FprEN 88-3
(Main)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
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 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.
Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasbrennstoffgeräte - Teil 3: Druck- und/oder Durchflussregler für Eingangsdrücke bis einschließlich 500 kPA, elektronische Ausführung
Diese Europäische Norm legt die Sicherheits-, Planungs-, Konstruktions- und Leistungsanforderungen sowie die Prüfungen für elektronische Druck- und Durchflussregler für Brenner und Geräte fest, die ein oder mehr gasförmige Brennstoffe verbrennen und im weiteren Verlauf als "Regelgerät" bezeichnet.
Diese Europäische Norm gilt für:
- Regelgeräte mit einem angegebenen maximalen Eingangsdruck bis einschließlich 500 kPa mit Nennanschlussgrößen bis einschließlich DN 250;
- Regelgeräte, die Hilfsenergie verwenden;
- Regelgeräte, mit denen der Gasausgangsdruck oder der Gasdurchfluss geregelt wird;
- Regelgeräte mit einer modularen Struktur, die als eine Einheit zugelassen sind;
- Regelgeräte für Gasgeräte, die im Freien angebracht werden und der Umwelt ausgesetzt sind.
Diese Europäische Norm gilt nicht für:
- Regelgeräte, die direkt an ein Gasverteilungsnetz oder einen Behälter angeschlossen sind, der einen standardmäßigen Verteilerdruck aufrechterhält;
- elektronische Brennstoff-Luft-Verbundregler (siehe EN 12067-2).
ANMERKUNG EN 12067-2 gilt für Regler, die Teil eines elektronischen Brennstoff-Luft-Verbundsystems sind.
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
La présente Norme européenne spécifie les exigences et essais de sécurité, de conception, de construction et de fonctionnement relatifs aux régulateurs de pression et/ou de débit électroniques pour brûleurs et appareils utilisant un ou plusieurs combustibles gazeux, dénommés ci-après « régulateurs ».
La présente Norme européenne peut être appliquée :
- 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 ;
- 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 certifiés en tant qu'unités ;
- aux régulateurs destinés à des appareils à gaz qui doivent être installés en plein air et exposés aux intempéries.
La présente Norme européenne 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 ;
- les dispositifs électroniques de régulation du rapport air/combustible (EN 12067-2).
NOTE L’EN 12067-2 s’applique aux régulateurs intégrés à un système électronique de régulation du rapport air/combustible.
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
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2017
9DUQRVWQHLQQDG]RUQHQDSUDYH]DSOLQVNHJRULOQLNHLQSOLQVNHDSDUDWHGHO
5HJXODWRUMLWODNDLQDOLUHJXODWRUMLSUHWRND]DYVWRSQHWODNHGRYNOMXþQRN3D
HOHNWURQVNLWLS
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 7ODþQLUHJXODWRUML Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 88-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2017
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
Équipements auxiliaires pour brûleurs à gaz et Sicherheits- und Regeleinrichtungen für Gasbrenner
appareils à gaz - Partie 3 - Régulateurs de pression und Gasbrennstoffgeräte - Teil 3: Druck- und/oder
et/ou de débit électroniques pour pression amont Durchflussregler für Eingangsdrücke bis einschließlich
inférieure ou égale à 500 kPa Élément complémentaire 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 88-3:2017 E
worldwide for CEN national Members.
