Safety and control devices for gas burners and gas burning appliances - Part 3: Pressure and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types

This European Standard specifies the safety, design, construction, and performance requirements and testing of electronic pressure
and/or flow rate regulators (hereafter referred to as ‘regulators’) for burners and appliances burning one or more gaseous fuels. This European Standard is applicable to regulators with declared maximum inlet pressure up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
This European Standard is applicable to
 regulators which use auxiliary energy,
 regulators, which function by controlling a gas outlet pressure or a gas flow rate,
 regulators with a modular structure specified as a unit,
 regulators intended for gas appliances to be installed indoor or in the open air and exposed to the environment.
This European Standard does not  cover regulators connected directly to a gas distribution network or to a container that maintains a standard distribution pressure.

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasbrennstoffgeräte - Teil 3: Druck- und/oder Durchflussregler für Eingangsdrücke bis einschließlich 500 kPa, elektronische Ausführung

Es gilt EN 13611:2019, Abschnitt 1 mit der folgenden Änderung und der folgenden Ergänzung:
Änderung:
Der 1. Absatz von EN 13611:2019, Abschnitt 1, wird durch Folgendes ersetzt:
Dieses Dokument legt die Sicherheits-, Auslegungs-, Konstruktions- und Leistungs¬anforderungen sowie die Prüfung von pneumatischen Druckreglern und Sicherheitseinrichtungen für Brenner und Brennstoffgeräte für einen oder mehrere gasförmige(n) Brennstoff(e) oder flüssige Brennstoffe, die im Folgenden als "Regelgeräte" bezeichnet werden.
Dieses Dokument gilt für Regelgeräte mit einem angegebenen höchsten Eingangsdruck bis einschließlich 500 kPa und mit Anschlussnennweiten bis einschließlich DN 250.
Ergänzung:
Dieses Dokument ist anwendbar auf:
-   Regelgeräte, die Hilfsenergie verwenden;
-   Regelgeräte, mit denen der Gasausgangsdruck oder der Gasdurchfluss geregelt wird;
-   Regelgeräte mit einer modularen Struktur, die als eine Einheit spezifiziert sind;
-   Regelgeräte für Gasgeräte, die in Innenräumen oder im Freien angebracht werden und der Umwelt ausgesetzt sind.
Dieses Dokument ist nicht anwendbar auf:
-   Regelgeräte, die direkt an ein Gasverteilungsnetz oder einen Behälter angeschlossen sind, der einen standardmäßigen Verteilerdruck aufrechterhält.

Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des combustibles gazeux - Partie 3 : Régulateurs de pression et/ou de débit de type électronique pour pression amont inférieure ou égale à 500 kPa

L’article 1 de la norme EN13611 :2019 s’applique avec la modification et l’addition suivantes :
Modification :
Le 1er paragraphe de l’article 1 de la norme EN13611 :2019 est remplacé par ce qui suit :
Le présent document spécifie les exigences en matière de sécurité, de conception, de construction et de performance ainsi que les essais applicables aux régulateurs de pression et/ou de débit de type électronique (désignés ci-après par le terme « régulateurs ») pour brûleurs et appareils utilisant un ou plusieurs combustibles gazeux.
Le présent document s'applique aux régulateurs d'une pression amont maximale déclarée inférieure ou égale à 500 kPa et d'un diamètre nominal de raccordement inférieur ou égal à DN 250.
Addition :
Le présent document est applicable :
-   aux régulateurs utilisant une énergie auxiliaire ;
-   aux régulateurs fonctionnant par modulation d’une pression aval de gaz ou d’un débit de gaz ;
-   aux régulateurs de structure modulaire spécifiés en tant qu'unités ;
-   aux régulateurs destinés à des appareils à gaz qui doivent être installés en intérieur ou en plein air et exposés aux intempéries.
Le présent document ne couvre pas :
- les régulateurs raccordés directement à un réseau de distribution de gaz ou à un récipient qui maintient une pression de distribution normalisée.
Le 4ième paragraphe de l’article 1 de la EN 13611 :2019 est supprimé.

Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 3. del: Regulatorji tlaka in/ali regulatorji pretoka za vstopne tlake do vključno 500 kPa, elektronski tip

General Information

Status
Published
Public Enquiry End Date
02-Jun-2020
Publication Date
14-Nov-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
26-Oct-2022
Due Date
31-Dec-2022
Completion Date
15-Nov-2022

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SLOVENSKI STANDARD
SIST EN 88-3:2022
01-december-2022
Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 3. del:

Regulatorji tlaka in/ali regulatorji pretoka za vstopne tlake do vključno 500 kPa,

elektronski tip

Safety and control devices for gas burners and gas burning appliances - Part 3: Pressure

and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic

types

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasbrennstoffgeräte - Teil 3:

Druck- und/oder Durchflussregler für Eingangsdrücke bis einschließlich 500 kPa,
elektronische Ausführung

Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des

combustibles gazeux - Partie 3 : Régulateurs de pression et/ou de débit de type
électronique pour pression amont inférieure ou égale à 500 kPa
Ta slovenski standard je istoveten z: EN 88-3:2022
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
SIST EN 88-3:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 88-3:2022
---------------------- Page: 2 ----------------------
SIST EN 88-3:2022
EN 88-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 23.060.40
English Version
Safety and control devices for gas burners and gas burning
appliances - Part 3: Pressure and/or flow rate regulators
for inlet pressures up to and including 500 kPa, electronic
types

Dispositifs de sécurité et de contrôle pour les brûleurs Sicherheits- und Regeleinrichtungen für Gasbrenner

à gaz et appareils utilisant des combustibles gazeux - und Gasbrennstoffgeräte - Teil 3: Druck- und/oder

Partie 3 : Régulateurs de pression et/ou de débit de Durchflussregler für Eingangsdrücke bis einschließlich

type électronique pour pression amont inférieure ou 500 kPa, elektronische Ausführung

égale à 500 kPa
This European Standard was approved by CEN on 8 August 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 88-3:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

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

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

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

4 Classification .................................................................................................................................................. 13

4.1 Classes of control .......................................................................................................................................... 13

4.2 Groups of control .......................................................................................................................................... 13

4.3 Classes of control functions ...................................................................................................................... 13

4.4 Types of DC supplied controls ................................................................................................................. 13

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

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

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

6.2 Mechanical parts of the control .............................................................................................................. 14

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

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

6.5 Electrical parts of the control .................................................................................................................. 17

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

7 Performance .................................................................................................................................................. 18

7.1 General ............................................................................................................................................................. 18

7.2 Leak-tightness ............................................................................................................................................... 18

7.3 Torsion and bending ................................................................................................................................... 19

7.4 Rated flow rate .............................................................................................................................................. 19

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

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

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

7.8 Data exchange ............................................................................................................................................... 20

7.101 Regulator performance .............................................................................................................................. 20

7.102 Regulator performance with respect to application safety .......................................................... 27

8 Electrical requirements ............................................................................................................................. 27

8.1 General ............................................................................................................................................................. 27

8.2 Protection by enclosure ............................................................................................................................. 27

8.101 Plug connections........................................................................................................................................... 27

9 Electromagnetic compatibility (EMC) ................................................................................................... 28

9.1 Protection against environmental influences ................................................................................... 28

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 tests .................................................................................................................................. 28

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

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

9.8 Immunity to radiated disturbances induced by radio frequency fields .................................. 28

9.9 Electrostatic discharge tests .................................................................................................................... 28

9.10 Power frequency magnetic field immunity tests .............................................................................. 28

---------------------- Page: 4 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)

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

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

10 Marking, instructions .................................................................................................................................. 28

10.1 Marking ............................................................................................................................................................ 28

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

10.3 Warning notice .............................................................................................................................................. 30

Annex A (informative) Abbreviations and Symbols ...................................................................................... 31

A.1 Abbreviations ................................................................................................................................................. 31

A.2 Symbols ............................................................................................................................................................ 31

