Combustion product sensing devices for gas burners and gas burning appliances

EN 16340 specifies the safety, construction and performance requirements for combustion product sensing devices intended to be used in combustion control systems, hereinafter referred to as CPSD. This European Standard applies to sensing devices for the measurement of combustion products from burners and appliances for domestic, commercial and industrial use burning: - gaseous fuels according to EN 437; or - liquid fuels having a viscosity at the burner inlet of 1,6 mm2/s (cSt) up to 6 mm2/s (cSt) at 20 °C, higher boiling petroleum based first raffinates (viscosity greater than 6 mm2/s), that require preheating for proper atomisation. This European Standard applies to all types of stationary sensing devices measuring flue gas components O2, CO, CO2, H2, CxHy, NOX, SO2 or for a combination of them (multiple gasses). This European Standard applies also to sensing devices for extractive systems. This European Standard does not cover sensor requirements for combustible gas, combustible gas mixture and oil quality.

Sensoren zur Detektion von gasförmigen Verbrennungsprodukten in Gasbrennern und Gasgeräten

Diese Europäische Norm legt die Anforderungen für Sicherheit, Konstruktion und Funktion von Abgasfühlern für die Verwendung in Systemen zur Feuerungsregelung/Überwachung fest. Diese Europäische Norm befasst sich ausschließlich mit der Typprüfung. Diese Europäische Norm gilt für Messfühler von Verbrennungsprodukten für Brenner und Brennstoffgeräte für den privaten, kommerziellen, und industriellen Gebrauch:
- gasförmige Brennstoffe nach EN 437; oder
- Flüssigbrennstoffe mit einer Viskosität am Brennereintritt bei 20 °C von 1,6 mm2/s (cSt) bis 6 mm2/s (cSt), höher siedende Fraktionen aus der ersten Raffination von Erdöl (Viskosität größer als 6 mm2/s), für die eine Vorwärmung notwendig ist, um eine ordnungsgemäße Zerstäubung zu errei-chen.
Diese Europäische Norm gilt für alle Arten von ortsfesten Messfühlern für die Bestandteile von Abgas O2, CO, CO2, COe (CO, H2, CxHy usw.), NOx, SO2. Diese Europäische Norm gilt ebenfalls für Messfühler in einem Absaugssystem (extraktiven System). Diese Europäische Norm enthält keine Anforderungen an Messfühler für brennbares Gas, brennbares Gas-gemisch sowie die Ölqualität.

Dispositifs de détection des produits de combustion pour brûleurs à gaz et appareils à gaz

La présente Norme européenne prescrit les exigences de sécurité, de construction et de fonctionnement
relatives aux dispositifs de détection de produits de combustion destinés à être utilisés dans des systèmes de
contrôle de combustion.
La présente Norme européenne ne couvre que les essais de type.
La présente Norme européenne s'applique aux dispositifs de détection utilisés pour mesurer les produits de
combustion des brûleurs et des appareils à usage domestique, commercial et industriel utilisant :
⎯ des combustibles gazeux selon l'EN 437 ; ou
⎯ des combustibles liquides dont la viscosité à l'admission du brûleur est comprise entre 1,6 mm²/s (cSt) et
6 mm2/s (cSt) à 20 °C, et les premiers raffinats du pétrole à point d'ébullition plus élevé (viscosité
supérieure à 6 mm2/s), qui nécessitent un préchauffage pour assurer une atomisation adéquate.
La présente Norme européenne s'applique à tous les types de dispositifs de détection fixes mesurant les
composants des gaz de combustion O2, CO, CO2, COe (CO, H2, CxHy, etc.), NOX, SO2.
La présente Norme européenne s'applique également aux dispositifs de détection pour systèmes à extraction.
La présente Norme européenne ne couvre pas les spécifications des capteurs au regard de la qualité du gaz
combustible, du mélange gazeux combustible ou du fioul.