prEN 88-3:2017 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Classification . 12
4.1 Classes of control . 12
4.2 Groups of control . 12
4.3 Classes of control functions . 12
4.4 Types of DC supplied controls . 12
5 Test conditions and uncertainty of measurements . 12
6 Design and construction . 12
6.1 General . 12
6.2 Mechanical parts of the control . 12
6.2.1 Appearance . 12
6.2.2 Holes . 12
6.2.3 Breather holes . 13
6.2.4 Screwed fastenings . 13
6.2.5 Jointing . 13
6.2.6 Moving parts . 13
6.2.7 Sealing caps . 13
6.2.8 Dismantling and reassembly . 13
6.2.9 Auxiliary canals and orifices . 14
6.2.10 Presetting device . 14
6.2.101 Adjustments . 14
6.2.102 Resistance to pressure . 14
6.2.103 Blockage of canals and orifices . 14
6.2.104 Signal tube connections . 14
6.3 Materials . 14
6.3.1 General material requirements . 14
6.3.2 Housing . 14
6.3.3 Zinc alloys . 14
6.3.4 Springs . 14
6.3.5 Resistance to corrosion and surface protection . 15
6.3.6 Impregnation . 15
6.3.7 Seals for glands for moving parts . 15
6.4 Gas connections . 15
6.4.1 Making connections. 15
6.4.2 Connection sizes . 15
6.4.3 Threads . 15
6.4.4 Union joints . 15
6.4.5 Flanges . 15
6.4.6 Compression fittings . 15
6.4.7 Nipples for pressure test . 15
6.4.8 Strainers . 15
6.5 Electrical parts of the control . 15
prEN 88-3:2017 (E)
6.5.1 General . 15
6.5.2 Switching elements . 16
6.5.3 Electrical Components . 16
6.6 Protection against internal faults for the purpose of functional safety . 16
6.6.1 Design and construction requirements . 16
6.6.2 Class A . 16
6.6.3 Class B . 16
6.6.4 Class C . 16
6.6.5 Circuit and construction evaluation . 16
7 Performance . 16
7.1 General . 16
7.2 Leak tightness . 16
7.2.1 Requirements . 16
7.2.2 Tests . 17
7.3 Torsion and bending . 17
7.3.1 General . 17
7.3.2 Torsion and bending moments . 17
7.4 Rated flow rate . 18
7.4.1 Requirement . 18
7.4.2 Test . 18
7.4.3 Conversion of air flow rate . 18
7.5 Durability. 18
7.6 Performance tests for electronic controls . 18
7.7 Long-term performance for electronic controls . 18
7.8 Data exchange . 18
7.101 Regulator performance . 18
7.101.1 General . 18
7.101.2 General test procedure . 19
7.101.3 Pressure regulator performance and stability . 20
7.101.4 Flow rate regulator performance and stability . 22
7.101.5 Settling time . 23
7.101.6 Endurance . 24
7.102 Regulator performance with respect to application safety . 25
8 Electrical requirements . 25
8.1 General . 25
8.2 Protection by enclosure . 25
8.101 Electrical equipment . 26
9 Electromagnetic compatibility (EMC) . 26
9.1 Protection against environmental influences . 26
9.2 Supply voltage variations below 85 % of rated voltage. 26
9.3 Voltage dips and interruptions . 26
9.4 Supply frequency variations . 26
9.5 Surge immunity tests . 26
9.6 Electrical fast transient/burst . 26
9.7 Immunity to conducted disturbances induced by radio frequency fields . 26
9.8 Immunity to radiated fields induced by radio frequency fields . 26
9.9 Electrostatic discharge tests . 26
9.10 Power frequency magnetic field immunity tests . 26
9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low
frequency immunity tests . 27
10 Marking, installation and operating instructions . 27
prEN 88-3:2017 (E)
10.1 Marking . 27
10.2 Installation and operating instructions . 27
10.3 Warning notice . 29
Annex A (informative) Abbreviations and symbols . 30
Annex B (informative) Leak-tightness test for gas controls — volumetric method . 31
Annex C (informative) Leak-tightness test for gas controls — pressure loss method . 32
Annex D (normative) Conversion of pressure loss into leakage rate. 33
Annex E (normative) Electrical/electronic component fault modes . 34
Annex F (normative) Additional requirements for safety accessories and pressure
accessories as defined in EC Directive 2014/68/EC . 35
Annex G (normative) Materials for pressurized parts. 36
Annex H (normative) Additional materials for pressurized parts . 37
Annex I (normative) Requirements for controls used in DC supplied burners and appliances
burning gaseous or liquid fuels . 38
Annex J (normative) Method for the determination of a Safety integrity level (SIL) . 39
Annex K (normative) Method for the determination of a Performance level (PL) . 40
Annex L (informative) Relationship between Safety integrity level (SIL) and Performance
level (PL) . 41
Annex M (normative) Reset functions . 42
Annex N (informative) Guidance document on environmental aspects . 43
Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures . 44
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2009/142/EC aimed to be covered . 45
Annex ZB (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 aimed to be covered . 48
Annex ZC (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU aimed to be covered . 51
Bibliography . 54
prEN 88-3:2017 (E)
European foreword
This document (prEN 88-3:2017) 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 Regulation(s)/Directive(s).