Annex B (informative) Leak-tightness test for gas controls – volumetric method ............................ 32

Annex C (informative) Leak-tightness test for gas controls – pressure loss method ........................ 33

Annex D (normative) Calculation of pressure loss into leakage rate ..................................................... 34

Annex E (normative) Electrical/electronic component fault modes ...................................................... 35

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

accessories as defined in EU Directive 2014/68/EU........................................................................ 36

Annex G (normative) Materials for pressurized parts ................................................................................. 37

Annex H (normative) Additional materials for pressurized parts .......................................................... 38

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

appliances burning gaseous or liquid fuels......................................................................................... 39

Annex J (normative) Method for the determination of a Safety integrity level (SIL) ........................ 40

Annex K (normative) Method for the determination of a Performance Level (PL) ........................... 41

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

Level (PL) ......................................................................................................................................................... 42

Annex M (normative) Reset functions ................................................................................................................ 43

Annex N (informative) Guidance document on Environmental Aspects ............................................... 44

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 45

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

requirements of Regulation (EU) 2016/426 aimed to be covered ............................................. 46

Bibliography ................................................................................................................................................................. 49

---------------------- Page: 5 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
European foreword

This document (EN 88-3:2022) 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 April 2023, and conflicting national standards shall be

withdrawn at the latest by October 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 has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of EU

Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part

of this document.
The EN 88 series consists of the following parts:

— EN 88-1, Safety and control devices for gas burners and gas burning appliances — Part 1: Pressure

regulators for inlet pressures up to and including 50 kPa;

— EN 88-2, Safety and control devices for gas burners and gas burning appliances — Part 2: Pressure

regulators for inlet pressures above 50 kPa up to and including 500 kPa;

— EN 88-3, Safety and control devices for gas burners and gas burning appliances — Part 3: Pressure

and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.

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: 6 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
Introduction
This document is intended to be used in conjunction with EN 13611:2019.

EN 13611:2019 recognizes the safety level specified by CEN/TC 58 and is regarded as a horizontal

standard dealing with the safety, construction, performance and testing of controls for burners and

appliances burning gaseous and/or liquid fuels.

The general requirements for controls are given in EN 13611:2019, and methods for classification and

assessment for new controls and control functions are given in EN 14459:2021 (see Figure 1).

EN 126:2012 (see Figure 1) specifies multifunctional controls combining two or more controls and

Application Control Functions, one of which is a mechanical control function. The requirements for

controls and Application Control Functions are given in the specific control standard (see Figure 1,

control functions).
Figure 1 — Interrelation of control standards

EN 13611:2019 should be used in conjunction with the specific standard for a specific type of control (e.g.

EN 88-1:2022, EN 88-2:2022, EN 88-3:2022, EN 125:2022, EN 126:2012, EN 161:2022, EN 257:2022,

EN 298:2022, EN 1106:2022, EN 1643:2022, EN 1854:— , EN 12067-2:2022, EN 16304:2022,

EN 16340:2014, EN 16678:2022 and EN 16898:2022), or for controls for specific applications.

EN 13611:2019 can also be applied, so far as reasonable, to controls not mentioned in a specific standard

and to controls designed on new principles, in which case additional requirements can be necessary.

EN 14459:2021 provides methods for classification and assessment of new control principles.

Primarily in industrial applications it is common practice to rate the safety of a plant based on values

describing the likelihood of a dangerous failure. These values are being used to determine Safety Integrity

Levels or Performance Levels when the system is being assessed in its entirety.

CEN/TC 58 standards for safety relevant controls do go beyond this approach, because for a certain life

time for which the product is specified, designed and tested a dangerous failure is not allowed at all.

Failure modes are described and assessed in greater detail.
Under preparation. Stage at the time of publication: FprEN 1854:2022.
---------------------- Page: 7 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)

Measures to prevent from dangerous situations are defined. Field experience over many decades is

reflected in the CEN/TC 58 standards. Requirements of EN 13611:2019 can be considered as proven in

practice.

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.

