prEN 12067-2

Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic types

This European Standard specifies the safety, construction and performance requirements for electronic fuel/air ratio control system (ERC), electronic fuel/air ratio supervision system (ERS) and electronic fuel/air ratio trim system (ERT) intended for use with burners and appliances burning gaseous or liquid fuels. It also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use.
This European Standard is applicable to
— closed loop fuel/air ratio control systems, see 3.101;
— fuel/air ratio supervision systems, see 3.102;
— closed loop fuel/air ratio trim systems, see 3.103;
and does not differentiate into classification by heat input.
NOTE 1 European Standards for burners, appliances or processes which use ERC, ERS or ERT can override the requirements of this standard.
NOTE 2 Provisions for production control are not part of this European Standard.

Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe - Regel- und Steuerfunktionen in elektronischen Systemen - Teil 2: Elektronische Gas-Luft-Verbundregel- und -überwachungseinrichtungen

Dieses Dokument legt die Sicherheits-, Konstruktions- und Leistungsanforderungen für elektronische Brennstoff-Luft-Verbundregeleinrichtungen (ERC, en: electronic fuel/air ratio control system), elektronische Brennstoff-Luft-Verbundüberwachungseinrichtungen (ERS, en: electronic fuel/air ratio supervision system) und elektronische Brennstoff-Luft-Verbundtrimmsteuerungen (ERT, en: electronic fuel/air ratio trim system) für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe fest. Darüber hinaus beschreibt sie die Prüfverfahren zur Bewertung dieser Anforderungen und legt die für Einbau und Betrieb erforderlichen Angaben fest.
Dieses Dokument gilt für:
 Brennstoff-Luft-Verbundregelsysteme mit geschlossenem Regelkreis, siehe 3.101,
 Brennstoff-Luft-Verbundüberwachungssysteme, siehe 3.102;
 Brennstoff-Luft-Verbundtrimmsysteme mit geschlossenem Regelkreis, siehe 3.103,
und unterscheidet bei der Klassifizierung nicht nach Wärmebelastung.
ANMERKUNG 1 Europäische Normen für Brenner, Brennstoffgeräte oder Prozesse, die ERC, ERS oder ERT einsetzen, können die Anforderungen dieses Dokuments außer Kraft setzen.
ANMERKUNG 2 Festlegungen für die Produktionskontrolle sind nicht Gegenstand dieses Dokuments

Dispositifs de régulation du rapport air/gaz pour brûleurs à gaz et appareils à gaz - Partie 2: Dispositifs électroniques

Le présent document spécifie les exigences de sécurité, de construction et de performance pour le système de régulation électronique du rapport air/combustible (ERC), le système de surveillance électronique du rapport air/combustible (ERS) et le système de contrôle électronique du rapport air/combustible (ERT) destinés à équiper les brûleurs et appareils à gaz ou fioul. Il décrit aussi les modes opératoires d’essai permettant de vérifier la conformité à ces exigences, ainsi que les informations nécessaires à l’installation et à l’utilisation.
Le présent document est applicable :
— aux systèmes de régulation du rapport air/combustible en boucle fermée, voir 3.101 ;
— aux systèmes de surveillance du rapport air/combustible, voir 3.102 ;
— aux systèmes de contrôle du rapport air/combustible en boucle fermée, voir 3.103 ;
et ne fait pas de classification en fonction du débit calorifique.
NOTE 1 Les Normes européennes pour les brûleurs, appareils ou processus qui utilisent l’ERC, l’ERS ou l’ERT peuvent annuler les exigences du présent document.
NOTE 2 Les dispositions de contrôle de la production ne font pas partie du présent document.

Regulatorji razmerja plina in zraka za plinske gorilnike in plinske aparate - 2. del: Elektronski tip

General Information

• Status: Not Published
• Technical Committee: CEN/TC 58 - Safety and control devices for burners and appliances burning gaseous or liquid fuels
• Drafting Committee: CEN/TC 58/WG 12 - Electronics
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 30-Jul-2021
• Completion Date: 30-Jul-2021
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: oSIST prEN 12067-2:2020 - Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic types

RELATIONS

• Revised: EN 12067-2:2004 - Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic types
• Effective Date: 03-Jul-2019

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12067-2:2020
01-februar-2020

Regulatorji razmerja plina in zraka za plinske gorilnike in plinske aparate - 2. del:

Elektronski tip

Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic

types
Gas-Luft-Verbundregeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2:
Elektronische Ausführung

Dispositifs de régulation du rapport air/gaz pour brûleurs à gaz et appareils à gaz - Partie