For relationship with EU Regulation(s)/Directive(s), see informative Annexes ZA, ZB, or ZC, which are
an integral part of this document.
This document is intended to be used in conjunction with EN 13611:2015. This document refers to
clauses of EN 13611:2015 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 European Standard adds clauses or subclauses to the structure of EN 13611:2015 which are
particular to this European Standard. 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 13611:2015 are
numbered starting from 101 or are designated as Annex AA, BB, CC, etc.
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 50 kPa up to and including 500 kPa and associated safety devices;
— EN 88-3, Pressure regulators and associated safety devices for gas appliances — Part 3: Pressure
and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.
prEN 88-3:2017 (E)
1 Scope
This European Standard 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 European Standard is applicable to:
— regulators with declared maximum inlet pressures up to and including 500 kPa with nominal
connection sizes up to and including DN 250;
— regulators which use auxiliary energy;
— regulators, which function by controlling a gas outlet pressure or a gas flow rate;
— regulators with a modular structure approved as a unit;
— regulators intended for gas appliances to be installed 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;
— electronic fuel/air ratio controls (see EN 12067-2).
NOTE EN 12067–2 is applicable to regulators being part of an electronic fuel/air ratio system.
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 13611:2015, Safety and control devices for burners and appliances burning gaseous and/or liquid
fuels - General requirements
EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60529:1991/A1:2000, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60529:1991/A2:2013, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 175301-803:2006, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness,
locking screw not detachable
EN 1854:2010, Pressure sensing devices for gas burners and gas burning appliances
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13611:2015 and the following
apply.
prEN 88-3:2017 (E)
3.101
pressure regulator
device which maintains the outlet pressure constant, independent of the variations of inlet pressure
and/or flow rate, within defined limits
3.102
flow rate regulator
device which maintains the flow rate constant, independent of the variations of inlet pressure and/or
outlet pressure, 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 gas line
E Electronic
S Sensing element
A Actuator
Figure 1 — Illustration of the components of a pressure and/or flow rate regulator
prEN 88-3:2017 (E)
Key
1 rigid pipe
2 wire
3 gas line
E Electronic
S Sensing element
A 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
p
umin
lower limit of the inlet pressure, as stated in the installation and operating instructions
3.106
maximum outlet pressure
p
umax
upper limit of the inlet pressure, as stated in the installation and operating instructions
3.107
inlet pressure range
difference between the maximum and minimum values of the inlet pressure, as stated in the installation
and operating instructions
3.108
minimum outlet pressure
p
dmin
lower limit of the outlet pressure, as stated in the installation and operating instructions
3.109
maximum outlet pressure
p
dmax
upper limit of the outlet pressure, as stated in the installation and operating instructions
prEN 88-3:2017 (E)
3.110
outlet pressure range
difference between minimum and maximum values of the outlet pressure, as stated in the installation
and operating instructions
3.111
outlet pressure set-point
p
ds
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
ds
3.112
minimum rated flow rate
q
min
lower limit of the rated flow rate, as stated in the installation and operating instructions
3.113
maximum rated flow rate
q
max
upper limit of the rated flow rate, as stated in the installation and operating instructions
3.114
rated flow rate range
difference between the maximum and minimum values of the rated flow rate, as stated in the
installation and operating 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.
s
3.116
furnace pressure
pressure of combustion gases from the combustion chamber connected to the regulator
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.
prEN 88-3:2017 (E)
Key
1 step function (y1)
2 step response (y2)
3 overshoot value
4 settling tolerance
5 steady-state value
6 response time
7 settling time
t time
Figure 1 —Step response of a transfer element
3.119
steady state value
outlet pressure or flow rate measured after step response (outlet pressure or flow rate set-point signal
remains constant)
3.120
setting tolerance
maximum difference between the current outlet pressure or flow rate and its steady state value
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 within the settling tolerance for the first time
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
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
prEN 88-3:2017 (E)
3.124
withstand pressure
pressure that is withstood without degraded characteristic after returning below the maximum inlet
pressure
[EN 1854:2010, 3.116]
Note 1 to entry: The withstand pressure is equal to or higher than the maximum inlet pressure.
