prEN 1854
(Main)Safety and control devices for burners and appliances burning gaseous and/or liquid fuels — Pressure sensing devices for gas burners and gas burning appliances
Safety and control devices for burners and appliances burning gaseous and/or liquid fuels — Pressure sensing devices for gas burners and gas burning appliances
This European Standard specifies the safety, design, construction, and performance requirements and testing of pressure sensing devices for burners and appliances burning one or more gaseous fuels.
It applies to pressure sensing devices for the measurement of pressures of gases according to EN 437 or air or combustion products for maximum inlet pressures up to 500 kPa (5 bar).
It applies to all types of pressure sensing devices, including electronic, differential and inferential types.
It also specifies requirements for pressure sensing devices which are intended to be applied to steam boilers and as such need to meet increased reliability requirements. These devices are classified as PSD-S in this European Standard.
Sicherheits - und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige und/oder flüssige Brennstoffe - Druckwächter für Gasbrenner und Gasgeräte
EN 13611:2019 wird durch Folgendes ersetzt:
Dieses Dokument legt die Sicherheits-, Konstruktions- und Funktionsanforderungen sowie die Prüfung für Druckwächter für Brenner und Brennstoffgeräte für einen oder mehrere gasförmige(n) Brennstoff(e) fest.
Es gilt für Druckwächter zur Messung der Drücke von Gasen nach EN 437 oder Luft und Verbrennungsprodukte für maximale Eingangsdrücke bis 500 kPa (5 bar).
Sie gilt für alle Arten von Druckwächtern, einschließlich elektronischer Ausführungen sowie für Differenzdruckwächter und indirekt messende Typen.
Es werden auch Anforderungen an Druckwächter festgelegt, die für den Einsatz an Dampfkesseln vorgesehen sind und die erhöhte Anforderungen an die Zuverlässigkeit erfüllen müssen. Diese Druckwächter werden im vorliegenden Dokument als PSD-S klassifiziert.
Equipements auxiliaires pour brûleurs et appareils utilisant des combustibles gazeux ou liquides - Dispositifs de surveillance de pression pour brûleurs à gaz et appareils à gaz
La norme EN13611 :2019 est remplacée par ce qui suit:
Ce document spécifie les exigences de sécurité, de construction, de fonctionnement et les méthodes d'essais
des dispositifs de surveillance de pression des brûleurs et des appareils à gaz.
Elle s’applique aux dispositifs de surveillance de pression pour le contrôle des pressions de gaz combustibles
selon la norme EN437 ainsi que le contrôle des pressions d'air et de gaz de combustion pour des pressions
amont maximales allant jusqu’à 500 kPa (5 bar).
Elle s’applique à tous les types de dispositifs de surveillance de pression, y compris électroniques,
différentiels et inférentiels.
Elle spécifie également les exigences des dispositifs de surveillance de pression qui sont destinés à être
utilisés dans des chaudières à vapeur et qui, en tant que tels, doivent respecter des exigences de fiabilité plus
strictes. Ces dispositifs appartiennent à la catégorie des pressostats de classe « S » dans le présent
document.
Varnostne in nadzorne naprave za gorilnike in aparate na plin in/ali tekoča goriva - Tlačna zaznavala za plinske gorilnike in plinske aparate
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN 1854:2020
01-oktober-2020
Varnostne in nadzorne naprave za gorilnike in aparate na plin in/ali tekoča goriva -
Tlačna zaznavala za plinske gorilnike in plinske aparateSafety and control devices for burners and appliances burning gaseous and/or liquid
fuels - Pressure sensing devices for gas burners and gas burning appliancesTa slovenski standard je istoveten z: prEN 1854
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 1854:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 1854:2020
DRAFT
EUROPEAN STANDARD
prEN 1854
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 23.060.40 Will supersede EN 1854:2010
English Version
Safety and control devices for burners and appliances
burning gaseous and/or liquid fuels - Pressure sensing
devices for gas burners and gas burning appliances
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-CENELEC
Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey 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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1854:2020 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
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EN 1854:2019 (E)
Contents Page
European foreword ....................................................................................................................................................... 3
1 Scope .................................................................................................................................................................... 4
2 Normative references .................................................................................................................................... 4
3 Terms and definitions ................................................................................................................................... 5
4 Classification .................................................................................................................................................. 11
5 Test conditions and uncertainty of measurements ......................................................................... 11
6 Design and construction ............................................................................................................................ 11
7 Performance .................................................................................................................................................. 18
8 Electrical requirements ............................................................................................................................. 29
9 Electromagnetic compatibility (EMC) ................................................................................................... 30
10 Marking, instructions ................................................................................................................................. 32
