oSIST prEN 12067-2:2016

SLOVENSKI STANDARD
oSIST prEN 12067-2:2016
01-januar-2016
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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
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 à gaz ou fioul -
Dispositifs électroniques de régulation - Partie 2 rév : Régulation et surveillance du
rapport air/combustible de type électronique
Ta slovenski standard je istoveten z: prEN 12067-2 rev
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
oSIST prEN 12067-2:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12067-2:2016

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oSIST prEN 12067-2:2016


DRAFT
EUROPEAN STANDARD
prEN 12067-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2015
ICS 23.060.40; 27.060.20 Will supersede 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 à gaz ou fioul - Dispositifs Brennstoffgeräte für gasförmige oder flüssige
électroniques de régulation - Partie 2 rév : Régulation Brennstoffe - Regel- und Steuerfunktionen in
et surveillance du rapport air/combustible de type elektronischen Systemen - Teil 2: Elektronische Gas-
électronique Luft-Verbundregel- und überwachungseinrichtungen
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12067-2:2015 E
worldwide for CEN national Members.

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prEN 12067-2:2015 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
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 . 14
6.1 General . 14
6.1.101 General structure and feedback types . 14
6.2 Mechanical parts of the control . 15
6.2.101 Use of non-metallic material . 15
6.2.102 Special requirements for electromechanical actuators with position feed-back
sensors . 15
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 . 16
6.6.1 Design and construction requirements . 16
6.6.2 Class A . 16
6.6.3 Class B . 16
6.6.4 Class C . 17
6.6.5 Circuit and construction evaluation . 18
7 Performance . 18
7.1 General . 18
7.2 Leak-tightness . 18
7.3 Torsion and bending . 18
7.4 Rated flow rate . 18
7.5 Durability . 18
7.6 Performance tests for electronic controls . 18
7.6.1 At ambient temperature . 18
7.6.2 At minimum temperature . 18
7.6.3 At maximum temperature . 18
7.7 Long-term performance for electronic controls . 19
7.7.1 General . 19
7.7.1.101 Test requirements . 19
7.7.1.102 Test conditions . 19
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7.7.2 Stress test . 20
7.7.3 Long term performance test . 20
7.8 Data exchange . 20
7.101 Functional requirements . 20
7.101.1 General . 20
7.101.2 Interface to the automatic burner control system . 21
7.101.3 Void . 21
7.101.4 Ranges of operation . 21
7.101.5 Restart from safe state . 22
7.101.6 Accuracy requirements . 23
8 Electrical requirements . 23
8.1 General . 23
8.2 Protection by enclosure . 23
9 Electromagnetic compatibility (EMC) . 23
9.1 Protection against environmental influences . 23
9.2 Supply voltage variations below 85 % of rated voltage. 24
9.3 Voltage dips and interruptions . 24
9.4 Supply frequency variations . 24
9.5 Surge immunity test . 24
9.6 Electrical fast transient/burst . 25
9.7 Immunity to conducted disturbances induced by radio frequency fields . 25
9.8 Immunity to radiated fields induced by radio frequency fields . 25
9.9 Electrostatic discharge test . 25
9.10 Power frequency magnetic field immunity test . 26
9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low
frequency immunity tests . 26

