Robertshaw 1970-018 18" Thermocouple 20-30mV

The Robertshaw 1970-018 Thermocouple is a temperature-sensing component that generates a small electrical signal from heat at the sensing junction. Its thermoelectric construction produces a voltage as the heated junction develops a temperature difference relative to the cooler reference point, providing the signal required for control operation. The 18-inch thermocouple is positioned between the pilot flame and gas control assembly in HVAC systems, with a 20-30 mV output range for the specified application. This generated signal maintains the gas control circuit when the pilot flame is properly established.