2: Dispositifs électroniques
Ta slovenski standard je istoveten z: prEN 12067-2
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 12067-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12067-2:2020
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oSIST prEN 12067-2:2020
DRAFT
EUROPEAN STANDARD
prEN 12067-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2019
ICS Will supersede EN 12067-2:2004
English Version
Gas/air ratio controls for gas burners and gas burning
appliances - Part 2: Electronic types

Dispositifs de régulation du rapport air/gaz pour Gas-Luft-Verbundregeleinrichtungen für Gasbrenner

brûleurs à gaz et appareils à gaz - Partie 2: Dispositifs und Gasgeräte - Teil 2: Elektronische Ausführung

électroniques

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12067-2:2019 E

worldwide for CEN national Members.
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oSIST prEN 12067-2:2020
prEN 12067-2:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 6

Introduction .................................................................................................................................................................... 7

1 Scope .................................................................................................................................................................... 8

2 Normative references .................................................................................................................................... 8

3 Terms and definitions ................................................................................................................................... 9

Figure 1 — Scope of the electronic fuel/air ratio control system (ERC) ................................................... 9

Figure 2 — Scope of the electronic fuel/air ratio supervision system (ERS) ........................................ 10

Figure 3 — Scope of the electronic fuel/air ratio trim system (ERT) ...................................................... 11

Figure 4 — Relationship between fault tolerating time and fault reaction time control for

ERC and ERS .................................................................................................................................................... 12

Figure 5 — Relationship between fault reaction time control for ERT ................................................... 13

4 Classification .................................................................................................................................................. 14

4.1 Classes of control .......................................................................................................................................... 14

4.2 Groups of control .......................................................................................................................................... 14

4.3 Classes of control functions ...................................................................................................................... 14

4.4 Types of DC supplied controls ................................................................................................................. 14

5 Test conditions and uncertainty of measurements ......................................................................... 14

6 Design and construction ............................................................................................................................ 14

6.1 General ............................................................................................................................................................. 14

Table 1 — Acceptable feedback types ................................................................................................................. 15

6.2 Mechanical parts of the control .............................................................................................................. 16

6.3 Materials .......................................................................................................................................................... 16

6.4 Gas connections ............................................................................................................................................ 16

6.5 Electronic parts of the control ................................................................................................................. 16

6.5.1 General ............................................................................................................................................................. 16

6.5.2 Switching elements ...................................................................................................................................... 16

6.5.3 Electrical components ................................................................................................................................ 16

6.6 Protection against internal faults for the purpose of functional safety ................................... 17

6.6.1 Design and construction requirements ............................................................................................... 17

6.6.2 Class A ............................................................................................................................................................... 17

6.6.3 Class B ............................................................................................................................................................... 17

6.6.4 Class C ............................................................................................................................................................... 18

6.6.5 Circuit and construction evaluation ...................................................................................................... 20

7 Performance .................................................................................................................................................. 20

7.1 General ............................................................................................................................................................. 20

7.2 Leak-tightness ............................................................................................................................................... 20

7.3 Torsion and bending ................................................................................................................................... 20

7.4 Rated flow rate .............................................................................................................................................. 20

7.5 Durability ........................................................................................................................................................ 20

7.6 Performance tests for electronic controls .......................................................................................... 20

7.6.1 At ambient temperature ............................................................................................................................ 20

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7.6.2 At minimum temperature.......................................................................................................................... 20

7.6.3 At maximum temperature ......................................................................................................................... 20

7.7 Long-term performance for electronic controls ............................................................................... 20

7.7.1 General ............................................................................................................................................................. 20

7.7.1.101 Performance requirements ........................................................................................................ 20

7.7.1.102 Test conditions ................................................................................................................................ 21

7.7.2 Stress test ........................................................................................................................................................ 21

7.7.3 Long term performance test ..................................................................................................................... 22

7.8 Data exchange ................................................................................................................................................ 22

7.9 Functional requirements ........................................................................................................................... 23

7.9.1 General ............................................................................................................................................................. 23

7.9.2 Interface to the automatic burner control system ........................................................................... 23

7.9.3 Start-up sequence ......................................................................................................................................... 23

7.9.4 Ranges of operation ..................................................................................................................................... 23

Figure 7 — Fault reaction time control for ERC, ERS and ERT .................................................................... 24

7.9.5 Restart from safe state ................................................................................................................................ 24

7.9.6 Accuracy requirements .............................................................................................................................. 25

7.9.7 Requirements for ACF ................................................................................................................................. 25

8 Electrical requirements .............................................................................................................................. 26

8.1 General ............................................................................................................................................................. 26

8.2 Protection by enclosure ............................................................................................................................. 26