10 Marking, installation and operating instructions . 26
10.1 Marking . 26
10.2 Installation and operating instructions . 26
10.3 Warning Notice . 28
10.101 Technical information for the safety after integration in the appliance . 28
Annex A (informative) Abbreviations and Symbols . 29
Annex B (informative) Leak-tightness test for gas controls − Volumetric method . 30
Annex C (informative) Leak-tightness for gas controls − Pressure loss method . 31
Annex D (normative) Calculation of pressure loss into leakage rate . 32
Annex E (normative) Electrical/electronic component fault modes . 33
Annex F (normative) Additional requirements for safety accessories and pressure
accessories as defined in EU 97/23/EC. 34
Annex G (normative) Materials for pressurized parts . 35
Annex H (informative) Additional materials for pressurized parts . 36
Annex I (normative) Requirements for controls used in DC supplied burners and
appliances burning gaseous or liquid fuels. 37
Annex J (normative) Method for the determination of a Safety integrity level (SIL) . 38
Annex K (normative) Method for the determination of a Performance Level (PL) . 39
Annex L (informative) Relationship between Safety Integrity Level (SIL) and Performance
Level (PL) . 40
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Annex M (normative) Reset functions . 41
Annex N (informative) Guidance document on Environmental Aspects . 42
Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures. 43
Annex AA (normative) Declaration for sensors, actuators and repeatability . 44
Annex BB (normative) Special requirements for single position feed-back potentiometers
in electromechanical actuators . 48
Annex CC (informative) Overall fuel to air ratio accuracy . 49
Annex DD (informative) Guideline for the integration of an ERC, ERS or ERT into the
appliance . 50
Annex EE (informative) Guideline for the definition of limits for safe operation of the
appliance . 52
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous
fuels . 58
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC concerning pressure equipment . 60
Bibliography . 61
Figure
Figure 1 — Scope of the electronic fuel/air ratio control (ERC) . 9
Figure 2 — Scope of the electronic fuel/air ratio supervision (ERS) . 10
Figure 3 — Scope of the electronic fuel/air ratio trim (ERT) . 11
Figure 4 — Fault tolerating time (FTT) . 12
Figure 5 — Fault reaction time control for ERC and ERS . 12
Figure 6 — Fault reaction time control for ERT . 13
Figure 7 — Fault reaction time control for ERC and ERS . 22
Offset Figure AA.1 — Informative graph for definitions . 44
Figure EE.1 — Maximum permissible concentration of combustible substances [from EN 1539] . 54
Figure EE.2 — Test room dimensions . 56
Table
Table 1 — Acceptable feedback types . 15
Table AA.1 — Declaration for sensors . 45
Table AA.2 — Declaration for actuators . 46
Table AA.3 — Declaration for accuracy . 47
Table CC.1 — Tolerances . 49
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Table DD.1 — Responsibility matrix . 51
Table EE.1 — Example of lower explosion limits (LEL) and ignition temperatures for different
combustibles. . 53
Table EE.2 — Maximum leakage rate (Source: EN 15502-2-1: Table 102 Maximum admissible leakage
rates) . 57
Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to
appliances burning gaseous fuels . 58

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European foreword
This document (prEN 12067-2:2015) 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 13611:2015;
b) integration of the requirements for fuel to air ratio using oil as the fuel;
c) addition of the control types ERS and ERT and
d) updating to IEC 60730-1:2013;
e) update requirements for fault reaction time and fault tolerating time;
f) updating the Annexes for Sensors and actors;
g) including the use of pressure sensing devices already complying with EN 1854;
h) new Annex “Guideline for the integration of ERC, ERS or ERT into the appliances;
i) new Annex “Guideline for the definition of limits for safe operation on the appliance.
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Introduction
This standard recognizes the safety level 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 13611:2015-07 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 sub-clauses to the structure of EN 13611:2015-07 which are
particular to this standard (prEN 12067-2:2015). Additional sub-clauses or annexes are either
numbered starting from 101 or are designated as Annex AA, BB, CC etc. It should be noted however that
these clauses and sub-clauses are not indicated as additions in the text.
EN 12067-2 compliance for electronic fuel/air ratio control cannot be claimed based upon SIL
classification according to EN 61508.
SIL classification cannot be claimed based upon compliance with this standard only. A supplementary
method for SIL determination is specified in EN 13611:2015, Annex J.
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1 Scope
EN 13611:2015, 1 shall be replaced by the following:
This European Standard specifies the safety, construction and performance requirements for electronic
fuel/air ratio control (ERC), electronic fuel/air ratio supervision (ERS) and electronic fuel/air ratio trim
(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 controls, 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.
This European Standard applies to ERC, ERS or ERT that can be tested independently, as well as part of
an appliance or a burner.
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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 88-1:2011, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa;
EN 298:2012, Automatic burner control systems for burners and appliances burning gaseous or liquid
fuels
EN 16340:2014, Safety and control devices for burners and appliances burning gaseous or liquid fuels —
Combustion product sensing devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13611:2015 and the following
apply.
3.101
electronic fuel/air ratio control (ERC)
closed loop modulating system consisting of the electronic control, 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.
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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
Figure 1 — Scope of the electronic fuel/air ratio control (ERC)
3.102
electronic fuel/air ratio supervision (ERS)
supervision system consisting of electronic and sensor(s), providing at least one output signal to
indicate if the combustion process is in safe state or not
Note 1 to entry: Figure 2 shows an example of different feedback alternatives. For details, see also Table 1.
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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 ERC
Figure 2 — Scope of the electronic fuel/air ratio supervision (ERS)
3.103
electronic fuel/air ratio trim (ERT)
closed loop system consisting of the electronic trim control, actuating element(s) or control output to
influence the fuel air ratio controlled by other means and the allo
...