AS 4625-2005

1 - AS 4625-2005 ELECTRONIC FLAME SAFEGUARDS AND FLAME DETECTORS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE, CLASSIFICATION AND DEFINITIONS
6 - 1.1 SCOPE
6 - 1.2 CLASSIFICATION
6 - 1.2.1 Class
7 - 1.2.2 Type
8 - 1.2.3 Class 3 flame safeguard
8 - 1.2.4 Class 2 flame safeguard
8 - 1.2.5 Class 1 flame safeguard
8 - 1.3 DEFINITIONS
8 - 1.3.1 Atmospheric burner
8 - 1.3.2 Authority
8 - 1.3.3 Automatic ignition
8 - 1.3.4 Automatic operation
8 - 1.3.5 Automatic shut off valve
8 - 1.3.6 Certified
9 - 1.3.7 Certifying body
9 - 1.3.8 Direct ignition device
9 - 1.3.9 Electronic flame safeguard
9 - 1.3.10 Flame establishment period
9 - 1.3.11 Flame failure response time
9 - 1.3.12 Flame proving period
9 - 1.3.13 Flame safeguard
9 - 1.3.14 Flame safeguard system
9 - 1.3.15 Interlock
9 - 1.3.16 Intermittent pilot
9 - 1.3.17 Interrupted pilot
9 - 1.3.18 Lockout
9 - 1.3.19 Natural draught
9 - 1.3.20 Natural draught burner
9 - 1.3.21 Natural draught flue
10 - 1.3.22 Pilot
10 - 1.3.23 Programming flame safeguard
10 - 1.3.24 Purge
10 - 1.3.25 Pre-purge
10 - 1.3.26 Safety shutdown
10 - 1.3.27 Technical regulator
10 - 1.3.28 Valve
10 - 1.3.29 Waiting time
11 - SECTION 2 CONSTRUCTION AND DESIGN
11 - 2.1 MATERIALS
11 - 2.1.1 Continuity of satisfactory operation
11 - 2.1.2 Suitability of materials for conditions of use
11 - 2.2 CONSTRUCTION
11 - 2.2.1 Continuity of satisfactory operation
11 - 2.2.2 Accidental displacement of parts
11 - 2.2.3 Sharp edges
11 - 2.2.4 Prevention of accidental shift after calibration
11 - 2.2.5 Mounting
11 - 2.2.6 Enclosure of the mechanism
11 - 2.2.7 Location or enclosure of electrical parts
11 - 2.2.8 Limiting of adjustments
12 - 2.2.9 Adjustable stop
12 - 2.3 DESIGN
12 - 2.3.1 Terminals
12 - 2.3.2 Flame safeguards with a fault
12 - 2.3.3 Flame safeguards with undetected fault
12 - 2.3.4 Circuitry of a Class 3D safeguard
12 - 2.3.5 Reset button or external operating switches
12 - 2.3.6 Automatic tripping
12 - 2.3.7 Self-check function
12 - 2.3.8 Electricity supply failure
12 - 2.3.9 Flame relay amplifier
13 - 2.3.10 Special tools not required for replacement
13 - 2.3.11 Adjusting devices
13 - 2.3.12 Components requiring servicing
13 - 2.3.13 Substitution of flame safeguards or components
13 - 2.4 MARKINGS
13 - 2.4.1 General
13 - 2.4.2 Marking of electrical connections
13 - 2.4.3 Marking of viewing cell flame detectors
13 - 2.4.4 Durability of markings
13 - 2.5 INSTRUCTIONS
13 - 2.5.1 General
15 - SECTION 3 PERFORMANCE REQUIREMENTS
15 - 3.1 GENERAL
15 - 3.1.1 Satisfactory performance over declared temperature range
15 - 3.2 ELECTRICAL
15 - 3.2.1 Device functions fully and correctly above and below rated voltage range
15 - 3.2.2 Device functions fully and correctly at high and low mains supply voltage range
15 - 3.2.3 Shutdown with electrical supply interruption
15 - 3.2.4 Lockout not to be reset
15 - 3.2.5 Power to terminals
15 - 3.3 FLAME DETECTORS
15 - 3.3.1 Viewing cell type
15 - 3.3.2 Flame detector with infra-red sensor
15 - 3.3.3 Open circuit or short circuit
16 - 3.4 FLAME FAILURE RESPONSE
16 - 3.4.1 Type A and B
16 - 3.4.2 Type Ca
16 - 3.4.3 Type Cb
16 - 3.4.4 Class 3D
16 - 3.5 SAFE START CHECK
16 - 3.5.1 Fault checking
16 - 3.5.2 Timing
16 - 3.6 CONTINUAL SELF-CHECK
16 - 3.6.1 Class 1
16 - 3.6.2 Flame failure response time
16 - 3.6.3 Fault condition
17 - 3.6.4 Loss of flame simulation
17 - 3.7 PROGRAMMING FUNCTION
17 - 3.7.1 General
17 - 3.7.2 Air interlock
17 - 3.7.3 Purge period
17 - 3.7.4 Ignition
18 - 3.7.5 Intermittent start flame
18 - 3.7.6 Interrupted start flame
18 - 3.7.7 Direct spark ignition
18 - 3.8 DURABILITY
18 - 3.8.1 Cycle test
18 - 3.8.2 Programming flame safeguard durability
19 - APPENDIX A - METHODS OF TEST
19 - A1 SAMPLES
20 - A2 M.O.T. 2.4.4 Œ 95 MARKINGS AND LABELS
20 - A2.1 SCOPE
20 - A2.2 METHOD
20 - A2.3 APPARATUS
20 - A2.4 MATERIALS
20 - A2.5 PROCEDURE
20 - A2.6 RESULT
21 - A3 M.O.T. 3.1.1, 3.2.1/2, 3.2.4, 3.4.1/4 Œ 91 FLAME FAILURE RESPONSE (OTHER THAN TYPE C)
21 - A3.1 SCOPE
21 - A3.2 METHOD
21 - A3.3 APPARATUS
21 - A3.4 MATERIALS
21 - A3.5 PREPARATION OF APPARATUS
21 - A3.6 PROCEDURE
23 - A3.7 RESULT
24 - A4 M.O.T. 3.1.1, 3.2.1/2 AND 3.4.2/3 Œ 91 FLAME FAILURE RESPONSE (TYPE C)
24 - A4.1 SCOPE
24 - A4.2 METHOD
24 - A4.3 APPARATUS
24 - A4.4 MATERIALS
24 - A4.5 PREPARATION OF APPARATUS
25 - A4.6 PROCEDURE
25 - A4.7 RESULT
27 - A5 M.O.T. 3.3.1 Œ 86 VIEWING CELL RESPONSE
27 - A5.1 SCOPE
27 - A5.2 METHOD
27 - A5.3 APPARATUS
27 - A5.4 PREPARATION OF APPARATUS
27 - A5.5 PROCEDURE
27 - A5.6 RESULT
28 - A6 M.O.T. 3.3.2 Œ 82 OPEN CIRCUIT AND SHORT CIRCUIT OF FLAME DETECTOR
28 - A6.1 SCOPE
28 - A6.2 METHOD
28 - A6.3 APPARATUS
28 - A6.4 PREPARATION OF APPARATUS
28 - A6.5 PROCEDURE
28 - A6.6 RESULT
29 - A7 M.O.T. 3.7.2 Œ 83 AIR INTERLOCK
29 - A7.1 SCOPE
29 - A7.2 METHOD
29 - A7.3 APPARATUS
29 - A7.4 MATERIALS
29 - A7.5 PREPARATION OF APPARATUS
29 - A7.6 PROCEDURE
29 - A7.7 RESULT
30 - A8 M.O.T. 3.8.1 Œ 01 DURABILITY
30 - A8.1 SCOPE
30 - A8.2 METHOD
30 - A8.3 APPARATUS
30 - A8.4 MATERIALS
30 - A8.5 PREPARATION OF APPARATUS
30 - A8.6 PROCEDURE
31 - A8.7 RESULT
32 - APPENDIX B - SUPPLEMENT TO M.O.T. 3.8.1 DURABILITY
32 - B1 CALCULATION OF L AND R
33 - B2 CALCULATED VALUES
34 - APPENDIX C - AS 4625 CLASS AND EN 298 CLASSIFICATION EQUIVALENCE GUIDE
35 - APPENDIX D - LIST OF REFERENCED DOCUMENTS