Annex A (informative) Abbreviations and Symbols ....................................................................................... 34
Annex B (informative) Leak-tightness test for gas controls – volumetric method .............................. 35
Annex C (informative) Leak-tightness test for gas controls – pressure loss method ......................... 36
Annex D (normative) Calculation of pressure loss into leakage rate ....................................................... 37
Annex E (normative) Electrical/electronic component fault modes ........................................................ 38
Annex F (normative) Additional requirements for safety accessories and pressureaccessories as defined in EU Directive 2014/68/EU ....................................................................... 39
Annex G (normative) Materials for pressurized parts................................................................................... 40
Annex H (normative) Additional materials for pressurized parts ............................................................ 41
Annex I (normative) Requirements for controls used in DC supplied gas burners and
appliances burning gaseous or liquid fuels ........................................................................................ 42
Annex J (normative) Method for determination of a Safety integrity level (SIL) ................................. 43
Annex K (normative) Method for the determination of a Performance Level (PL) ............................ 44
Annex L (informative) Relationship between Safety Integrity Level (SIL) and performance
Level (PL) ........................................................................................................................................................ 45
Annex M (normative) Reset functions ................................................................................................................. 46
Annex N (informative) Guidance document on Environmental Aspects ................................................. 47
Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ....................................... 48
Annex AA (informative) Declaration for EPSDs................................................................................................ 49
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2009/142/EC aimed to be covered ............................................ 50
Annex ZB (informative) Relationship between this European Standard and the essential
requirements of regulation (EU) 2016/426 aimed to be covered ............................................. 51
Bibliography ................................................................................................................................................................. 54
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European foreword
This document (prEN 1854:2020) has been prepared by Technical Committee CEN/TC 58 “Safety and
control devices for burners and appliances burning gaseous or liquid fuels”, the secretariat of which is
held by BSI.This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1854:2010.
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 EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZB, which are an integral part of this
document.This document refers to clauses of EN 13611:2019 or adapts it by stating “with the following
modification”, “with the following addition”, “is replaced by the following” or “is not applicable” in the
corresponding clause. This document adds clauses or subclauses to the structure of EN 13611:2019
which are particular to this document. It should be noted that these clauses and subclauses are not
indicated as an addition.It should be noted that the following significant technical changes compared to the previous edition
have been incorporated in this revised document:a) the scope introduces a new declaration concerning the maximum inlet pressure covered by the
revised standard;b) incorporation of the requirements and tests for electronic pressure sensing devices (EPSDs);
c) alignment with EN 13611:2019d) updating of definitions and normative references.
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1 Scope
EN 13611:2019 is replaced by the following:
This document specifies the safety, design, construction, and performance requirements and testing of
pressure sensing devices for burners and appliances burning one or more gaseous fuels.
It applies to pressure sensing devices for the measurement of pressures of gases according to EN 437 or
air or combustion products for maximum inlet pressures up to 500 kPa (5 bar).It applies to all types of pressure sensing devices, including electronic, differential and inferential types.
It also specifies requirements for pressure sensing devices which are intended to be applied to steam
boilers and as such need to meet increased reliability requirements. These devices are classified as PSD-
S in this document.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.
EN 13611:2019, Safety and control devices for burners and appliances burning gaseous and/or liquid
fuels - General requirementsEN 60529:1991+A1:2000+A2:2013+AC:2016, Degrees of protection provided by enclosures (IP Code)(IEC
60529:1989+AMD1:1991+AMD2:2013)EN 60730-2-6:2016, Automatic electrical controls - Part 2-6: Particular requirements for automatic
electrical pressure sensing controls including mechanical requirementsEN 61058-1:2018, Switches for appliances — Part 1: General requirements (IEC 61058-1:2016)
EN 175301-803:2006, Detail Specification: Rectangular connectors - Flat contacts, 0,8 mm thickness,
locking screw not detachableEN ISO 75:2013, (all parts), Plastics — Determination of temperature of deflection under load
IEC 60730-1:2011, Automatic electrical controls for household and similar use — Part 1: General
requirements---------------------- Page: 6 ----------------------
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13611:2019 and the following
apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/• ISO Online browsing platform: available at http://www.iso.org/obp
3.101
pressure sensing device
PSD
device which senses pressure and provides a signal
Note 1 to entry: Different types of PSDs are given in Figures 1 to 3.
