NBN EN 125 : 2010

1 General
    1.1 Object and field of application
    1.2 References
    1.3 Definitions
    1.4 Classification
    1.5 Measuring units
2 Construction requirements
    2.1 General construction requirements
    2.2 Materials
    2.3 Connections
    2.4 Seals for glands for moving parts
    2.5 Pressure test nipples
    2.6 text deleted
    2.7 Ignition
3 Performance requirements
    3.1 General
    3.2 Leak-tightness
    3.3 Rated flow rate
    3.4 Operating torque and force
    3.5 Interlocks
    3.6 text deleted
    3.7 Closing current
    3.8 Torsion and bending
    3.9 Durability
    3.10 Sealing force
4 Test methods
    4.1 General
    4.2 Leak-tightness
    4.3 Rated flow-rate
    4.4 Operating torque and force
    4.5 Interlocks
    4.6 text deleted
    4.7 Measurement of the closing current
    4.8 Torsion and bending
    4.9 Durability
    4.10 Measurement of the sealing force
    4.11 Electrical equipment test
5 Marking, installation and operating instructions
    5.1 Marking
    5.2 Installation, operating and servicing
          instructions
    5.3 Warning notice
Annexes
A Leak-tightness test - volumetric method
B Leak-tightness test - pressure loss method
C Use of ISO 7-1: 1982 and ISO 228-1: 1982 threads for
    connections
D Conversion of pressure loss into leakage rate
E Identification of clauses awhich meet the Essential
    Requirements of the Gas Appliance Directive
    (90/936/EEC)
Tables
1 Connection sizes
2 Maximum leakage rates
3 Nominal sizes DN and operating torque
4 Torque and bending moment
5 Sequence of testing
6 Tightening torque for flange bolts
Figures
1 Equipment for the flow rate test
2 Electrical circuit for measuring the closing current
3 Arrangement for torsion test
4 Arrangement for bending moment test
5 Paint scratch test apparatus
6 Various types of thermo-electric flame supervision
    devices in the de-energized position
7 Various types of thermo-electric flame supervision
    devices in the operating and ignition position
8 Apparatus for testing leak-tightness (volumetric
    method)
9 Apparatus for testing leak-tightness (pressure loss
    method)

Gives the safety, constructional and performance requirements for thermo-electric flame supervision devices, energized by a thermocouple for use with gas appliances. Gives the test procedures for evaluating these. Applies to devices of connection size up to and including DN 50 for use with 1st, 2nd or 3rd family gases. Does not cover the thermocouple.