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: Figure 4, clarifies the EPS.
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 4 — EPS
3.126
electronic pressure or flow rate sensing element
part of the EPS, which transforms the signal to be sensed (e.g. pressure or flow rate) to another physical
value (e.g. force, 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
prEN 88-3:2017 (E)
4 Classification
4.1 Classes of control
EN 13611:2015, 4.1 is replaced by the following:
Regulators are not classified.
4.2 Groups of control
Shall be according to EN 13611:2015, 4.2.
4.3 Classes of control functions
Shall be according to EN 13611:2015, 4.3.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2015, 4.4.
5 Test conditions and uncertainty of measurements
Shall be according to EN 13611:2015, Clause 5.
6 Design and construction
6.1 General
Shall be according to EN 13611:2015, 6.1 with the following addition:
The overall functional safety of the regulator shall be according to the functional safety class B.
The withstand pressure shall be stated in the installation and operating instructions. If no withstand
pressure is stated, the withstand pressure is equal to the maximum inlet pressure.
Regulators intended for gas appliances to be installed in the open air and exposed to the environment
shall be suitably protected to prevent malfunction according to e.g. (non-exhaustive list):
— blocking of breather holes by icing or water;
— requirements for IP codes (EN 60529:1991 + EN 60529:1991/A1:2000 +
EN 60529:1991/A2:2013);
— requirements for aging according to UV radiation.
Protection can also be achieved by the appliance or by additional measures, which shall be stated in the
installation and operating instructions.
6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to EN 13611:2015, 6.2.1.
6.2.2 Holes
Shall be according to EN 13611:2015, 6.2.2 with the following modification:
This requirement only applies to gas-carrying compartments.
prEN 88-3:2017 (E)
6.2.3 Breather holes
6.2.3.1 Requirements
Shall be according to EN 13611:2015, 6.2.3.1 with the following modification and addition:
Use the withstand pressure instead of the maximum inlet pressure.
Alternatively, for a withstand pressure up to and including 50 kPa, the requirement of a maximum
leakage rate of 70 dm /h for breather holes can be replaced by the following requirement:
— a ruptured electronic pressure sensing element shall lead to a safe situation (see 7.102);
— stress the electronic pressure sensing element with the temperature and pressure stress test of
6.2.3.2;
— after the tests of 6.2.3.2 the leakage rate shall fulfil the requirements of 7.2.
6.2.3.2 Test for leakage of breather holes
Shall be according to EN 13611:2015, 6.2.3.2 with the following addition:
If the alternative requirement of 6.2.3.1 is used, the following test applies:
— leave the electronic pressure sensing element as is;
— store one electronic pressure sensing element for 1 h ± 5 min at 135 °C ± 2 °C ambient temperature;
— keep the electronic pressure sensing element at this temperature and apply a pressure of three
times the withstand pressure to gas-carrying compartments for 5 min ± 10 s;
— wait for the electronic pressure sensing element to return to room temperature;
— measure the external leakage rate according to 7.2.2.
6.2.4 Screwed fastenings
Shall be according to EN 13611:2015, 6.2.4 with the following modification:
This requirement applies only to gas-carrying compartments.
6.2.5 Jointing
Shall be according to EN 13611:2015, 6.2.5 with the following modification:
This requirement applies only to gas-carrying compartments.
6.2.6 Moving parts
Shall be according to EN 13611:2015, 6.2.6.
6.2.7 Sealing caps
Shall be according to EN 13611:2015, 6.2.7.
