PSD is returned to room temperature. Pressurize the pressure ports of the PSD to the
withstand pressure or 1,5 times the maximum inlet pressure whichever is greater, and measure the leakage
rate according to 7.3.1.
6.3.4 Zinc alloys
According to EN 13611:2007, 6.3.4.
6.3.5 Springs providing closing and/or sealing force
EN 13611:2007, 6.3.5 is not applicable.
6.3.6 Resistance to corrosion and surface protection
According to EN 13611:2007, 6.3.6.
6.3.7 Impregnation
According to EN 13611:2007, 6.3.7.
6.3.8 Seals for glands for moving parts
According to EN 13611:2007, 6.3.8.
6.3.9 Plastics materials
Where plastics materials are used, they shall have a declared heat deflection temperature (°C) of not less than
1,2 times the maximum declared ambient temperature when measured in accordance with EN ISO 75 (Method
A, 1.8 MPa load) and by reference to the plastics manufacturer’s data.
6.4 Gas connections
6.4.1 Making connections
According to EN 13611:2007, 6.4.1.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.4.1.
6.4.2 Connection sizes
According to EN 13611:2007, 6.4.2.
Modification:
PSDs for combustible gas using threads shall be in accordance with EN 13611:2007, 6.4.2.
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6.4.3 Threads
According to EN 13611:2007, 6.4.3.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.4.3.
6.4.4 Union joints
According to EN 13611:2007, 6.4.4.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.4.4.
6.4.5 Flanges
According to EN 13611:2007, 6.4.5.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.4.5.
6.4.6 Compression fittings
EN 13611:2007, 6.4.6 is not applicable.
6.4.7 Nipples for pressure test
According to EN 13611:2007, 6.4.7.
Modification:
PSDs for combustible gas shall be in accordance with EN 13611:2007, 6.4.7.
6.4.8 Strainers
EN 13611:2007, 6.4.8 is not applicable.
6.4.9 Connections for devices specified for air and combustion products
For PSDs only suitable for air and combustion products, connections shall be as declared by the manufacturer,
however threads, flanges or compression fittings (if used) shall be in accordance with EN 13611:2007, 7.4.1
and 7.4.2. Push-fit connections shall not be used for PSDs for maximum inlet pressures greater than 500 mbar
(50 kPa).
6.5 Electronic parts of the control
6.5.1 General
According to EN 13611:2007, 6.5.1.
Modification:

th
EN 13611:2007, 6.5.1, 4 paragraph and Note are not applicable.
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6.5.2 Protection provided by the enclosure
According to EN 13611:2007, 6.5.2.
6.5.3 Electrical components
According to EN 13611:2007, 6.5.3.
6.6 Protection against internal faults for the purpose of functional safety
6.6.1 Design and construction requirements
According to EN 13611:2007, 6.6.1.
Addition:
Annex E: the fault modes resulting from the safety analysis in clause 6.1 are applicable.

6.6.2 Class A
According to EN 13611:2007, 6.6.2.
6.6.3 Class B
6.6.3.1 Design and construction requirements
According to EN 13611:2007, 6.6.3.1.
6.6.3.2 First fault
According to EN 13611:2007, 6.6.3.2.
Modification:
EN 13611:2007, 6.6.3.2 c) is not applicable.
Addition:
The fault reaction time shall be declared by the manufacturer with a limit of 24 hr.
The manufacturer shall declare the output signal(s) representing the defined state(s). As the defined state(s),
specified in EN 13611:2007, 6.6.3.2 a), b) and d) are applicable for the total function (i. e. EPSD and central
unit), the EPSD manufacturer shall specify the defined state in analogy with the requirements in
EN 13611:2007, 6.6.3.2 a), b) and d).
If EN 13611: 2007, 6.6.3.2 d) applies (continues to operate) the EPSD shall remain to function in accordance
with the performance requirements as specified in clause 7, especially with clause 7.11.2.
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6.6.3.3 Fault introduced during lock-out or safety- shut-down
According to EN 13611:2007, 6.6.3.3.
6.6.4 Class C
6.6.4.1 Design and construction requirements
According to EN 13611:2007, 6.6.4.1.
6.6.4.2 First fault
According to EN 13611:2007, 6.6.4.2.
Modification:
EN 13611:2007, 6.6.4.2 c) is not applicable.
Additions:
The fault reaction time shall be declared by the manufacturer.
The manufacturer shall declare the output signal(s) representing the defined state(s). As the defined state(s),
specified in EN 13611:2007, 6.6.4.2 a), b) and d) are applicable for the total function (i. e. EPSD and central
unit), the EPSD manufacturer shall specify the defined state in analogy with the requirements in EN
13611:2007, 6.6.4.2 a), b) and d).
If EN 13611: 2007, 6.6.4.2 d) applies (continues to operate) the EPSD shall remain to function in accordance
with the performance requirements as specified in clause 7, especially with clause 7.11.2.
6.6.4.3 Fault introduced during lock-out or safety- shut-down
According to EN 13611:2007, 6.6.4.3.
Modification:
EN 13611:2007, 6.6.4.3 a) is not applicable.
6.6.5 Circuit and construction evaluation
According to EN 13611:2007, 6.6.5.
7 Performance
7.1 General
According to EN 13611:2007, 7.1.
Addition:
The manufacturer shall declare all mounting positions for which any scale provided is valid, giving any
appropriate correction factors.
The minimum inlet pressure and the maximum inlet pressure shall be declared by the manufacturer.
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After the PSD was exposed to the withstand pressure, the PSD shall comply with 7.11.
The functionality of the PSD shall be declared by the manufacturer from the minimum inlet pressure upto the
maximum inlet pressure. The total accuracy of EPSD shall be declared by the manufacturer from the minimum
inlet pressure upto the maximum inlet pressure in accordance of sub clause 7.11.2.1.
EPSDs, shall operate correctly from the minimum rated voltage to the maximum rated voltage, including the
tolerances, as declared by the manufacturer.
For AC line voltage a tolerance of 15 % to the minimum and 10% the maximum rated voltage applies. For AC
supplies of other types the tolerance shall be declared by the manufacturer.
For DC supplies type A, B and C according to I.1 of EN 13611:2007 a tolerance of 20 % to the minimum and
the maximum rated voltage applies. For DC supplies of other types the tolerance shall be declared by the
manufacturer.
The tolerances related to the power supply shall be applied during the test as laid down in this standard.
7.2 Leak-tightness
According to EN 13611:2007, 7.2.
Modification:
Internal leakage is not applicable for PSDs.
Addition:
PSDs for use with air and combustion products Table 1 is applicable.
In addition for PSD-S the external leakage rates shall, when checked after the test given i
...