Safety and control devices for burners and appliances burning gaseous or liquid fuels - Control functions in electronic systems - Part 2: Fuel/air ratio control/supervision of the electronic type

EN 13611:2019, Clause 1 is replaced by the following:
This document specifies the safety, design, construction and performance requirements, and testing for electronic fuel/air ratio control systems (ERC), electronic fuel/air ratio supervision systems (ERS) and electronic fuel/air ratio trim systems (ERT) intended for use with burners and appliances burning gaseous or liquid fuels. It also describes the 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 trim systems, see 3.103;
and does not differentiate into classification by heat input.
NOTE   The documents for burners, appliances or processes which use ERC, ERS or ERT can override the requirements of this document.

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

EN 13611:2019, Abschnitt 1, wird wie folgt ersetzt:
Dieses Dokument legt die Sicherheits-, Auslegungs-, Konstruktions- und Leistungsanforderungen sowie die Prüfungen für elektronische Einrichtungen zur Regelung (en: electronic fuel/air ratio control system, ERC), Überwachung (en: electronic fuel/air ratio supervision system, ERS) und Justierung (en: electronic fuel/air ratio trim system, ERT) des Brennstoff-Luft-Verhältnisses fest, die zur Verwendung mit Brennern und Geräten bestimmt sind, die gasförmige oder flüssige Brennstoffe verbrennen. Es beschreibt darüber hinaus die Verfahren zur Bewertung der Einhaltung dieser Anforderungen und legt die Informationen fest, die für die Installation und den Gebrauch erforderlich sind.
Dieses Dokument gilt für:
-   Einrichtungen zur Regelung des Brennstoff-Luft-Verhältnisses, siehe 3.101;
-   Einrichtungen zur Überwachung des Brennstoff-Luft-Verhältnisses, siehe 3.102;
-   Einrichtungen zur Justierung des Brennstoff-Luft-Verhältnisses, siehe 3.103;
und enthält keine Klassifizierung nach Wärmezufuhr.
ANMERKUNG   Die Anforderungen in Dokumenten für Brenner, Geräte oder Prozesse, bei denen ERC, ERS oder ERT verwendet werden, können Vorrang vor den Anforderungen in diesem Dokument haben.

Dispositifs de commande et de sécurité pour les brûleurs et les appareils utilisant des combustibles gazeux ou liquides - Dispositifs électroniques de régulation - Partie 2 : Régulation et surveillance du rapport air/combustible de type électronique

L’article 1 de l’EN13611 :20191 est remplacée par ce qui suit :
Ce document spécifie les exigences de sécurité, de construction et de performance ainsi que les essais applicables aux systèmes de régulation électronique du rapport air/combustible (ERC), aux systèmes de surveillance électronique du rapport air/combustible (ERS) et aux systèmes 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    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.

Varnostne in nadzorne naprave za gorilnike in aparate na plin ali tekoča goriva - Regulacijske in nadzorne funkcije v elektronskih sistemih - 2. del: Regulacija in nadzor razmerja goriva in zraka za elektronski tip

General Information

Status
Published
Publication Date
15-Nov-2022
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
21-Dec-2021
Completion Date
16-Nov-2022

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SLOVENSKI STANDARD
SIST EN 12067-2:2023
01-februar-2023
Nadomešča:
SIST EN 12067-2:2004

Varnostne in nadzorne naprave za gorilnike in aparate na plin ali tekoča goriva -

Regulacijske in nadzorne funkcije v elektronskih sistemih - 2. del: Regulacija in

nadzor razmerja goriva in zraka za elektronski tip

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

Control functions in electronic systems - Part 2: Fuel/air ratio control/supervision of the

electronic types

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

Dispositifs de commande et de sécurité pour les brûleurs et les appareils utilisant des

combustibles gazeux ou liquides - Dispositifs électroniques de régulation - Partie 2 :

Régulation et surveillance du rapport air/combustible de type électronique
Ta slovenski standard je istoveten z: EN 12067-2:2022
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
SIST EN 12067-2:2023 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 12067-2:2023
---------------------- Page: 2 ----------------------
SIST EN 12067-2:2023
EN 12067-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 23.060.40; 27.060.20 Supersedes EN 12067-2:2004
English Version
Safety and control devices for burners and appliances
burning gaseous or liquid fuels - Control functions in
electronic systems - Part 2: Fuel/air ratio
control/supervision of the electronic type

