Pressure sensing devices for gas burners and gas burning appliances

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 measurement of pressures of combustible gases of the first, second and third families, air, 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 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.

Druckwächter für Gasbrenner und Gasgeräte

Diese Europäische Norm legt die Anforderungen an Sicherheit, Konstruktion und Funktion von Druckwächtern fest. Diese Europäische Norm befasst sich ausschließlich mit der Typprüfung. Sie gilt für Druckwächter zur Messung der Drücke von brennbaren Gasen der ersten, zweiten oder dritten Gasfamilie, Luft und Verbrennungsprodukte für maximale Eingangsdrücke bis 500 kPa (5 bar). Sie gilt für alle Arten von Druckwächtern, einschließlich elektronischer Ausführungen sowie für Differenzdruck-wächter und indirekt messende Typen. Es werden auch Anforderungen an Druckwächter festgelegt, die für den Einsatz an Dampfkesseln vor-gesehen sind und die erhöhte Anforderungen an die Zuverlässigkeit erfüllen müssen. Diese Druckwächter werden in der vorliegenden Europäischen Norm als PSD-S klassifiziert.

Dispositifs de surveillance de pression pour brûleurs à gaz et appareils à gaz

La présente Norme européenne spécifie les exigences de sécurité, de construction et de fonctionnement des
dispositifs de surveillance de pression.
La présente Norme européenne ne couvre que les essais de type.
Elle s’applique aux dispositifs de surveillance de pression pour le contrôle des pressions de gaz combustibles
de la 1e, 2e ou 3e famille, de l’air, des produits de combustion et de leurs mélanges 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 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.

Tlačna zaznavala za plinske gorilnike in plinske aparate

Ta evropski standard določa zahteve za varnost, konstrukcijo in delovanje tlačnih zaznaval. Ta evropski standard zajema zgolj preskušanje tipov. Velja za tlačna zaznavala za merjenje tlaka vnetljivih plinov prve, druge ali tretje družine, zraka in produktov izgorevanja, za maksimalni notranji tlak do in vključno 500 kPa (5 barov). Velja za vse tipe tlačnih zaznaval, vključno z elektronskimi, diferenčnimi in inferenčnimi. Opredeljuje zahteve za tlačna zaznavala, ki so namenjena za uporabo pri parnih kotlih in morajo kot taka izpolnjevati zahteve po večji zanesljivosti. Ta zaznavala so v tem evropskem standardu klasificirana kot PSD-S.

General Information

Status
Published
Public Enquiry End Date
09-Dec-2008
Publication Date
10-Oct-2010
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
06-Oct-2010
Due Date
11-Dec-2010
Completion Date
11-Oct-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Druckwächter für Gasbrenner und GasgeräteDispositifs de surveillance de pression pour brûleurs à gaz et appareils à gazPressure sensing devices for gas burners and gas burning appliances27.060.20Plinski gorilnikiGas fuel burners23.060.40Pressure regulatorsICS:Ta slovenski standard je istoveten z:EN 1854:2010SIST EN 1854:2010en,fr,de01-november-2010SIST EN 1854:2010SLOVENSKI

STANDARDSIST EN 1854:20061DGRPHãþD
SIST EN 1854:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1854
May 2010 ICS 23.060.40 Supersedes EN 1854:2006English Version
Pressure sensing devices for gas burners and gas burning appliances
Dispositifs de surveillance de pression pour brûleurs à gaz et appareils à gaz

Druckwächter für Gasbrenner und Gasgeräte This European Standard was approved by CEN on 15 April 2010.

