Thermocouple

Model No: RA18B
Material: Copper
Type: Gas Heater Parts

Specification:
Thermal potential ( actuated at 650 ): above 15mV
Length specification: Optional between 206mm~1815mm
Internal resistance( 25°C)Length variation: 16±3mΩ  ~ 54±3mΩ 
Connection mode: Spiral, insertion at both terminals, compound connection (insertion and screw set) 

Working principle:
Thermocouple is used with magnet vlave together and become a flameout safety protector

Thermocouple is a part that converses thermo energy into electrical energy.It mainly provids continuous electrical energy for magnet. It will stop providing electrical energy for magnet when the flame is put out by external factors, then the magnet acts so that the gas valve is closed ,which prevent the danger from gas leakage.