Specifies the uniform minimum requirements for manufacturers, designers, regulatory authorities, testing laboratories and similar organizations for the safety, performance and use of electronic flame safeguards and flame detectors. These electronic flame safeguards and flame detectors are intended for use with natural gas, town gas, tempered liquefied petroleum gas and liquefied petroleum gas.

These requirements apply to electronic flame safeguards and flame detectors for use on gas or multi-fuel burners.They do not cover complete burner management systems except insofar as the flame safeguard has provision to be interlocked into the burner management system.Compliance with these requirements does not imply acceptability for use without supplemental tests in an intended application.A flame safeguard and flame detector shall comply with the requirements of the appropriate electrical authority.Where a programmable electronic system (PES) is employed for safety related functions of burner management systems, the PES shall:be certified to the requirements of this Standard and conform to the relevant requirements of EN298 (or equivalent); or be certified by a body recognized by the Certifying Body to the requirements of EN298 (or equivalent).Requirements for thermoelectric flame safeguards and electronic igniters are published in AS4620 and AS4622.Flame safeguards incorporating electronic igniters shall meet the requirements of both this Standard and all the appropriate requirements of AS4622.European Standard, EN298, has been identified as an appropriate Standard for the evaluation of electronic flame safeguards and flame detectors. Compliance with EN298 will also be deemed to comply with the requirements of this Standard, however, specific local requirements as specified in this Standard shall take precedence.Compliance will be subject to the provision of relevant documentation submitted to the Certifying Body.Refer to Appendix C, which details equivalent European classification codes.

Originated as AG 210-1976.
Previous edition 1998.
Republished and designated AS 4625-2005.