Dispositifs de commande et de sécurité pour les Sicherheits- und Regeleinrichtungen für Brenner und

brûleurs et les appareils utilisant des combustibles Brennstoffgeräte für gasförmige oder flüssige

gazeux ou liquides - Dispositifs électroniques de Brennstoffe - Regel- und Steuerfunktionen in

régulation - Partie 2 : Régulation et surveillance du elektronischen Systemen - Teil 2: Elektronische Gas-

rapport air/combustible de type électronique Luft-Verbundregel- und Überwachungseinrichtungen

This European Standard was approved by CEN on 2 October 2022.

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, 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, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12067-2:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

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 ............................................................................................................................ 15

6.1 General ............................................................................................................................................................. 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

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

6.101 Requirements for using alternative actuators on application level .......................................... 20

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

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

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

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

7.4 Rated flow rate .............................................................................................................................................. 21

7.5 Durability ........................................................................................................................................................ 21

7.6 Performance tests for electronic controls .......................................................................................... 21

7.7 Long-term performance for electronic controls ............................................................................... 21

7.8 Data exchange ............................................................................................................................................... 23

7.101 Functional requirements........................................................................................................................... 23

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 ................................................................. 28

9.3 Voltage dips and interruptions ............................................................................................................... 28

9.4 Supply frequency variations .................................................................................................................... 28

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

9.6 Electrical fast transient/burst ................................................................................................................. 29

9.7 Immunity to conducted disturbances induced by radio frequency fields ............................... 29

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

9.9 Electrostatic discharge test ...................................................................................................................... 29

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

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SIST EN 12067-2:2023
EN 12067-2:2022 (E)

9.11 Harmonics and interharmonics including mains signalling at AC power port, low

frequency immunity tests .......................................................................................................................... 30

10 Marking, instructions .................................................................................................................................. 30

10.1 Marking ............................................................................................................................................................ 30

10.2 Instructions ..................................................................................................................................................... 30

10.3 Warning notice .............................................................................................................................................. 32

Annex A (informative) Abbreviations and symbols ...................................................................................... 33

Annex B (informative) Leak-tightness tests for gas controls − volumetric method .......................... 34

Annex C (informative) Leak-tightness tests for gas controls − pressure loss method ..................... 35

Annex D (normative) Calculation of pressure loss into leakage rate ..................................................... 36

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

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

accessories as defined in 2014/68/EU ................................................................................................. 38

Annex G (normative) Materials for pressurized parts ................................................................................. 39

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

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

appliances burning gaseous or liquid fuels......................................................................................... 41

Annex J (normative) Method for the determination of a Safety integrity level (SIL) ....................... 42

Annex K (normative) Method for the determination of a Performance Level (PL) ........................... 43

Annex L (informative) Relationship between Safety Integrity Level (SIL) and Performance

Level (PL) ......................................................................................................................................................... 44

Annex M (normative) Reset functions ................................................................................................................ 45

Annex N (informative) Guidance document on Environmental Aspects ............................................... 46

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 47

Annex AA (normative) Declaration for sensors, actuators and repeatability ..................................... 48

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

in electromechanical actuators ............................................................................................................... 52

BB.1 Requirements ................................................................................................................................................. 52

BB.2 Endurance test ............................................................................................................................................... 52

Annex CC (informative) Overall fuel/air ratio accuracy .............................................................................. 53

CC.1 General ............................................................................................................................................................. 53

CC.2 Method A: ......................................................................................................................................................... 53

CC.3 Method B: ......................................................................................................................................................... 53

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

appliance.......................................................................................................................................................... 55

DD.1 General ............................................................................................................................................................. 55

DD.2 Integrational aspects ................................................................................................................................... 55

DD.3 Rules for mechanical integration ............................................................................................................ 56

DD.4 Rules for electrical integration ................................................................................................................ 56

---------------------- Page: 5 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)

DD.5 Rules for functional integration/functional tests of the appliance ........................................... 56