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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists 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, Croatia, 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.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1854:2010: ESIST EN 1854:2010

EN 1854:2010 (E) 2 Contents Page Foreword ............................................................................................................................................................. 41Scope ...................................................................................................................................................... 52Normative references ........................................................................................................................... 53Terms and definitions ........................................................................................................................... 54Classification ....................................................................................................................................... 105Units of measurement and test conditions ...................................................................................... 116Construction requirements ................................................................................................................ 117Performance ........................................................................................................................................ 178EMC/Electrical requirements ............................................................................................................. 289Marking, installation and operating instructions ............................................................................. 30Annex A (informative)

Gas connections in common use in the various countries ................................... 33Annex B (informative)

Leak-tightness test – volumetric method ................................................................ 34Annex C (informative)

Leak-tightness test – pressure loss method ........................................................... 35Annex D (informative)

Conversion of pressure loss into leakage rate ....................................................... 36Annex E (normative)

Electrical/electronic component fault modes ............................................................ 37Annex F (normative)

Additional requirements for safety accessories and pressure accessories as defined in EU Directive 97/23/EC ....................................................................................................... 38Annex G (normative)

Materials for pressurized parts ................................................................................... 39Annex H (informative)

Additional materials for pressurized parts .............................................................. 40Annex I (normative)

Requirements for controls used in DC supplied gas burners and gas burning appliances ............................................................................................................................................ 41Annex AA (informative)

Manufacturers declaration for EPSDs ................................................................... 42Annex ZA (informative)

Clauses of this European Standard addressing requirements or provisions of EU-Directives .................................................................................................................................. 43Bibliography ..................................................................................................................................................... 45 Figures Figure 1 — Differential PSD ................................................................................................................................ 6Figure 2 — Atmospheric PSD ............................................................................................................................. 6Figure 3 — Absolute PSD .................................................................................................................................... 6Figure 4 — EPSD .................................................................................................................................................. 7Figure 5 — Step response of EPSD.................................................................................................................... 8Figure 6 — Clarification of definitions for PSD-M and PSD-S ......................................................................... 9SIST EN 1854:2010

EN 1854:2010 (E) 3 Figure 7 — Clarification of definitions for EPSD ............................................................................................ 10 Tables Table 1 — Maximum external leakage rates for air/combustion products .................................................. 18Table 2 — Number of cycles PSD-M and PSD-S ............................................................................................. 27Table E.1 — Electrical/electronic component faults modes .......................................................................... 37Table AA.1 — Sensor measurement: Pressure............................................................................................... 42Table ZA.1 — Correspondence between this European Standard and Directive (Directive 2009/142/EC relating to appliances burning gaseous fuels) ........................................................................................ 43 SIST EN 1854:2010

EN 1854:2010 (E) 4 Foreword This document (EN 1854:2010) 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 European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2010, and conflicting national standards shall be withdrawn at the latest by May 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes 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 EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This European Standard refers to clauses of EN 13611:2007 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 European Standard adds clauses or subclauses to the structure of EN 13611:2007 which are particular to this European Standard. 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 European Standard: 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 13611:2007; d) updating of definitions and normative references. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 1854:2010

EN 1854:2010 (E) 5 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 measurement of pressures of combustible gases of the first, second and third families, air, 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 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. 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 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 60730-2-6:2008, Automatic electrical controls for household and similar use — Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements

(IEC 60730-2-6:2007, modified) EN 61058-1:2002, Switches for appliances — Part 1: General requirements (IEC 61058-1:2000 + A1:2001, modified) 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 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007 and the following apply. 3.101 pressure sensing device PSD device which senses pressure and provides a signal NOTE Different types of PSDs are given in Figures 1 to 3. SIST EN 1854:2010

EN 1854:2010 (E) 6
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

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 3.105 upper 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. SIST EN 1854:2010

EN 1854:2010 (E) 7

Key 1 EPSD 2 Central Unit 3 Electronic pressure sensing element 4 Signal Conditioner 5 Interface 6 Switching Figure 4 — EPSD 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 EN 13611:2007. 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 time NOTE For further information refer to Figure 5.

SIST EN 1854:2010
EN 1854:2010 (E) 8
Key 1
step function (y1) 2 step response (y2) 3 overshoot value
settling tolerance
5 steady state value
6 response time

7 settling time 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 3.113 settling tolerance difference between the current output signal and its steady state value declared by the manufacturer 3.114 settling time time counted from start of the step change input signal until the output signal remains within the settling tolerance 3.115 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 time 3.116 withstand pressure pressure that is withstood without degraded characteristic after returning below the maximum inlet pressure NOTE 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 test SIST EN 1854:2010

EN 1854:2010 (E) 9 3.118 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 test NOTE For illustration refer to Figure 7. 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 point NOTE Clarification of the hysteresis in reference to other definitions of PSDs is given in Figure 6 and 7.