6.2.8 Dismantling and reassembly
Shall be according to EN 13611:2015, 6.2.8.
prEN 88-3:2017 (E)
6.2.9 Auxiliary canals and orifices
Shall be according to EN 13611:2015, 6.2.9.
6.2.10 Presetting device
EN 13611:2015, 6.2.10 is not applicable.
6.2.101 Adjustments
The adjustments (e.g. outlet pressure or flow rate) shall be readily accessible to authorized persons, but
there shall be provision to discourage interference by unauthorised persons.
6.2.102 Resistance to pressure
Parts of the regulator that are subjected to inlet pressure under normal operating conditions, or could
be subjected to inlet pressure in the event of a failure, shall resist a pressure equal to the withstand
pressure.
6.2.103 Blockage of canals and orifices
Orifices of all compartments used for pressure transmission shall be protected against fouling and
clogging by suitable measures, e.g. external filters (see 10.2, h)).
The outlet pressure or flow rate signal shall stay within its pressure control or flow rate performance
(7.101.3 or 7.101.4, respectively).
6.2.104 Signal tube connections
Requirements on connections for gas pressure or furnace pressure signal tubes shall be stated in the
installation and operating instructions.
6.3 Materials
6.3.1 General material requirements
Shall be according to EN 13611:2015, 6.3.1.
6.3.2 Housing
6.3.2.1 Requirements
Shall be according to EN 13611:2015, 6.3.2.1 with the following modification:
The withstand pressure shall be used instead of maximum inlet pressure.
6.3.2.2 Test
Shall be according to EN 13611:2015, 6.3.2.2 with the following modification:
The withstand pressure shall be used instead of maximum inlet pressure. The test shall be performed in
accordance with 7.2.2.
6.3.3 Zinc alloys
Shall be according to EN 13611:2015, 6.3.3.
6.3.4 Springs
EN 13611:2015, 6.3.4 is not applicable.
prEN 88-3:2017 (E)
6.3.5 Resistance to corrosion and surface protection
Shall be according to EN 13611:2015, 6.3.5.
6.3.6 Impregnation
Shall be according to EN 13611:2015, 6.3.6.
6.3.7 Seals for glands for moving parts
Shall be according to EN 13611:2015, 6.3.7.
6.4 Gas connections
6.4.1 Making connections
Shall be according to EN 13611:2015, 6.4.1.
6.4.2 Connection sizes
Shall be according to EN 13611:2015, 6.4.2.
6.4.3 Threads
Shall be according to EN 13611:2015, 6.4.3.
6.4.4 Union joints
Shall be according to EN 13611:2015, 6.4.4.
6.4.5 Flanges
Shall be according to EN 13611:2015, 6.4.5.
6.4.6 Compression fittings
Shall be according to EN 13611:2015, 6.4.6.
6.4.7 Nipples for pressure test
Shall be according to EN 13611:2015, 6.4.7.
6.4.8 Strainers
Shall be according to EN 13611:2015, 6.4.8 with the following addition:
If strainers are used in the EPS part of regulators the outlet pressure or flow rate signal shall stay within
its pressure control or flow rate performance (7.101.3 or 7.101.4, respectively). Replacement of
strainers shall be stated in the installation and operating instructions, if applicable.
6.5 Electrical parts of the control
6.5.1 General
Shall be according to EN 13611:2015, 6.5.1.
Addition:
For technologies not specified in this standard, a safety analysis shall be performed to specify the
specific failure modes, requirements and tests for the type of technology in addition to the relevant
requirements in this standard. This safety analysis can result in additional constructional requirements
and/or additional failure modes to be included into the fault assessment. Together with the relevant
requirements of this standard, this is a set of conditions under which the new technology can be used.
prEN 88-3:2017 (E)
NOTE In general the basic risk of fire and/or explosion as a result of uncontrolled gas pressures and gas/air
ratios is considered as a class C risk.
6.5.2 Switching elements
Shall be according to EN 13611:2015, 6.5.2.
6.5.3 Electrical Components
Shall be according to EN 13611:2015, 6.5.3.
6.6 Protection against internal faults for the purpose of functional safety
6.6.1 Design and construction requirements
Shall be according to EN 13611:2015, 6.6.1.
