The Honeywell is a genuine thermocouple spare part for use with the catalogue and diploma boiler ranges. The thermocouple is designed to sense the pilot flame on gas-fired central heating systems as the tip is heated by the flame, producing a temperature differential between itself and the base to generate 30mV.
Maximum operating temperature on a hot junction is 750C and on a cold junction it is 415C
Recommended operating temperature is 650 +C or - 50C
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Technical specification
Waist Sizeaa88cb38gtTypeThermocoupleSupplier Part NumberQ309A 2788Brand NameResideo