DD.6 Responsibility matrix ................................................................................................................................. 56

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

appliance ......................................................................................................................................................... 57

EE.1 Introduction ................................................................................................................................................... 57

EE.2 General aspects ............................................................................................................................................. 57

EE.3 Rules for the evaluation of the risk of explosion .............................................................................. 58

EE.4 Rules for the evaluation of the risk of poisoning .............................................................................. 59

EE.5 Rules for the evaluation of the risk of fire ........................................................................................... 61

EE.6 Rules for the evaluation of the risks due to vibration .................................................................... 62

Annex FF (normative) Requirements for using alternative actuators on application level .......... 63

FF.1 General ............................................................................................................................................................. 63

FF.2 Requirements for the use of alternative actuators .......................................................................... 63

FF.3 Documentation .............................................................................................................................................. 65

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

requirements of Directive 2009/142/EC aimed to be covered ................................................... 66

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

requirements of Regulation (EU) 2016/426 aimed to be covered ............................................. 67

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

requirements of Directive 2014/68/EU aimed to be covered ..................................................... 68

Bibliography ................................................................................................................................................................. 69

---------------------- Page: 6 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
European foreword

This document (EN 12067-2:2022) 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 May 2023, and conflicting national standards shall be

withdrawn at the latest by November 2025.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 12067-2:2004.

The following significant changes compared to the previous edition have been incorporated in this

document:
a) alignment with EN 13611:2019;

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

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

h) inclusion of the use of pressure and combustion products sensing devices already conforming to

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

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

j) new Annex Guideline for the definition of limits for safe operation on the appliance (see

Annex EE);

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

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the

United Kingdom.
---------------------- Page: 7 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
Introduction
This document is intended to be used in conjunction with EN 13611:2019.

This document refers to clauses of EN 13611:2019 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 document adds clauses or subclauses to the structure of EN 13611:2019 which are particular to

this document. Subclauses which are additional to those in EN 13611:2019 are numbered starting from

101. Additional Annexes are designated as Annex AA, Annex BB, Annex CC, etc. It should be noted that

these clauses, subclauses and Annexes are not indicated as an addition.

If by reference to EN 13611:2019 the term “control” is given, this term should be read as fuel/air ratio

control/supervision system”.

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

based upon SIL classification according to 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.
---------------------- Page: 8 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
1 Scope
EN 13611:2019, Clause 1 is replaced by the following:

This document specifies the safety, design, construction and performance requirements, and testing for

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

electronic fuel/air ratio trim systems (ERT) intended for use with burners and appliances burning

gaseous or liquid fuels. It also describes the 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 trim systems, see 3.103;
and does not differentiate into classification by heat input.

NOTE The documents for burners, appliances or processes which use ERC, ERS or ERT can override the

requirements of this document.
2 Normative references
EN 13611:2019, Clause 2 applies with the following additions:

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 298:2022, Automatic burner control systems for burners and appliances burning gaseous or liquid

fuels
EN 267:2020, Forced draught burners for liquid fuels
EN 676:2020, Forced draught burners for gaseous fuels

EN 1854:— , Safety and control devices for burners and appliances burning gaseous and/or liquid fuels —

Pressure sensing devices for gas burners and gas burning appliances

EN 13611:2019 , Safety and control devices for burners and appliances burning gaseous and/or liquid

fuels — General requirements

EN 16340:2014, Safety and control devices for burners and appliances burning gaseous or liquid fuels —

Combustion product sensing devices

EN 60204-1:2018, Safety of machinery — Electrical equipment of machines — Part 1: General

requirements (IEC 60204-1:2016)

EN 60335-1:2012 , Household and similar electrical appliances — Safety — Part 1: General requirements

(IEC 60335-1:2010)
Under preparation. Stage at the time of publication: FprEN 1854:2022.
As impacted by EN 13611:2019/AC:2021.
---------------------- Page: 9 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)

EN 60529:1991 , Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)

EN 60730-1:2016 , Automatic electrical controls — Part 1: General requirements (IEC 60730-1:2013,

modified)