6.6.2 Class A
Shall be according to EN 13611:2015, 6.6.2 with the following addition:
Requirements of 7.102 are applicable.
6.6.3 Class B
Shall be according to EN 13611:2015, 6.6.3.
6.6.4 Class C
Shall be according to EN 13611:2015, 6.6.4.
6.6.5 Circuit and construction evaluation
Shall be according to EN 13611:2015, 6.6.5.
7 Performance
7.1 General
Shall be according to EN 13611:2015, 7.1 with the following addition:
If there is a mounting position(s) as stated in the installation and operating instructions where the
regulator cannot operate from minimum inlet pressure or flow rate to the maximum inlet pressure or
flow rate, the range of inlet pressures or flow rates for that mounting position(s) shall be stated in the
installation and operating instructions separately.
The behaviour of the regulator from the maximum inlet pressure up to the withstand pressure shall be
stated in the installation and operating instructions.
7.2 Leak tightness
7.2.1 Requirements
Shall be according to EN 13611:2015, 7.2.1 with the following modification and addition:
Modification:
Use the withstand pressure instead of the maximum inlet pressure, if applicable.
NOTE Regulator and EPS are treated for this requirement as one device.
Internal leakage requirements are not applicable.
prEN 88-3:2017 (E)
Addition:
For signal chamber(s) without combustion gas signal carrying compartment(s), when tested according
to 7.2.2.101, the leakage rate from the signal chamber(s) shall not exceed the leakage rate at the
maximum signal pressure before and after the tests specified in 7.101.6.
Closure parts for combustion products shall remain leak-tight after being dismantled and reassembled.
7.2.2 Tests
7.2.2.1 General
Shall be according to EN 13611:2015, 7.2.2.1 with the following addition:
For regulators the lowest test pressure shall be 1,5 times the withstand pressure.
7.2.2.2 External leak-tightness
Shall be according to EN 13611:2015, 7.2.2.2 with the following addition:
If applicable the additional test conditions of 7.2.2.1 shall be taken into account.
7.2.2.3 Internal leak-tightness
EN 13611:2015, 7.2.2.3 is not applicable.
7.2.2.101 External leak-tightness for signal carrying compartment(s)
With any bleed port incorporated in the signal tube(s) or signal chamber(s) plugged, pressurize and test
the compartment(s) according to 7.2.2.1 and measure the leakage rate.
The test results shall meet the requirements of 7.2.1.
7.3 Torsion and bending
7.3.1 General
Shall be according to EN 13611:2015, 7.3.1.
7.3.2 Torsion and bending moments
7.3.2.1 Requirements
Shall be according to EN 13611:2015, 7.3.2.1 with the following addition:
For the EPS part of the regulator these requirements are not applicable.
7.3.2.2 Tests
7.3.2.2.1 General
Shall be according to EN 13611:2015, 7.3.2.2.1.
7.3.2.2.2 10 s torsion test – Group 1 and Group 2 gas controls with threaded connections
Shall be according to EN 13611:2015, 7.3.2.2.2.
7.3.2.2.3 10 s torsion test – Group 1 and Group 2 gas controls with compression joints
7.3.2.2.3.1 Olive-type compression joints
Shall be according to EN 13611:2015, 7.3.2.2.3.1.
prEN 88-3:2017 (E)
7.3.2.2.3.2 Flare and fibre seal compression joints
Shall be according to EN 13611:2015, 7.3.2.2.3.2.
7.3.2.2.3.3 Flanged or saddle-clamp inlet connections for attachment to cooking appliance gas
manifolds
EN 13611:2015, 7.3.2.2.3.3 is not applicable.
7.3.2.2.4 10 s bending moment test – Group 2 gas controls
Shall be according to EN 13611:2015, 7.3.2.2.4 with the following modification:
For the EPS part of the regulator this test is not applicable.
7.3.2.2.5 900 s bending moment test – Group 1 gas controls only
Shall be according to EN 13611:2015, 7.3.2.2.5 with the following modification:
For the EPS part of the regulator
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