oSIST prEN 88-3:2020

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

Dieses Dokument legt die Sicherheits-, Planungs-, Konstruktions- und Leistungsanforderungen sowie die Prüfungen von elektronischen Druck- und/oder Durchflussreglern (im Folgenden als „Regelgeräte“ bezeichnet) für Brenner und Geräte fest, die ein oder mehr gasförmige Brennstoffe verbrennen. Dieses Dokument ist anwendbar auf Regelgeräte mit einem angegebenen maximalen Eingangsdruck bis einschließlich 500 kPa mit Nennanschlussgrößen bis einschließlich DN 250.
Dieses Dokument gilt für:
-   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 gilt nicht für Regelgeräte, die direkt an ein Gasverteilungsnetz oder einen Behälter angeschlossen sind, der einen standardmäßigen Verteilerdruck aufrechterhält.

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

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.
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.

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: Not Published
• Public Enquiry End Date: 02-Jun-2020
• ICS: 23.060.40 - Pressure regulators
• ICS: 27.060.20 - Gas fuel burners
• Technical Committee: PLN - Gas appliances for domestic use
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 07-Apr-2020
• Due Date: 25-Aug-2020
• Completion Date: 24-Jun-2020
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Ref Project: FprEN 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

RELATIONS

• Revised: oSIST prEN 88-3:2017 - 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
• Effective Date: 01-May-2020

Standards Content (sample)

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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prEN 88-3:2019 (E)

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
...