Key
1 sensing element
2 inlet 1
3 inlet 2/reference
Figure 1 — Differential PSD
key
1 sensing element
2 inlet 1
3 reference
Figure 2 — Atmospheric PSD
Key
1 sensing element
2 inlet 1
Figure 3 — Absolute PSD
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3.102
set point
pressure to which the PSD is adjusted to operate
3.103
switching pressure
inlet pressure at which the PSD operates
3.104
set point range
declared range of adjustment of the PSD between the highest and lowest set points
3.105upper switching pressure
pressure at which the PSD operates during an increase in pressure
3.106
lower switching pressure
pressure at which the PSD operates during a decrease in pressure
3.107
electronic pressure sensing device
EPSD
assembly of electronic based pressure sensing element and signal conditioner
NOTE Figure 4, clarifies the EPSD.
Key
1 EPSD
2 Central Unit
3 Electronic pressure sensing element
4 Signal Conditioner
5 Interface
6 Switching
Figure 4 — EPSD
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3.108
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)3.109
signal conditioner
transforms the signal from the sensing element into the output signal of the EPSD
NOTE The signal conditioner may consist of functional electronics as well as electronics which cause the
sensor output to be classified as class B or C in accordance with 4.3.3.110
response time
time counted from start of the step change input signal (e.g. pressure) until the output signal (e.g.
voltage, current) is within the settling tolerance for the first timeNOTE For further information refer to Figure 5.
Key
1 step function (y1) 5 steady-state value
2 step response (y2) 6 response time
3 overshoot value 7 settling time
4 settling tolerance t time
Figure 5 — Step response of EPSD
3.111
step response
output signal change of a device having a step change input signal
3.112
steady state value
value of the output signal after step response input remains constant
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3.113
settling tolerance
maximum difference between the current output signal and its steady-state value as stated in the
instructions3.114
settling time
time counted from start of the step change input signal until the output signal remains within the
settling tolerance3.115
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 time3.116
withstand pressure
pressure that is withstood without degraded characteristic after returning below the maximum inlet
pressureNOTE The withstand pressure can be equal to maximum inlet pressure.
3.117
deviation
difference between the declared or indicated set point and the pressure measured before the endurance
test3.118
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 testNOTE For illustration refer to Figure 7 and Figure 8.
3.119
repeatability
ability of a system to provide similar output for repeated operation
3.120
hysteresis
greatest differences between the upscale and downscale output readings or upper and lower switching
pressure at one pointNOTE Clarification of the hysteresis in reference to other definitions of PSDs is given in Figure 6, 7 and 8.
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EN 1854:2019 (E)
Key
1 minimum inlet pressure 8 drift
2 maximum inlet pressure 9 hysteresis
3 withstand pressure 10 lowest set point
4 set point 11 highest set point
5 switching pressure (before endurance) 12 set point range
6 switching pressure (after endurance) X P-inlet/P-differential
7 deviation
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 signal
Figure 7 — Clarifications of hysteresis, maximum inlet and withstand pressure
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Key
1 drift
2 transfer ratio
3 linearity
4 offset
X pressure
Y output signal
Figure 8 — Clarifications of drift, transfer ratio, linearity and offset
3.121
transfer ratio
positive or negative rotation of the sensor characteristic with the point of rotation as the intersection of
the characteristic and the x-axisNOTE For illustration refer to Figure 7 and Figure 8.
3.122
linearity
worst case deviation of straightness of the actual transfer function from the ideal straight line
NOTE For illustration refer to Figure 7 and Figure 8.3.123
offset
positive or negative deviation of the intersection of the sensor characteristic and the y-axis
NOTE For illustration refer Figure 7 and Figure 8.3.124
resolution
minimum incremental output change
3.125
safe state
state of the PSD with all output terminals deenergized or providing a signal (status) which ensures a
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4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is replaced by the following:
Pressure sensing devices (PSDs) are 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 controlShall be according to EN 13611:2019, 4.2 with the following modification:
Group 2 controls are not applicable for PSDs and/or EPSDs.
4.3 Classes of control functions
Shall be according to EN 13611:2019, 4.3. with the following addition:
— EPSDs can be only Class B or Class C control functions
— PSDs are not classified according to class A, B or C control functions.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2019, 4.4
5 Test conditions and uncertainty of measurements
5.1 Test conditions
Shall be according to EN 13611:2019, 5.1
5.2 Uncertainty of measurements
Shall be according to EN 13611:2019, 5.2
6 Design and construction
6.1 General
Shall be according to EN 13611:2019, 6.1 with the following addition:
Clause 6 is applicable for PSD-M, PSD-S and EPSDs unless stated otherwise.