Zaznavala produktov zgorevanja za plinske gorilnike in plinske aparate

Standard EN 16340 določa varnostne zahteve, konstrukcijske zahteve in zahteve glede zmogljivosti za zaznavala produktov zgorevanja, namenjena uporabi v sistemih za nadzorovanje zgorevanja. Ta evropski standard se uporablja za zaznavala za merjenje produktov zgorevanja iz gorilnikov in aparatov za gospodinjsko, komercialno in industrijsko kurjenje: – plinasta goriva v skladu s standardom EN 437; ali – tekoča goriva z viskoznostjo pri dovodu gorilnika 1,6 mm2/s (cSt) do 6 mm2/s (cSt) pri 20 °C, prvi rafinati z višjim vreliščem na osnovi nafte (viskoznost večja od 6 mm2/s), ki jih je treba predhodno segreti za ustrezno atomizacijo. Ta evropski standard se uporablja za vse vrste stacionarnih zaznaval, ki merijo komponente dimnega plina O2, CO, CO2, H2, CxHy, NOX, SO2, ali za njihovo kombinacijo (več plinov). Ta evropski standard se uporablja tudi za zaznavala za ekstraktivne sisteme. Ta evropski standard ne zajema zahtev glede senzorjev za vnetljivi plin, mešanico vnetljivih plinov in kakovost olja.

General Information

Status
Published
Public Enquiry End Date
19-Feb-2012
Publication Date
10-Aug-2014
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Jul-2014
Due Date
14-Sep-2014
Completion Date
11-Aug-2014

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zaznavala produktov zgorevanja za plinske gorilnike in plinske aparateSensoren zur Detektion von gasförmigen Verbrennungsprodukten in Gasbrennern und GasgerätenDispositifs de détection des produits de combustion pour brûleurs à gaz et appareils à gazCombustion product sensing devices for gas burners and gas burning appliances27.060.20Plinski gorilnikiGas fuel burnersICS:Ta slovenski standard je istoveten z:EN 16340:2014SIST EN 16340:2014en,fr,de01-september-2014SIST EN 16340:2014SLOVENSKI

STANDARD
SIST EN 16340:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16340
June 2014 ICS 27.060.20 English Version

Safety and control devices for burners and appliances burning gaseous or liquid fuels - Combustion product sensing devices

Dispositifs de commande et de sécurité pour brûleurs et appareils utilisant des combustibles gazeux ou liquides - Dispositifs de détection des produits de combustion

Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe - Abgasfühler This European Standard was approved by CEN on 14 May 2014.

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-CENELEC 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-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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

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

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16340:2014 ESIST EN 16340:2014

EN 16340:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................5 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................6 3 Terms and definitions ...........................................................................................................................6 4 Classification ..........................................................................................................................................9 4.1 Classes of control ..................................................................................................................................9 4.2 Groups of control...................................................................................................................................9 4.3 Classes of control functions ................................................................................................................9 5 Units of measurement and test conditions ...................................................................................... 10 5.1 Dimensions .......................................................................................................................................... 10 5.2 Pressures ............................................................................................................................................. 10 5.3 Bending moments and torques ......................................................................................................... 10 5.4 Test conditions and measurement tolerances ................................................................................ 10 6 Construction requirements ................................................................................................................ 10 6.1 General ................................................................................................................................................. 10 6.2 Mechanical parts of the control ......................................................................................................... 10 6.3 Materials .............................................................................................................................................. 11 6.4 Gas connections ................................................................................................................................. 14 6.5 Electronic parts of the control ........................................................................................................... 15 6.6 Protection against internal faults for the purpose of functional safety ........................................ 16 7 Performance ........................................................................................................................................ 18 7.1 General ................................................................................................................................................. 18 7.2 Leak-tightness ..................................................................................................................................... 19 7.3 Test for leak-tightness ....................................................................................................................... 19 7.4 Torsion and bending .......................................................................................................................... 22 7.5 Torsion and bending tests ................................................................................................................. 22 7.6 Rated flow rate .................................................................................................................................... 22 7.7 Test for rated flow rate ....................................................................................................................... 22 7.8 Durability ............................................................................................................................................. 22 7.9 Performance tests for electronic controls ....................................................................................... 23 7.10 Long-term performance for electronic controls .............................................................................. 23 7.101 Operation of the CPSD ....................................................................................................................... 24 7.102 Endurance ........................................................................................................................................... 35 8 EMC/Electrical requirements ............................................................................................................. 36 SIST EN 16340:2014