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 “regulator”.

---------------------- Page: 8 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
1 Scope
EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1 paragraph of EN 13611:2019, Clause 1 is replaced by:

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

electronic pressure and/or flow rate regulators for burners and appliances burning one or more gaseous

fuels, hereafter referred to as “regulators”.

This document is applicable to regulators with declared maximum inlet pressures up to and including

500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— regulators which use auxiliary energy;

— regulators, which function by controlling a gas outlet pressure or a gas flow rate;

— regulators with a modular structure specified as a unit;

— regulators intended for gas appliances to be installed indoor or in the open air and exposed to the

environment.
This document is not applicable to:

— regulators connected directly to a gas distribution network or to a container that maintains a

standard distribution pressure.
The 4 paragraph of EN 13611:2019, Clause 1 is removed.
2 Normative references

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 161:2022, Automatic shut-off valves for gas burners and gas appliances

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

— General requirements

EN 14459:2021, Safety and control devices for burners and appliances burning gaseous or liquid fuels —

Control functions in electronic systems — Methods for classification and assessment

EN 175301-803:2006, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness,

locking screw not detachable
As impacted by EN 13611:2019/AC:2021.
---------------------- Page: 9 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
3 Terms and definitions

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

apply.

ISO and IEC maintain terminological 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/
3.101
pressure regulator

device which maintains the outlet pressure constant, independent of the variations in inlet pressure

and/or flow rate within defined limits
Note 1 to entry: Examples are shown in Figure 2 and Figure 3.
[SOURCE: EN 88-1:2022, 3.101]
3.102
flow rate regulator

device which maintains the flow rate constant, independent of the variations in inlet pressure and/or

outlet pressure within defined limits
Note 1 to entry: Examples are shown in Figure 2 and Figure 3.
Key
1 rigid pipe
2 internal impulse line
3 gas line
4 sensing element
5 regulating controller including signal conditioner
6 actuator

Figure 2 — Illustration of the components of a pressure and/or flow rate regulator

---------------------- Page: 10 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
Key
1 rigid pipe
2 wire
3 gas line
4 sensing element
5 regulating controller including signal conditioner
6 actuator

Figure 3 — Illustration of the components of a pressure and/or flow rate regulator

3.103
adjustable regulator

regulator provided with means for changing the outlet pressure or flow rate set-point

3.104
control member

moveable part of the regulator which varies flow rate and/or outlet pressure directly

[SOURCE: EN 88-1:2022, 3.107, modified – “pressure” removed]
3.105
maximum inlet pressure
1max

highest inlet pressure, as stated in the instructions, at which the regulator can be operated

[SOURCE: EN 88-1:2022, 3.109, modified – “pressure” removed]
3.106
minimum inlet pressure
1min

lowest inlet pressure, as stated in the instructions, at which the regulator can be operated

[SOURCE: EN 88-1:2022, 3.110, modified – “pressure” removed]
3.107
inlet pressure range

difference between the maximum and minimum values of the inlet pressure, as stated in the instructions

[SOURCE: EN 88-1:2022, 3.108]
---------------------- Page: 11 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
3.108
maximum outlet pressure
2max

upper limit of the outlet pressure, as stated in the instructions, at which the regulator can be operated

[SOURCE: EN 88-1:2022, 3.111, modified – “pressure” removed]
3.109
minimum outlet pressure
2min

lower limit of the outlet pressure, as stated in the instructions, at which the regulator can be operated

[SOURCE: EN 88-1:2022, 3.112, modified – “pressure” removed]
3.110
outlet pressure range

difference between the maximum and minimum values of the outlet pressure, as stated in the instructions

[SOURCE: EN 88-1:2022, 3.113]
3.111
outlet pressure set-point
outlet pressure to which the regulator is set

Note 1 to entry: p can be an electrical signal which is equivalent to a desired pressure set-point.

