Standard
Track updates
AS 4625-2008
[Current]Electronic flame safeguards and flame detectors
Synopsis Publication Specifies the uniform minimum requirements for manufacturers, designers, regulatory authorities, testing laboratories and similar organizations for the safety, performance and use of combination controls for electronic flame safeguards and flame detectors. These electronic flame safeguards and flame detectors are intended for use on gas and multi-fuel burners.
Published: 31/12/2008
Pages: 30
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Referenced documents
1.3 Definitions
1.4 General requirements
1.5 Classification
1.5.1 Class
1.5.2 Type
1.5.3 Flame safeguards for particular applications
1.5.3.1 Class 3 flame safeguard
1.5.3.2 Class 2 flame safeguard
1.5.3.3 Class 1 flame safeguard
2 Construction and design
2.1 Materials
2.1.1 Continuity of satisfactory operation
2.1.2 Suitability of materials for conditions of use
2.2 Construction
2.2.1 Continuity of satisfactory operation
2.2.2 Accidental displacement of parts
2.2.3 Sharp edges
2.2.4 Prevention of accidental shift after calibration
2.2.5 Mounting
2.2.6 Enclosure of the mechanism
2.2.7 Location or enclosure of electrical parts
2.2.8 Limiting of adjustments
2.2.9 Adjustable stop
2.3 Design
2.3.1 Terminals
2.3.2 Flame safeguards with a fault
2.3.3 Flame safeguards with undetected fault
2.3.4 Circuitry of a Class 3D safeguard
2.3.5 Reset button or external operating switches
2.3.6 Automatic tripping
2.3.7 Self-check function
2.3.8 Electricity supply failure
2.3.9 Flame relay amplifier
2.3.10 Special tools not required for replacement
2.3.11 Adjusting devices
2.3.12 Components requiring servicing
2.3.13 Substitution of flame safeguards or components
2.4 Markings
2.4.1 General
2.4.2 Marking of electrical connections
2.4.3 Marking of viewing cell flame detectors
2.4.4 Durability of markings
2.5 Instructions
2.5.1 General
3 Performance requirements
3.1 General
3.2 Electrical
3.2.1 Device functions fully and correctly above and below rated voltage range
3.2.2 Device functions fully and correctly at high and low mains supply voltage range
3.2.3 Shutdown with electrical supply interruption
3.2.4 Lockout
3.2.5 Power to terminals
3.3 Flame detectors
3.3.1 Viewing cell type
3.3.2 Flame detector with infra-red sensor
3.3.3 Open-circuit or short-circuit
3.4 Flame failure response
3.4.1 Type A and B
3.4.2 Type Ca
3.4.3 Type Cb
3.4.4 Class 3D
3.5 Compliance with requirements
3.5.1 Other than Type C
3.5.2 Type C
3.6 Safe start check
3.6.1 Fault checking
3.6.2 Timing
3.7 Continual self-check
3.7.1 Class 1
3.7.2 Flame failure response time
3.7.3 Fault condition
3.7.4 Loss of flame simulation
3.8 Programming function
3.8.1 General
3.8.2 Air interlock
3.8.3 Purge period
3.8.4 Ignition
3.8.4.1 Ignition terminals not energized before pre-purge
3.8.4.2 Ignition terminals of a flame safeguard
3.8.4.3 Types A and Ca
3.8.4.4 Programming flame safeguard
3.8.5 Intermittent start flame
3.8.5.1 Type A or Ca
3.8.5.2 Type B or Cb
3.8.6 Interrupted start flame
3.8.7 Direct spark ignition
3.9 Durability
3.9.1 Cycle test
3.9.2 Programming flame safeguard durability
Appendix A
A1 Scope
A2 Principle
A3 Apparatus
A4 Materials
A5 Procedure
Appendix B
B1 Scope
B2 Principle
B3 Apparatus
B4 Materials
B5 Preparation of apparatus
B6 Procedure
Appendix C
C1 Scope
C2 Principle
C3 Apparatus
C4 Materials
C5 Preparation of apparatus
C6 Procedure
Appendix D
D1 Scope
D2 Principle
D3 Apparatus
D4 Preparation of apparatus
D5 Procedure
Appendix E
E1 Scope
E2 Principle
E3 Apparatus
E4 Preparation of apparatus
E5 Procedure
Appendix F
F1 Scope
F2 Principle
F3 Apparatus
F4 Materials
F5 Preparation of apparatus
F6 Procedure
Appendix G
G1 Scope
G2 Principle
G3 Apparatus
G4 Materials
G5 Preparation of apparatus
G6 Procedure
Appendix H
H1 Calculation of L and R
H2 Calculated values
Appendix I
Cited references in this standard
EN 298
Automatic gas burner control systems for gas burners and gas burning appliances with or without fans
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