Key1
minimum inlet pressure 2
maximum inlet pressure 3
withstand pressure 4
set point 5
switching pressure (before endurance) 6
switching pressure (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 SIST EN 1854:2010
EN 1854:2010 (E) 10

a) Clarifications of hysteresis, maximum inlet and withstand pressure b) Clarifications of drift, transfer ratio,linearity and offset Key 1 hysteresis 2 maximum inlet pressure 3 withstand pressure X P-inlet/P-differential Y output signal Key 1

drift 2
transfer ratio 3
linearity 4

offset X pressure Y output signal Figure 7 — Clarification of definitions for EPSD 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-axis NOTE For illustration refer to Figure 7. 3.122 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 7. 3.123 offset positive or negative deviation of the intersection of the sensor characteristic and the y-axis NOTE For illustration refer Figure 7. 3.124 resolution minimum incremental output change 4 Classification 4.1 Classes of control EN 13611:2007, 4.1 is replaced by the following: SIST EN 1854:2010

EN 1854:2010 (E) 11 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 control Shall be according to EN 13611:2007, 4.2 with the following modification: Group 2 is not applicable for PSDs. 4.3 Classes of control functions Shall be according to EN 13611:2007, 4.3. 5 Units of measurement and test conditions Shall be according to EN 13611:2007, Clause 5. 6 Construction requirements 6.1 General Shall be according to EN 13611:2007, 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 by the manufacturer. 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. 6.2 Mechanical parts of the control 6.2.1 Appearance Shall be according to EN 13611:2007, 6.2.1. 6.2.2 Holes Shall be according to EN 13611:2007, 6.2.2 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.2.3 Breather holes Shall be according to EN 13611:2007, 6.2.3 with the following modification and addition: SIST EN 1854:2010

EN 1854:2010 (E) 12 Modification: Use the withstand pressure instead of the maximum inlet pressure. Addition: Alternatively, when the requirement of 6.3.2, c) is fulfilled, the requirements of this clause are not applicable. 6.2.4 Test for leakage of breather holes Shall be according to EN 13611:2007, 6.2.4. 6.2.5 Screwed fastenings Shall be according to EN 13611:2007, 6.2.5 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.2.6 Jointing Shall be according to EN 13611:2007, 6.2.6 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.2.7 Moving parts Shall be according to EN 13611:2007, 6.2.7. 6.2.8 Sealing caps Shall be according to EN 13611:2007, 6.2.8. 6.2.9 Dismantling and reassembly Shall be according to EN 13611:2007, 6.2.9. 6.2.101 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)). 6.2.102 Manual reset If a manual reset function is provided in a PSD the reset action shall be independent of manipulation or position of the reset member. NOTE Manual reset can require the use of a tool. 6.2.103 Sensed medium The manufacturer shall declare the nature of the sensed medium for which the device is designed. SIST EN 1854:2010

EN 1854:2010 (E) 13 6.2.104 PSD-S The 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 61058-1:2002, 13.2 and 13.3 and EN 61058-1/A2:2008, 13.3; b) 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, IP44 shall be met as a minimum. 6.3 Materials 6.3.1 General material requirements Shall be according to EN 13611:2007, 6.3.1. 6.3.2 Housing EN 13611:2007, 6.3.2 is replaced by the following: Parts of the housing of PSDs 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. For PSDs with a withstand pressure up to and including 60 kPa (600 mbar) the use of non-metallic material is allowed 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; and 2) a leakage rate of 70 dm3/h of air is not exceeded after the test described in 6.3.3, 2nd paragraph. NOTE When inside a housing a diaphragm separates the gas-carrying compartment from atmosphere then this is considered to be indirectly separated. 6.3.3 Test for leakage of housing after removal of non-metallic parts EN 13611:2007, 6.3.3 is replaced by the following: 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 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: SIST EN 1854:2010