3.112
maximum rated flow rate
max

upper limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions

[SOURCE: EN 88-1:2022, 3.116]
3.113
minimum rated flow rate
min

lower limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions

[SOURCE: EN 88-1:2022, 3.117]
3.114
rated flow rate range

difference between the maximum and minimum values of the rated air flow rate, corrected to standard

conditions, as stated in the instructions
3.115
rated flow rate set-point
rated flow rate to which the regulator is set

Note 1 to entry: q can be an electrical signal which is equivalent to a desired set flow rate set-point.

---------------------- Page: 12 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
3.116
furnace pressure

pressure of combustion gases from the combustion chamber connected to the regulator

[SOURCE: EN 88-1:2022, 3.126, modified – “pressure” removed]
3.117
signal connection

connection that is used to convey pressure or flow from part of an installation to the electronic pressure

or flow rate sensor (EPS)
3.118
step response

outlet pressure or flow rate change of the regulator having a step change of the outlet pressure or flow

rate set-point signal (e.g. voltage)
Note 1 to entry: For further information refer to Figure 4.
Key
1 step function (y )
2 step response (y )
3 overshoot value
4 settling tolerance
5 steady-state value
6 response time
7 settling time
t time
Figure 4 — Step response of a transfer element
---------------------- Page: 13 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
3.119
steady state value
outlet pressure or flow rate measured after step response remains constant
Note 1 to entry: For further information refer to Figure 4.
Note 2 to entry: Outlet pressure or flow rate set-point signal remains constant.
3.120
settling tolerance

maximum difference between the current outlet pressure or flow rate and its steady state value

Note 1 to entry: For further information refer to Figure 4.
3.121
response time

time counted from start of the step change of the outlet pressure or flow rate set-point signal (e.g. voltage)

until the outlet pressure or flow rate is in the settling tolerance for the first time

Note 1 to entry: For further information refer to Figure 4.
3.122
settling time

time counted from start of the step change of the outlet pressure or flow rate set-point signal until the

outlet pressure or flow rate remains within the settling tolerance
Note 1 to entry: For further information refer to Figure 4.
3.123
overshoot value

largest difference between the outlet pressure or flow rate and its steady state value after step change of

the outlet pressure or flow rate set-point signal exceeding the setting tolerance for the first time

Note 1 to entry: For further information refer to Figure 4.
3.124
withstand pressure

pressure that is withstood without degraded characteristic after returning below the maximum inlet

pressure

Note 1 to entry: The withstand pressure is equal to or higher than the maximum inlet pressure.

[SOURCE: EN 1854:— , 3.115, modified – “at a PSD” removed from the definition and Note 1 to entry

changed]
3.125
electronic pressure or flow rate sensor
EPS

assembly of electronic based pressure or flow rate sensing element and signal conditioner

Note 1 to entry: For further information refer to Figure 5.
---------------------- Page: 14 ----------------------
SIST EN 88-3:2022
EN 88-3:2022 (E)
Key
1 EPS
2 central unit
3 electronic pressure or flow rate sensing element
4 signal conditioner
5 interface
6 output pressure or flow rate signal
Figure 5 — EPS
3.126
electronic pressure or flow rate sensing element

part of the EPS, which transforms the signal to be sensed to another physical value

Note 1 to entry: Sensed values are e.g. pressure or flow rate, other physical values are e.g. force or voltage.

3.127
signal conditioner
transforms the signal from the sensing element into the output signal of the EPS
3.128
reposition

movement of the control member in any direction from one position to the next and back

4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is replaced by the following:
Regulators are not classified.
4.2 Groups of control
Shall be according to EN 13611:2019, 4.2.
4.3 Classes of control functions
Shall be according to EN 13611:2019, 4.3.
4.4 Types of DC
...

