SIST EN 88-3:2022

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.

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SIST EN 88-3:2022

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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.

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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
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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

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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.
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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,
1
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.

1
Under preparation. Stage at the time of publication: FprEN 1854:2022.
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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”.
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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:
st
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.
th
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
2
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

2
As impacted by EN 13611:2019/AC:2021.
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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
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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
p
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
p
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]
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SIST EN 88-3:2022
EN 88-3:2022 (E)
3.108
maximum outlet pressure
p
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
p
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
p
2s
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.
2s
3.112
maximum rated flow rate
q
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
q
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
q
s
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.
s
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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 )
1
2 step response (y )
2
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
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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.
1
[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.
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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
...