EN 60730-2-5:2015 , Automatic electrical controls — Part 2-5: Particular requirements for automatic

electrical burner control systems (IEC 60730-2-5:2013)

EN 60730-2-6:2016 , Automatic electrical controls — Part 2-6: Particular requirements for automatic

electrical pressure sensing controls including mechanical requirements (IEC 60730-2-6:2015)

EN IEC 60730-2-14:2019 , Automatic electrical controls — Part 2-14: Particular requirements for

electric actuators (IEC 60730-2-14:2017)

EN IEC 61000-6-2:2019, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards —

Immunity standard for industrial environments (IEC 61000-6-2:2016)

EN 61000-6-4:2007 , Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission

standard for industrial environments (IEC 61000-6-4:2006)

EN 61010-2-202:2017, Safety requirements for electrical equipment for measurement, control and

laboratory use — Part 2-202: Particular requirements for electrically operated valve actuators

(IEC 61010-2-202:2016)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 13611:2019 apply with the

following modifications.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/

As impacted by EN 60335-1:2012/AC:2014, EN 60335-1:2012/A11:2014, EN 60335-1:2012/A13:2017,

EN 60335-1:2012/A1:2019, EN 60335-1:2012/A2:2019, EN 60335-1:2012/A14:2019 and EN 60335-

1:2012/A15:2021.

As impacted by EN 60529:1991/corrigendum May 1993, EN 60529:1991/A1:2000, EN 60529:1991/A2:2013

and EN 60529:1991/AC:2016-12.
As impacted by EN 60730-1:2016/A1:2019 and EN 60730-1:2016/A2:2022.
As impacted by EN 60730-2-5:2015/A1:2019 and EN 60730-2-5:2015/A2:2021.
As impacted by EN 60730-2-6:2016/A1:2020.

As impacted by EN IEC 60730-2-14:2019/A2:2021 and EN IEC 60730-2-14:2019/A1:2022.

As impacted by EN 61000-6-4:2007/A1:2011.
---------------------- Page: 10 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
3.101
electronic fuel/air ratio control system
ERC

closed loop system consisting of the electronic control unit, actuating elements for the fuel flow and the

air flow as a minimum, and allocated feedback signal(s)

Note 1 to entry: Figure 1 shows an example of different feedback alternatives. For details, see also Table 1.

Key
1 electronic control unit (ECU) 8 sensor flame
2 combustion process 9 sensor flue gas
3 actuator air 10 actuator air feedback
4 actuator fuel 11 actuator fuel feedback
5 sensor air 12 automatic burner control system
6 sensor fuel
7 sensor fuel/air mixture scope of ERC

From the ERC point of view, 12 acts in case a safe state is requested by 1 to de-energize the safety

shut-off valves.
Figure 1 — Scope of the electronic fuel/air ratio control system (ERC)
3.102
electronic fuel/air ratio supervision system
ERS

supervision system consisting of electronic control unit and sensor(s), providing at least one output

signal to indicate if the fuel/air ratio is outside of the safe area of the application

Note 1 to entry: Figure 2 shows an example of different feedback alternatives. For details, see also Table 1.

---------------------- Page: 11 ----------------------
SIST EN 12067-2:2023
EN 12067-2:2022 (E)
Key
1 electronic control unit (ECU) 8 sensor flame
2 combustion process 9 sensor flue gas
3 actuator air 10 actuator air feedback
4 actuator fuel 11 actuator fuel feedback
5 sensor air 12 automatic burner control system
6 sensor fuel 13 arbitrary control
7 sensor fuel/air mixture scope of ERS

From the ERS point of view, 12 acts in case a safe state is requested by 1 to de-energize the safety

shut-off valves.
Figure 2 — Scope of the electronic fuel/air ratio supervision system (ERS)
3.103
electronic fuel/air ratio trim system
ERT

closed loop system consisting of the electronic control unit, actuating element(s) or control output(s) to

influence the fuel/air ratio controlled by other means, and the allocated feedback signal(s)

Note 1 to entry: Figure 3 shows an example of different feedback alternatives. For details, see also

...

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.

---------------------- Page: 1 ----------------------
oSIST prEN 12067-2:2020
---------------------- Page: 2 ----------------------
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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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
...

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