The minimum inlet pressure, the maximum inlet pressure and the withstand pressure shall be declared
in the instructions. If no withstand pressure is declared, the withstand pressure is equal to the
maximum inlet pressure. At the withstand pressure, devices shall comply with the requirements of this
European Standard with the exception of 7.101.The declared pressures can be positive or negative pressures.
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6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to EN 13611:2019, 6.2.1.
6.2.2 Holes
For PSDs and/or EPSDs designed for combustible gas EN 13611:2019, 6.2.2 applies.
6.2.3 Breather holes
6.2.3.1 Requirements
For PSDs and/or EPSDs designed for combustible gas and combustion products EN 13611:2019, 6.2.3.1
applies with the following addition:The requirements of this clause are not applicable for PSDs and/or EPSDs with a maximum inlet
pressure up to and including 60 kPa (600 mbar), which fulfil the requirements of 6.3.2.1.
6.2.3.2 Test for leakage of breather holesShall be according to EN 13611:2019, 6.2.3.2 with the following modification:
Use the withstand pressure instead of the maximum inlet pressure.
6.2.4 Screwed fastenings
Shall be according to EN 13611:2019, 6.2.4 with the following modification:
This requirement only applies to PSDs and EPSDs designed for combustible gas.
6.2.5 Jointing
Shall be according to EN 13611:2019, 6.2.5 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.2.6 Moving parts
Shall be according to EN 13611:2019, 6.2.6
6.2.7 Sealing caps
Shall be according to EN 13611:2019, 6.2.7
6.2.8 Dismantling and reassembly
Shall be according to EN 13611:2019, 6.2.8
6.2.9 Auxiliary canals and orifices
Shall be according to EN 13611:2019, 6.2.9 with the following modification:
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
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6.2.10 Presetting device
Shall be according to EN 13611:2019, 6.2.10
6.2.101 Manual reset
If a manual reset function is provided the reset action shall be independent of manipulation or position
of the reset member.NOTE Manual reset can require the use of a tool.
6.2.102 Sensed medium
In the instructions shall be declared the nature of the sensed medium for which the device is designed.
6.2.103 PSD-SThe additional construction requirements for PSD-S shall be as follows:
a) switching parts shall have the characteristics of a snap-acting contact as described in
EN 61058-1:2018, 13.2 and 13.3b) reed relays or reed contacts shall not be used;
c) pressure-stressed measurement parts shall be manufactured from materials resistant to corrosion
for the intended use;d) maximum declared ambient temperature shall be ≥ 70 °C;
e) the requirements of EN 60529:1991+A1:2000+A2:2013+AC:2016, IP44 shall be met as a minimum.
6.3 Materials6.3.1 General material requirements
Shall be according to EN 13611:2019, 6.3.1.
6.3.2 Housing
6.3.2.1 Requirements
EN 13611:2018, 6.3.2.1 shall be replaced by the following:
Parts of the housing which directly or indirectly separate a gas-carrying compartment from atmosphere
shall be made from:a) metallic materials that have a melting point (solidus temperature) of at least 427 °C, or
b) metallic materials that conform to 6.3.3 orc) non-metallic materials for PSDs and/or EPSDs with a withstand pressure up to and including
60 kPa (600 mbar) provided that;1) these gas carrying compartments are protected from the gas supply by a metallically housed
metallic flow restrictor of less than 1 mm diameter; and2) a leakage rate of 70 dm /h of air is not exceeded after the test described in 6.3.2.2 b).
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For housings according to a), the external leakage after removal or fracture of non-metallic parts other
than O-rings, gaskets and sealing parts of diaphragms, shall not exceed 30 dm /h of air escaping at the
withstand pressure, when tested according to 6.3.2.2 a).NOTE When inside the housing a diaphragm separates the gas-carrying compartment from atmosphere than
this is considered to be indirectly separated.6.3.2.2 Test
EN 13611:2018, 6.2.3.2 shall be replaced by the following:
a) 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. Any breather holes shall be
blocked. Pressurize the inlet and outlet(s) of the control to the withstand pressure and measure the
leakage rate.b) For PSDs and/or EPSDs with a withstand pressure up to and including 60 kPa (600 mbar) the
following test applies:— leave the PSD and/or EPSD diaphragm as is;
— store one PSD and/or EPSD for 1 h ± 5 min at 135 °C ± 2 °C ambient temperature;
— keep the PSD and/or EPSD at this temperature and apply a pressure of three times the
withstand pressure to gas-carrying compartments for 5 min ± 10 s;— wait for the PSD and/or EPSD to return to room temperature;
— pressurize the pressure ports of the PSD and/or EPSD to the withstand pressure or 1,5 times
the maximum inlet pressure, whichever is greater;— measure the external leakage rate according to 7.2.