9 Electromagnetic compatibility (EMC) ................................................................................................... 26

9.1 Protection against environmental influences .................................................................................... 26

9.2 Supply voltage variations below 85 % of rated voltage.................................................................. 27

9.3 Voltage dips and interruptions ................................................................................................................ 27

9.4 Supply frequency variations ..................................................................................................................... 27

9.5 Surge immunity test ..................................................................................................................................... 28

9.6 Electrical fast transient/burst ................................................................................................................. 28

9.7 Immunity to conducted disturbances induced by radio frequency fields ............................... 28

9.8 Harmonics and interharmonics including mains signalling at a. c. power port, low

frequency immunity tests .......................................................................................................................... 28

9.9 Immunity to radiated fields induced by radio frequency fields .................................................. 29

9.10 Electrostatic discharge test ....................................................................................................................... 29

9.11 Power frequency magnetic field immunity test ................................................................................ 29

10 Marking, instructions .................................................................................................................................. 29

10.1 Marking ............................................................................................................................................................ 29

10.2 Instructions ..................................................................................................................................................... 29

10.3 Warning notice .............................................................................................................................................. 31

10.101 Technical information for the safety after integration in the appliance .................................. 31

Annex A (informative) Abbreviations and symbols ...................................................................................... 32

Annex B (informative) Leak-tightness test for gas controls − Volumetric method ........................... 33

Annex C (informative) Leak-tightness for gas controls − Pressure loss method ................................ 34

Annex D (normative) Calculation of pressure loss into leakage rate ..................................................... 35

Annex E (normative) Electrical/electronic component fault modes ...................................................... 36

Table E.1 — Electrical/electronic component faults modes ....................................................................... 36

Annex F (normative) Additional requirements for safety accessories and pressure

accessories as defined in 2014 /68/EU ................................................................................................ 37

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oSIST prEN 12067-2:2020
prEN 12067-2:2019 (E)

Annex G (normative) Materials for pressurized parts ................................................................................. 38

Annex H (informative) Additional materials for pressurized parts ....................................................... 39

Annex I (normative) Requirements for controls used in DC supplied burners and

appliances burning gaseous or liquid fuels ........................................................................................ 40

Annex J (normative) Method for the determination of a safety integrity level (SIL) ....................... 41

Annex K (normative) Method for the determination of a performance level (PL) ............................ 42

Annex L (informative) Relationship between safety integrity level (SIL) and performance

level (PL) ......................................................................................................................................................... 43

Annex M (normative) Reset functions ............................................................................................................... 44

Annex N (informative) Guidance document on environmental aspects ............................................... 45

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 46

Annex AA (normative) Declaration for sensors, actuators and repeatability ..................................... 47

Table AA.1 — Declaration for sensors ................................................................................................................ 48

Table AA.2 — Declaration for actuators ............................................................................................................. 49

Table AA.3 — Declaration for accuracy .............................................................................................................. 50

Annex BB (normative) Special requirements for single position feed-back potentiometers

in electromechanical actuators ............................................................................................................... 51

Annex CC (informative) Overall fuel/air ratio accuracy ............................................................................. 52

Table CC.1 — Tolerances (exemplary) ............................................................................................................... 53

Annex DD (informative) Guideline for the integration of an ERC, ERS or ERT into the

appliance ......................................................................................................................................................... 54

DD.1 General ............................................................................................................................................................. 54

DD.2 Integrational aspects .................................................................................................................................. 54

DD.3 Rules for mechanical integration ........................................................................................................... 55

DD.4 Rules for electrical integration ............................................................................................................... 55

DD.5 Rules for functional integration / functional tests of the appliance.......................................... 55

DD.6 Responsibility matrix ................................................................................................................................. 55

Table DD.1 — Responsibility matrix ................................................................................................................... 55

Annex EE (informative) Guideline for the definition of limits for safe operation of the

appliance ......................................................................................................................................................... 56

EE.1 Foreword ......................................................................................................................................................... 56

EE.2 General aspects ............................................................................................................................................. 56

EE.2.1 Principles ........................................................................................................................................................ 56

EE.2.2 Risk of explosion .......................................................................................................................................... 56

EE.2.3 Risk of poisoning .......................................................................................................................................... 56

EE.2.4 Risk of fire ....................................................................................................................................................... 56

EE.2.5 Risk of vibrations ......................................................................................................................................... 56

EE.2.6 Other risks ...................................................................................................................................................... 57

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EE.3 Rules for the evaluation of the risk of explosion ............................................................................... 57

EE.3.1 General ............................................................................................................................................................. 57

EE.3.2 ERC, ERS or ERT used in gas burners in accordance with EN 676 ............................................... 57

