The Q340A thermocouples sense the pilot flame on standing pilot gas-fired heating systems. The pilot flame heats the tip of the thermocouple, producing a temperature differential between it and the base to generate 30 millivolts.

Honeywell Thermocouple, Male Connector Nut Connection, 30 mV, 0.02 ohm, Natural/LP Gas, 36 in L Lead, Import

• Push-in clip, split nut or adapter assembly available (Depending on model) For easy pilot burner installation
• Male nut connector for Pilotstat safety control power units
• 26-32 mV open circuit output
• 760 deg C hot junction, 416 deg C cold junction temperature
• Adapter, push-in clip

• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/Honeywell_Q390A1046_U_Manual.pdf