SLOVENSKI STANDARD
oSIST prEN 88-3:2020
01-maj-2020
Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 3. del:

Regulatorji tlaka in/ali regulatorji pretoka za vstopne tlake do vključno 500 kPa,

elektronski tip

Safety and control devices for gas burners and gas burning appliances - Part 3: Pressure

and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic

types

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasbrennstoffgeräte - Teil 3:

Druck- und/oder Durchflussregler für Eingangsdrücke bis einschließlich 500 kPa,
elektronische Ausführung

Équipements auxiliaires pour brûleurs à gaz et appareils à gaz - Partie 3 - Régulateurs

de pression et/ou de débit électroniques pour pression amont inférieure ou égale à 500

kPa Élément complémentaire
Ta slovenski standard je istoveten z: prEN 88-3
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 88-3:2020 en,fr,de

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

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oSIST prEN 88-3:2020
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oSIST prEN 88-3:2020
DRAFT
EUROPEAN STANDARD
prEN 88-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 23.060.40
English Version
Safety and control devices for gas burners and gas burning
appliances - Pressure and/or flow rate regulators for inlet
pressures up to and including 500 kPa, electronic types
Sicherheits- und Regeleinrichtungen für Gasbrenner
und Gasbrennstoffgeräte - Druck- und/oder
Durchflussregler für Eingangsdrücke bis einschließlich
500 kPA, elektronische Ausführung

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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 88-3:2020 E

worldwide for CEN national Members.
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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
Contents Page

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

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

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

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

3 Terms and definitions .............................................................................................................................. 7

4 Classification ............................................................................................................................................ 13

4.1 Classes of control .................................................................................................................................... 13

4.2 Groups of control .................................................................................................................................... 13

4.3 Classes of control functions................................................................................................................. 13

4.4 Types of DC supplied controls ............................................................................................................ 13

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

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

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

6.2 Mechanical parts of the control ......................................................................................................... 14

6.2.1 Appearance ............................................................................................................................................... 14

6.2.2 Holes ............................................................................................................................................................ 14

6.2.3 Breather holes ......................................................................................................................................... 14

6.2.4 Screwed fastenings ................................................................................................................................. 15

6.2.5 Jointing ....................................................................................................................................................... 15

6.2.6 Moving parts ............................................................................................................................................. 15

6.2.7 Sealing caps ............................................................................................................................................... 15

6.2.8 Dismantling and reassembly .............................................................................................................. 15

6.2.9 Auxiliary canals and orifices ............................................................................................................... 15

6.2.10 Presetting device..................................................................................................................................... 15

6.2.101 Adjustments .............................................................................................................................................. 15

6.2.102 Resistance to pressure .......................................................................................................................... 15

6.2.103 Blockage of canals and orifices .......................................................................................................... 16

6.2.104 Signal tube connections ........................................................................................................................ 16

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

6.3.1 General material requirements ......................................................................................................... 16

6.3.2 Housing ....................................................................................................................................................... 16

6.3.3 Zinc alloys .................................................................................................................................................. 16

6.3.4 Springs ........................................................................................................................................................ 16

6.3.5 Resistance to corrosion and surface protection .......................................................................... 16

6.3.6 Impregnation ............................................................................................................................................ 16

6.3.7 Seals for glands for moving parts ...................................................................................................... 16

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

6.4.1 Making connections ............................................................................................................................... 16

6.4.2 Connection sizes ...................................................................................................................................... 16

6.4.3 Threads ....................................................................................................................................................... 17

6.4.4 Union joints ............................................................................................................................................... 17

6.4.5 Flanges ........................................................................................................................................................ 17

6.4.6 Compression fittings .............................................................................................................................. 17

6.4.7 Nipples for pressure test ...................................................................................................................... 17

6.4.8 Strainers ..................................................................................................................................................... 17

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6.5 Electrical parts of the control ............................................................................................................. 17

6.5.1 General ........................................................................................................................................................ 17

6.5.2 Switching elements ................................................................................................................................. 17

6.5.3 Electrical Components ........................................................................................................................... 17

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 .......................................................................................................................................................... 18

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

6.6.5 Circuit and construction evaluation ................................................................................................. 18

7 Performance .............................................................................................................................................. 18

7.1 General ........................................................................................................................................................ 18

7.2 Leak tightness ........................................................................................................................................... 18

7.2.1 Requirements ........................................................................................................................................... 18