EN 16340:2014 (E) 3 8.1 Protection against environmental influences................................................................................... 36 8.2 Supply voltage variations below 85 % of rated voltage .................................................................. 36 8.3 Short-term voltage interruptions and decreases ............................................................................. 36 8.4 Supply frequency variations .............................................................................................................. 36 8.5 Surge immunity test ............................................................................................................................ 36 8.6 Electrical fast transient/burst ............................................................................................................. 37 8.7 Immunity to conducted disturbances ............................................................................................... 37 8.8 Immunity to radiated fields ................................................................................................................. 37 8.9 Electrostatic discharge immunity test .............................................................................................. 37 8.10 Power frequency magnetic field immunity test ................................................................................ 37 8.11 Electrical requirements ....................................................................................................................... 37 9 Marking, installation and operating instructions ............................................................................. 37 9.1 Marking ................................................................................................................................................. 37 9.2 Installation and operating instructions ............................................................................................. 37 9.3 Warning notice ..................................................................................................................................... 38 Annex A (informative)

Gas connections in common use in the various countries .................................. 39 Annex B (informative)

Leak-tightness test — volumetric method ............................................................. 40 Annex C (informative)

Leak-tightness test — pressure loss method ........................................................ 41 Annex D (normative)

Conversion of pressure loss into leakage rate ........................................................ 42 Annex E (normative)

Electrical/electronic component fault modes .......................................................... 43 Annex F (normative)

Additional requirements for safety accessories and pressure accessories as defined in EU Directive 97/23/EC .................................................................................................. 44 Annex G (normative)

Materials for pressurized parts ................................................................................. 45 Annex H (informative)

Additional materials for pressurized parts............................................................. 46 Annex I (normative)

Requirements for controls used in DC supplied gas burners and gas burning appliances .............................................................................................................................. 47 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous fuels ........ 48 Bibliography ...................................................................................................................................................... 50

Figures Figure 1 — CPSD coupled with combustion control system ......................................................................... 6 Figure 2 — Clarification of definitions for CPSD ............................................................................................. 7 Figure 4 — Leak-tightness provided by the housing and mounting........................................................... 19 Figure 5 — Test equipment for influence of leakage on measurement value ............................................ 20 Figure 6 — Response times ............................................................................................................................ 27 Figure 7 — Alternative test equipment for response time ........................................................................... 28 Figure 8 — Recovery time R90 ........................................................................................................................ 31

SIST EN 16340:2014

EN 16340:2014 (E) 4 Tables Table 1 — Measurement uncertainties .............................................................................................................9 Table 2 – material specification ...................................................................................................................... 13 Table 3 — Saturation vapour pressure .......................................................................................................... 32 Table 4 — Interfering components and their concentration ....................................................................... 33 Table ZA.1 — Correspondence between this European Standard and Directive (Directive 2009/142/EC relating to appliances burning gaseous fuels) .......................................................... 47

SIST EN 16340:2014

EN 16340:2014 (E) 5 Foreword This document (EN 16340:2014) 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 December 2014, and conflicting national standards shall be withdrawn at the latest by December 2014. 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 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 2009/142/EC. For relationship with EU Directive 2009/142/EC, see informative Annex ZA, which is an integral part of this document. This document is intended to be used in conjunction with EN 13611:2007+A2:2011. This document refers to clauses of EN 13611:2007+A2:2011 or adapts clauses 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+A2:2011 which are particular to this standard. These clauses and subclauses are not indicated as an addition. i.e. subclauses or annexes which are additional to those in EN 13611:2007+A2:2011 are numbered starting from 101 or are designated as Annex AA, BB, CC etc. When referring to EN 13611:2007+A2:2011 the word “control” is understood as “combustion product sensing device”. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16340:2014