EE.3.3 ERC, ERS or ERT used in other appliances ........................................................................................... 57

Table EE.1 — Example of lower explosion limits (LEL) and ignition temperatures for

different combustibles. .............................................................................................................................. 57

Table EE.2 — Maximum concentration of combustibles for safe operation .......................................... 58

EE.4 Rules for the evaluation of the risk of poisoning .............................................................................. 58

Figure EE.2 — Test room dimensions .................................................................................................................. 59

Table EE.3 — Maximum leakage rate .................................................................................................................. 60

EE.5 Rules for the evaluation of the risk of fire ........................................................................................... 60

EE.6 Rules for the evaluation of the risks due to vibration ..................................................................... 60

Annex FF (normative) Requirements for using alternative actuators on application level ........... 62

FF.1 General ............................................................................................................................................................. 62

FF.2 Requirements for the use of alternative actuators .......................................................................... 62

FF.2.1 Safety and functional requirements specification ............................................................................ 62

FF.2.1.1 Requirements for actuators ............................................................................................................. 62

FF.2.1.2 Requirements for the interface to the ECU ................................................................................. 63

FF.2.2 Risk assessment ............................................................................................................................................ 63

FF.2.3 Test of the ERC/ERS/ERT with alternative actuators in the application .................................. 64

FF.2.4 Alternative actuators SIL qualified according to EN 61508 .......................................................... 64

FF.3 Documentation .............................................................................................................................................. 64

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Regulation (EU) 2016/426 aimed to be covered ............................................. 65

Table ZA.1 — Correspondence between this European Standard with Regulation (EU)

2016/426 ......................................................................................................................................................... 66

Annex ZB (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2014/68/EU concerning pressure equipment ...................... 69

Bibliography ................................................................................................................................................................. 70

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oSIST prEN 12067-2:2020
prEN 12067-2:2019 (E)
European foreword

This document (prEN 12067-2:2019) 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 12067-2:2004.

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 Directives.

For relationship with EU Directives, see informative Annexes ZA and ZB, which are integral parts of this

document.

It should be noted that the following significant changes compared to the previous edition have been

incorporated in this European Standard:
a) alignment with EN 13611:2019;

b) title changed to include liquid fuel and to bring it in line with the title of EN 13611:2019

b) integration of the requirements for fuel/air ratio using oil as the fuel;
c) addition of the control types ERS and ERT and
d) updating to EN 60730-1:2016;
e) update requirements for fault reaction time and fault tolerating time;
f) updating the Annexes for sensors and actuators (see, Annex AA);

g) including the use of pressure and combustion products sensing devices already conforming to

EN 1854:2010, EN 60730-2-6:2016, and EN 16340:2014 respectively;

h) new Annex Guideline for the integration of ERC, ERS or ERT into the appliances (see, Annex DD);

i) new Annex Guideline for the definition of limits for safe operation on the appliance (see, Annex EE.)

j) new Annex Requirements for using alternative actuators on application level (see, Annex FF.)

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oSIST prEN 12067-2:2020
prEN 12067-2: 2019 (E)
Introduction

This document recognizes the safety philosophy specified by CEN/TC 58 dealing with the safety,

construction and performance of controls for burners and appliances burning gaseous or liquid fuels

and to their testing.

This document refers to clauses of EN 13611:2019 and adapts them, indicating the changes by stating

“with the following modification”, “with the following addition”, “is replaced by the following” or “is not

applicable”. It also adds clauses or subclauses to the structure of EN 13611:2019 which are particular to

this standard (prEN 12067-2:2019). Additional subclauses or annexes are either numbered starting

from 101 or are designated as Annex AA, BB, CC etc. However, it should be noted that these clauses and

subclauses are not indicated as additions in the text.

EN 12067-2 compliance for electronic fuel/air ratio control system cannot be claimed based upon SIL

classification in accordance with EN 61508.

SIL classification cannot be claimed based upon compliance with this document only. A supplementary

method for SIL determination is specified in EN 13611:2019, Annex J.
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oSIST prEN 12067-2:2020
prEN 12067-2:2019 (E)
1 Scope

This document specifies the safety, construction and performance requirements for electronic fuel/air

ratio control system (ERC), electronic fuel/air ratio supervision system (ERS) and electronic fuel/air

ratio trim system (ERT) intended for use with burners and appliances burning gaseous or liquid fuels. It

also describes the test procedures for evaluating these requirements and specifies information

necessary for installation and use.
This document is applicable to
— closed loop fuel/air ratio control systems, see 3.101;
— fuel/air ratio supervision systems, see 3.102;
— closed loop fuel/air ratio
...