EN 1854:2010 (E) 14 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 to return 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 Shall be 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 Shall be according to EN 13611:2007, 6.3.6. 6.3.7 Impregnation Shall be according to EN 13611:2007, 6.3.7. 6.3.8 Seals for glands for moving parts Shall be according to EN 13611:2007, 6.3.8. 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 (all parts) (Method A, 1,8 MPa load) and by reference to the plastics manufacturer's data. 6.4 Gas connections 6.4.1 Making connections Shall be according to EN 13611:2007, 6.4.1 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.4.2 Connection sizes Shall be according to EN 13611:2007, 6.4.2 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.4.3 Threads Shall be according to EN 13611:2007, 6.4.3 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.4.4 Union joints Shall be according to EN 13611:2007, 6.4.4 with the following modification: SIST EN 1854:2010

EN 1854:2010 (E) 15 This requirement only applies to PSDs designed for combustible gas. 6.4.5 Flanges Shall be according to EN 13611:2007, 6.4.5 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.4.6 Compression fittings Shall be according to EN 13611:2007, 6.4.6. 6.4.7 Nipples for pressure test Shall be according to EN 13611:2007, 6.4.7 with the following modification: This requirement only applies to PSDs designed for combustible gas. 6.4.8 Strainers EN 13611:2007, 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 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 50 kPa (500 mbar). 6.5 Electronic parts of the control 6.5.1 General Shall be according to EN 13611:2007, 6.5.1 with the following modification and addition: Modification: EN 13611:2007, 6.5.1, 4th paragraph and Note are not applicable. Addition: A method for the assessment of EPSDs is defined in 6.6. 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. SIST EN 1854:2010

EN 1854:2010 (E) 16 6.5.2 Protection provided by the enclosure Shall be according to EN 13611:2007, 6.5.2. 6.5.3 Electrical components Shall be 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 Shall be according to EN 13611:2007, 6.6.1 with the following addition: Annex E: the fault modes resulting from the safety analysis in 6.5.1 are applicable as well. 6.6.2 Class A Shall be according to EN 13611:2007, 6.6.2. 6.6.3 Class B 6.6.3.1 Design and construction requirements Shall be according to EN 13611:2007, 6.6.3.1. 6.6.3.2 First fault Shall be according to EN 13611:2007, 6.6.3.2 with the following modification and addition: 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 h. 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 continue to function in accordance with the performance requirements as specified in Clause 7, especially with 7.101.2. 6.6.3.3 Fault introduced during lock-out or safety- shut-down EN 13611:2007, 6.6.3.3 is not applicable. 6.6.4 Class C 6.6.4.1 Design and construction requirements Shall be according to EN 13611:2007, 6.6.4.1. SIST EN 1854:2010

EN 1854:2010 (E) 17 6.6.4.2 First fault Shall be according to EN 13611:2007, 6.6.4.2 with the following modification and addition: Modification: EN 13611:2007, 6.6.4.2, c) is not applicable. Addition: 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 continue to function in accordance with the performance requirements as specified in Clause 7, especially with 7.101.2. 6.6.4.3 Second fault Shall be according to EN 13611:2007, 6.6.4.3 with the following modification: EN 13611:2007, 6.6.4.3, a) is not applicable. 6.6.4.4 Fault introduced during lock-out or safety- shut-down EN 13611:2007, 6.6.4.4 is not applicable. 6.6.5 Circuit and construction evaluation Shall be according to EN 13611:2007, 6.6.5. 7 Performance 7.1 General EN 13611:2007, 7.1 shall be replaced by the following: Controls shall operate correctly under all combinations of the following:  from the minimum inlet pressure to the maximum inlet pressure,  ambient temperature range from 0 °C to 60 °C or wider limits, if declared by the manufacturer;  in all mounting positions declared by the manufacturer;

 voltage or current range from 85 % to 110 % of the rated supply value or from 85 % of the minimum rated value to 110 % of the maximum rated value. If there is a mounting position(s) declared by the manufacturer where the PSD cannot operate from minimum inlet pressure to the maximum inlet pressure, the range of inlet pressures for that mounting position(s) shall be declared separately. SIST EN 1854:2010

EN 1854:2010 (E) 18 The functionality of the PSD shall be declared by the manufacturer from the minimum inlet pressure up to the maximum inlet pressure. The behaviour of the PSD shall be declared by the manufacturer from

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