EN 16340:2014 (E) 6 1 Scope This European Standard specifies the safety, construction and performance requirements for combustion product sensing devices intended to be used in combustion control systems, hereinafter referred to as CPSD. This European Standard applies to sensing devices for the measurement of combustion products from burners and appliances for domestic, commercial and industrial use burning: — gaseous fuels according to EN 437; or — liquid fuels having a viscosity at the burner inlet of 1,6 mm2/s (cSt) up to 6 mm2/s (cSt) at 20 °C, higher boiling petroleum based first raffinates (viscosity greater than 6 mm2/s), that require preheating for proper atomisation. This European Standard applies to all types of stationary sensing devices measuring flue gas components O2, CO, CO2, H2, CxHy, NOX, SO2 or for a combination of them (multiple gasses). This European Standard applies also to sensing devices for extractive systems. This European Standard does not cover sensor requirements for combustible gas, combustible gas mixture and oil quality. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1856-1:2009, Chimneys - Requirements for metal chimneys - Part 1: System chimney products EN 10088-1:2005, Stainless steels - Part 1: List of stainless steels EN 13611:2007+A2:2011, Safety and control devices for gas burners and gas burning appliances - General requirements EN 14241-1, Chimneys - Elastomeric seals and elastomeric sealants - Material requirements and test methods - Part 1: Seals in flue liners EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007+A2:2011 and the following apply. 3.101 Combustion Product Sensing Device (CPSD) Combustion Product Sensing Element (CPSE) combined with control unit and a signal conditioner Note 1 to entry: The combustion product sensing element is hereafter referred to as CPSE. Note 2 to entry: The CPSE control unit and/or the signal conditioner can be integrated in the combustion control system (see Figure 1). Note 3 to entry: Additional components (e.g. heater, flame arrester) used or necessary for operation are considered as parts of the CPSD. SIST EN 16340:2014

EN 16340:2014 (E) 7

Figure 1 — CPSD coupled with combustion control system 3.102 Combustion Product Sensing Element (CPSE) part of the CPSD, which transforms the concentration of the sensed combustion product into a physical value (e.g. voltage, current, resistance) 3.103 CPSE control unit unit that provides additional functions in order to operate the sensing element Note 1 to entry: Example of additional function is the control of the heating element. 3.104 signal conditioner electronic circuit that transforms the physical value from the sensing element into an output signal Note 1 to entry: The signal conditioner may consist of functional electronics as well as electronics which cause the CPSD to be classified as Class B or C according to EN 13611:2007+A2:2011. 3.105 measuring range declared range between two values that can be measured by the CPSD with the accuracy stated in the installation and operating instructions 3.106 offset positive or negative deviation of the zero point value 3.107 accuracy ability of the CPSD to provide an indicated value close to the true value 3.108 linearity highest value of the deviation between the CPSD output characteristic from the ideal curve 3.109 drift difference between the value indicated/measured value by the CPSD before and after the endurance test SIST EN 16340:2014

EN 16340:2014 (E) 8 3.110 temperature range (flue gas) temperature range of the medium to be measured 3.111 hysteresis the highest value of the difference between the ascending and the descending CPSD output characteristic Note 1 to entry: For illustration refer to Figure 2.

Key 1 hysteresis X combustion product concentration Y CPSD output signal Figure 2 — Clarification of definitions for CPSD 3.112 repeatability ability of the CPSD to provide similar output signals whilst measuring the same concentration of combustion product under the same test condition 3.113 flue gas pressure differential pressure from flue gas side to reference (ambient) side 3.114 flue gas velocity speed of the combustion product flow at the location of measurement of the CPSD (m/s) 3.115 warm up time time from power on until specified operation 3.116 stand by mode non-operational mode in which the CPSD is able to come in operation after a start up time SIST EN 16340:2014

EN 16340:2014 (E) 9 3.117 start up time time from stand by mode until specified operation 3.118 response time Tx time interval from the start of the gas concentration step shaped change until the output signal of the CPSD has reached x % of the final value 3.119 useful lifetime time span where the CPSD fulfils the specifications as stated in the installation and operating instructions 3.120 combustibles gaseous, liquid, and solid fuels Note 1 to entry: Combustibles can be oil, gas, bio-fuel, etc. 3.121 cross sensitivity influence on the measured value by any predictable flue gas component Note 1 to entry: Flue gas components can be O2, CO2, H2O, SO2, NOx, CO, H2, CxHy, etc. 3.122 maximum concentration highest concentration at which the CPSD may be operated 3.123 withstand concentration concentration that is withstood without a degraded characteristic after returning below the maximum concentration 3.124 poisoning damage to the CPSE by certain substances, reducing the useful lifetime of the CPSD 3.125 inoperative state state of the output signal that indicates the inoperative condition of the CPSD 4 Classification 4.1 Classes of control EN 13611:2007+A2:2011, 4.1 is not applicable. 4.2 Groups of control EN 13611:2007+A2:2011, 4.2. is not applicable. 4.3 Classes of control functions Shall be according to EN 13611:2007+A2:2011, 4.3. SIST EN 16340:2014

