Resideo Q309A1970 Thermocouple Pilot Flame Detector

The Resideo Q309A1970 Thermocouple Pilot Flame Detector is a temperature-to-electrical conversion in gas-fired HVAC systems that is used to check the presence of pilot flame. Its main use is to produce a low electrical signal that is proportional to the heat of a pilot flame. It works on the concept of generating voltage when the junction becomes hot so that the control system can determine the presence of a flame. It is by placing the sensing tip in the pilot flame line and making a suitable electrical connection.