NOTE For the purpose of this test, the parts which provides the metallically housed metallic flow restrictor
according to 6.3.2.1 c) 2) are considered being part of the PSD and/or EPSD.6.3.3 Zinc alloys
6.3.3.1 Requirements
Shall be according to EN 13611:2019, 6.3.3.1
6.3.3.2 Test
Shall be according to EN 13611:2019, 6.3.3.2
6.3.4 Springs providing closing and/or sealing force
EN 13611:2019, 6.3.4 is not applicable.
6.3.5 Resistance to corrosion and surface protection
Shall be according to EN 13611:2019, 6.3.5
6.3.6 Impregnation
Shall be according to EN 13611:2019, 6.3.6.
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6.3.7 Seals for glands for moving parts
Shall be according to EN 13611:2019, 6.3.7.
6.3.101 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 75:2013 (all parts) (Method A, 1,8 MPa load) and by reference to the plastics’ data sheet.
6.4 Gas connections6.4.1 Making connections
Shall be according to EN 13611:2019, 6.4.1 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.2 Connection sizes
Shall be according to EN 13611:2019, 6.4.2 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.3 Threads
Shall be according to EN 13611:2019, 6.4.3 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.4 Union joints
Shall be according to EN 13611:2019, 6.4.4 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.5 Flanges
Shall be according to EN 13611:2019, 6.4.5 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.6 Compression fittings
Shall be according to EN 13611:2019, 6.4.6.
6.4.7 Nipples for pressure test
Shall be according to EN 13611:2019, 6.4.7 with the following modification:
This requirement only applies to PSDs and/or EPSDs designed for combustible gas.
6.4.8 Strainers
EN 13611:2019, 6.4.8 is replaced by the following:
There are no requirements for strainers.
6.4.101 Connections for devices specified for air and combustion products
For PSDs and/or EPSDs only suitable for air and combustion products, connections shall be as declared
in the instructions, however threads, flanges or compression fittings (if used) shall be in accordance
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with EN 13611:2019, 7.4.1 and 7.4.2. Push-fit connections shall not be used for PSDs and/or EPSDs for
maximum inlet pressures greater than 50 kPa (500 mbar).6.5 Electrical parts of the control
6.5.1 General
Shall be according to EN 13611:2019, 6.5.1 with the following addition:
Addition:
A method for the assessment of EPSDs is defined in 6.6. In the instructions shall be declared 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.6.5.2 Switching elements
EN 13611:2019, 6.5.2. is not applicable.
6.5.3 Electrical components
6.5.3.1 Performance of electrical components
Shall be according to EN 13611:2019, 6.5.3.1
6.5.3.2 Tests
Shall be according to EN 13611:2019, 6.5.3.2
6.5.3.3 Sensing elements
Shall be according to EN 13611:2019, 6.5.3.3
6.5.3.4 Gas controls employing electrical components in the gas circuit
EN 13611:2019, 6.5.3.4 is only applicable for PSDs and/or EPSDs designed for combustible gas.
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6.6 Protection against internal faults for the purpose of functional safety
6.6.1 Design and construction requirements
Shall be according to EN 13611:2019, 6.6.1. with the following addition:
Whenever the terms lock-out or safety shutdown are used within EN 13611:2019, 6.6.3 and 6.6.4, they
shall be replaced by the term safe state.6.6.2 Class A
EN 13611:2019 6.6.2 is not applicable.
6.6.3 Class B
6.6.3.1 Design and construction requirements
Shall be according to EN 13611:2019, 6.6.3.1 with the following addition:
For the purpose of the fault assessment the effect of internal failures in accordance with Annex AA shall
also be considered.6.6.3.2 First fault
Shall be according to EN 13611:2019, 6.6.3.2 with the following modification and addition:
Modification:EN 13611:2019, 6.6.3.2, c) is not applicable.
Addition:
The fault reaction time shall be declared in the instructions with a limit of 24 h.
The instructions shall provide the output signal(s) representing the safe state(s). As the requirements of
EN 13611:2019, 6.6.3...
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