EN 16340:2014 (E) 10 5 Units of measurement and test conditions 5.1 Dimensions Shall be according to EN 13611:2007+A2:2011, 5.1. 5.2 Pressures Shall be according to EN 13611:2007+A2:2011, 5.2. 5.3 Bending moments and torques Shall be according to EN 13611:2007+A2:2011, 5.3. 5.4 Test conditions and measurement tolerances Shall be according to EN 13611:2007+A2:2011, 5.4 with the following additions and modification: Modification: The paragraphs 1, 2, 3 and 4 of EN 13611:2007+A2:2011, 5.4 are not applicable. Addition: The measurement uncertainty of the test equipment used for the test in Clause 6 and 7 shall not exceed the values given in 5.4 of EN 13611:2007+A2:2011 and Table 1. Table 1 — Measurement uncertainties Type of Measurement Uncertainties Temperature above 50 °C ± 2 % of absolute measurement value in °C Test gas concentration 1/3 of the accuracy as declared for the CPSD under test. Flow rate/velocity ± 10 % Differential pressure ± 10 % 6 Construction requirements 6.1 General Shall be according to EN 13611:2007+A2:2011, 6.1 with the following addition: All parts of a CPSD in contact with flue gas shall withstand the chemical stresses to which it is subjected under normal conditions. 6.2 Mechanical parts of the control 6.2.1 Appearance Shall be according to EN 13611:2007+A2:2011, 6.2.1. 6.2.2 Holes EN 13611:2007+A2:2011, 6.2.2 is not applicable. SIST EN 16340:2014

EN 16340:2014 (E) 11 6.2.3 Breather holes EN 13611:2007+A2:2011, 6.2.3 is not applicable. 6.2.4 Test for leakage of breather holes EN 13611:2007+A2:2011, 6.2.4 is not applicable. 6.2.5 Screwed fastenings EN 13611:2007+A2:2011, 6.2.5 is not applicable. 6.2.6 Jointing EN 13611:2007+A2:2011, 6.2.6 is not applicable. 6.2.7 Moving parts EN 13611:2007+A2:2011, 6.2.7 is not applicable. 6.2.8 Sealing caps Shall be according to EN 13611:2007+A2:2011, 6.2.8. 6.2.9 Dismantling and reassembly Shall be according to EN 13611:2007+A2:2011, 6.2.9 with the following modification and addition: Modification: The 2nd and 3rd paragraphs of EN 13611:2007+A2:2011, 6.2.9 are not applicable. Addition: If closure parts, including those of measuring and test points, may be dismantled for service or adjustment then sufficient details shall be provided in the installation and operating instructions on the materials to be used and procedures to be applied. 6.2.101 Protection against blockage of inlets Inlets for reference gas and combustion product gas shall be protected against blockage or they shall be located such that they do not easily become blocked. 6.3 Materials 6.3.1 General material requirements Shall be according to EN 13611:2007+A2:2011, 6.3.1. 6.3.2 Housing EN 13611:2007+A2:2011, 6.3.2 is not applicable. 6.3.3 Test for leakage of housing after removal of non-metallic parts EN 13611:2007+A2:2011, 6.3.3 is not applicable. SIST EN 16340:2014