7.2.2 Tests ............................................................................................................................................................. 18

7.3 Torsion and bending .............................................................................................................................. 19

7.3.1 General ........................................................................................................................................................ 19

7.3.2 Torsion and bending moments .......................................................................................................... 19

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

7.4.1 Requirement ............................................................................................................................................. 20

7.4.2 Test ............................................................................................................................................................... 20

7.4.3 Conversion of air flow rate................................................................................................................... 20

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

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

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

7.8 Data exchange ........................................................................................................................................... 20

7.101 Regulator performance ......................................................................................................................... 20

7.101.1 General ........................................................................................................................................................ 20

7.101.2 General test procedure.......................................................................................................................... 20

7.101.3 Pressure regulator performance and stability ............................................................................. 22

7.101.4 Flow rate regulator performance and stability ............................................................................ 23

7.101.5 Settling time .............................................................................................................................................. 25

7.101.6 Endurance .................................................................................................................................................. 26

7.102 Regulator performance with respect to application safety ..................................................... 27

8 Electrical requirements ........................................................................................................................ 27

8.1 General ........................................................................................................................................................ 27

8.2 Protection by enclosure ........................................................................................................................ 27

8.101 Electrical equipment .............................................................................................................................. 27

9 Electromagnetic compatibility (EMC) .............................................................................................. 27

9.1 Protection against environmental influences............................................................................... 27

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 tests ............................................................................................................................. 27

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

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

9.8 Immunity to radiated fields induced by radio frequency fields ............................................. 28

9.9 Electrostatic discharge tests ............................................................................................................... 28

9.10 Power frequency magnetic field immunity tests ......................................................................... 28

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

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

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10 Marking, instructions ............................................................................................................................ 28

10.1 Marking ...................................................................................................................................................... 28

10.2 Instructions ............................................................................................................................................... 28

10.3 Warning notice ........................................................................................................................................ 30

Annex A (informative) Abbreviations and Symbols ..................................................................................... 31

Annex B (informative) Leak-tightness test for gas controls — volumetric method ......................... 32

Annex C (informative) Leak-tightness test for gas controls — pressure loss method ..................... 33

Annex D (normative) Conversion of pressure loss into leakage rate ..................................................... 34

Annex E (normative) Electrical/electronic component fault modes ...................................................... 35

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

accessories as defined in EC Directive 2014/68/EC ................................................................. 36

Annex G (normative) Materials for pressurized parts ................................................................................. 37

Annex H (normative) Additional materials for pressurized parts .......................................................... 38

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

appliances burning gaseous or liquid fuels ................................................................................. 39

Annex J (normative) Method for the determination of a Safety integrity level (SIL) ....................... 40

Annex K (normative) Method for the determination of a Performance level (PL) ............................ 41

Annex L (informative) Relationship between Safety integrity level (SIL) and Performance

level (PL) .................................................................................................................................................. 42

Annex M (normative) Reset functions ............................................................................................................... 43

Annex N (informative) Guidance document on Environmental Aspects ............................................... 44

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 45

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

requirements of Regulation (EU) 2016/426 aimed to be covered ..................................... 46

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

requirements of Directive 2014/68/EU aimed to be covered .............................................. 51

Bibliography ................................................................................................................................................................. 55

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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
European foreword

This document (prEN 88-3:2020) 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 has been prepared under a standardization request 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 an integral part of

this document.

EN 88 Pressure regulators and associated safety devices for gas appliances consist of the following parts:

— EN 88-1, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure

regulators for inlet pressures up to and including 50 kPa;

— EN 88-2, Pressure regulators and associated safety devices for gas appliances — Part 2: Pressure

regulators for inlet pressures above 500 mbar up to and including 5 bar;

— EN 88-3, Safety and control devices for gas burners and gas burning appliances — Part 3: Pressure

and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.

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oSIST prEN 88-3:2020
prEN 88-3:2019 (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. It should be noted that these clauses and subclauses are not indicated as an addition.