EN 16340:2014 (E) 12 6.3.4 Zinc alloys EN 13611:2007+A2:2011, 6.3.4 is not applicable. 6.3.5 Springs providing closing and/or sealing force EN 13611:2007+A2:2011, 6.3.5 is not applicable. 6.3.6 Resistance to corrosion and surface protection EN 13611:2007+A2:2011, 6.3.6 is not applicable. 6.3.7 Impregnation EN 13611:2007+A2:2011, 6.3.7 is not applicable. 6.3.8 Seals for glands for moving parts EN 13611:2007+A2:2011, 6.3.8 is not applicable. 6.3.101 Mounting and fixing elements Mounting and fixing elements of the CPSD shall not affect the accuracy of the CPSD itself. 6.3.102 Prevention from igniting 6.3.102.1 Requirement If the sensing element uses a heating element for operation and if the sensing element or the heating element is placed in the sensed medium, possible ignition of combustibles shall be prevented by: — the use of flame arresters; or — having a Class B CPSE control unit, preventing the heating element from reaching a temperature above the ignition temperature of the foreseeable combustibles under fault condition of the CPSE control unit; or — using a heating element which cannot exceed the lowest possible ignition temperature of the foreseeable combustibles, e.g. by using a thermal fuse not igniting the combustibles. The design documentation should specify how this requirement is achieved. If a Class B CPSE control unit is used this shall be assessed by the requirements of 6.6.3. If a flame arrester is implemented it shall be designed in a way that prevents mechanical impact (e.g. widening of meshes) rendering it ineffective. The installation and operating instruction shall state the combustibles for which the used flame arrester of the CPSD is suitable. Testing of CPSD incorporating a flame arrester shall be according to 6.3.102.2. 6.3.102.2 Testing of CPSD with flame arrester The CPSD shall be installed into a test chamber (see Figure 3) with the following constraints: — The volume of the test chamber shall be 200 times larger than the volume of the CPSD part containing the hot ignition source (CPSE, heating, etc.) including the gas volume of the flame arrester but at least 1 000 cm3. SIST EN 16340:2014

EN 16340:2014 (E) 13 — All distances between CPSD housing and chamber walls (except the mounting wall) shall be at least 50 mm to avoid wall effects. — The flow in the test chamber shall be such that the gas exchange in the flame arrester is guaranteed without cooling down the CPSE.

To reduce test gas consumption an explosion proof fan may be installed inside the test chamber. In that case a minimum distance of 50 mm between fan and CPSD shall be maintained. — The test gas mixture shall consist of 5 -% (V/V) propane and 95 -% (V/V) air. — The absolute air pressure inside the test chamber shall be 101 kPa ± 10 %. — The gas temperature inside the test chamber shall be at least 20 °C. The installation shall be done as stated in the installation and operating instructions paying particular attention to immersion depth and angle to horizontal. The test gas mixture shall flow continuously through or within the test chamber and the CPSD shall be operated in a way that causes the highest specified temperature of the CPSE (the 5/95 % propane/air mixture is the condition with the highest probability of ignition, so no additional requirements are needed). After temperature stabilisation, the test shall be performed for a minimum period of 5 × T60 or 1 min, whichever is the longer. During the test no ignition shall occur. Dimensions in millimetres

Key 1 CPSD under test 2 Test chamber 3 flame arrester of the test chamber 4 flow metre 5 throttle 6 valve 7 burst foil 8 free space surrounding the CPSD Figure 3 — Ignition test fixture SIST EN 16340:2014

EN 16340:2014 (E) 14 6.3.103 Metallic materials for components in contact with combustion products In accordance with EN 1856-1 components in contact with combustion products are assumed to be sufficiently durable without further testing if they consist of materials listed in Table 2. Table 2 – material specification Material no.

(according to EN 10088–1:2005) Symbol 1.4301 X5CrNi 18–10 1.4307 X2CrNi 18–9 1.4401 X5CrNiMo 17–12–2 1.4404 X2CrNiMo 17–12–2 1.4571 X6CrNiMoTi 17–12–2 1.4432 X2CrNiMo 17–12–3 1.4539 X1NiCrMoCu 25–20–5 The suitability of metallic materials others than listed in Table 2 shall be proven according to EN 1856-1:2009, A.2. 6.4 Gas connections 6.4.1 Making connections EN 13611:2007+A2:2011, 6.4.1 is not applicable. 6.4.2 Connection sizes EN 13611:2007+A2:2011, 6.4.2 is not applicable. 6.4.3 Threads EN 13611:2007+A2:2011, 6.4.3 is not applicable. 6.4.4 Union joints Shall be according to EN 13611:2007+A2:2011, 6.4.4 with the following addition. This requirement is only applicable when the gases are extracted from a main flow. 6.4.5 Flanges EN 13611:2007+A2:2011, 6.4.5 is not applicable. 6.4.6 Compression fittings Shall be according to EN 13611:2007+A2:2011, 6.4.6. 6.4.7 Nipples for pressure test EN 13611:2007+A2:2011, 6.4.7 is not applicable. SIST EN 16340:2014

EN 16340:2014 (E) 15 6.4.8 Strainers EN 13611:2007+A2:2011, 6.4.8 is not applicable. 6.4.101 CPSD connections The type, materia

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