Subclauses or annexes which are additional to those in EN 13611:2019 are numbered starting from 101

or are designated as Annex AA, BB, CC etc.
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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
1 Scope

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

electronic pressure and/or flow rate regulators (hereafter referred to as ‘regulators’) for burners and

appliances burning one or more gaseous fuels. This document is applicable to regulators with declared

maximum inlet pressure up to and including 500 kPa and of nominal connection sizes up to and

including DN 250.
This document is applicable to
— regulators which use auxiliary energy,

— regulators, which function by controlling a gas outlet pressure or a gas flow rate,

— regulators with a modular structure specified as a unit,

— regulators intended for gas appliances to be installed indoor or in the open air and exposed to the

environment.

This document does not cover regulators connected directly to a gas distribution network or to a

container that maintains a standard distribution pressure.
2 Normative references

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 161:2011+A3:2013, Automatic shut-off valves for gas burners and gas appliances

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

fuels — General requirements

EN 175301-803, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness, locking

screw not detachable
3 Terms and definitions

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

apply.

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

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.101
pressure regulator

device which maintains the outlet pressure constantly, independently of the variations of inlet pressure

and/or flow rate and within defined limits
Note 1 to entry: Examples are shown in Figure 1 and Figure 2.
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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
3.102
flow rate regulator

device which maintains the flow rate constantly, independently of the variations of inlet pressure

and/or outlet pressure and within defined limits
Note 1 to entry: Examples are shown in Figure 1 and Figure 2.
Key
1 Rigid pipe
2 Internal impulse line
3 Sensing element
4 Regulating controller including signal conditioner
5 Gas line
6 Actuator

Figure 1 — Illustration of the components of a pressure and/or flow rate regulator

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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
Key
1 Rigid pipe
2 Wire
3 Sensing element
4 Regulating controller including signal conditioner
5 Gas line
6 Actuator

Figure 2 — Illustration of the components of a pressure and/or flow rate regulator

3.103
adjustable regulator

regulator provided with means for changing the outlet pressure or flow rate set point

3.104
control member

moveable part of the regulator which varies flow rate and/or outlet pressure directly

3.105
minimum inlet pressure
umin
lower limit of the inlet pressure, as stated in the instructions
3.106
maximum inlet pressure
umax
upper limit of the inlet pressure, as stated in the instructions
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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
3.107
inlet pressure range

difference between the maximum and minimum values of the inlet pressure, as stated in the

instructions
3.108
minimum outlet pressure
dmin
lower limit of the outlet pressure, as stated in the instructions
3.109
maximum outlet pressure
dmax
upper limit of the outlet pressure, as stated in the instructions
3.110
outlet pressure range

difference between maximum and minimum values of the outlet pressure, as stated in the instructions

3.111
outlet pressure set-point
outlet pressure to which the regulator is set

Note 1 to entry: p can be an electrical signal which is equivalent to a desired set pressure.

3.112
minimum rated flow rate
min
lower limit of the rated flow rate, as stated in the instructions
3.113
maximum rated flow rate
max
upper limit of the rated flow rate, as stated in the instructions
3.114
rated flow rate range

difference between the maximum and minimum values of the rated flow rate, as stated in the

instructions
3.115
rated flow rate set-point
rated flow rate to which the regulator is set

Note 1 to entry: q can be an electrical signal which is equivalent to a desired set flow rate.

3.116
furnace pressure

pressure of combustion gases from the combustion chamber connected to the regulator

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oSIST prEN 88-3:2020
prEN 88-3:2019 (E)
3.117
signal connection

connection that is used to convey pressure or flow from part of an installation to the EPS

3.118
step response

outlet pressure or flow rate change of the regulator having a step change of the outlet pressure or flow

rate set-point signal (e.g. voltage)
Note 1 to entry: For further information refer to Figure 3.
Key
1 step function (y )
2 step response (y )
3 overshoot value
4 settling tolerance
5 steady-state value
6 response time
7 settling time
t time
Figure 3 — Step response of a transfer element
3.119
steady state value
outlet pressure or flow rate measured after step response
...

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