When it stops working the furnace s pilot light also turns off.
Furnace thermocouple test.
A thermocouple is a safety device that helps control the gas supply in gas heated furnaces.
A furnace thermocouple is a device on a standing pilot gas furnace that s responsible for opening and closing the main gas line to your home s heating system.
Every gas appliance with a standing pilot that cycles on and off needs a thermocouple.
Anything under or hovering around the 20 millivolts mark means the thermocouple needs to be replaced.
The queen s awards for enterprise.
This device generates a small electric signal to keep the gas valve open when the pilot is on.
The concentric design of the isotech 877 thermocouple calibration furnace avoids the large temperature gradients present in simple tube furnaces.
A slim rod shaped flame sensor sits in the path of your pilot flame where it collects and then transfers heat down via a flexible connector wire or tube to signal through an electrical charge that the main gas valve should open.
If you re still unsure or don t have a working pilot light test the thermocouple with a multimeter.
How to inspect your furnace s thermocouple.
This monitoring is necessary because the heat of the pilot flame sends the necessary voltage to open the valve to turn the furnace on.
Importantly always make sure the tip of the thermocouple is directly in the pilot flame.
The reading should be between 25 and 30.
Thermocouples designed for residential gas appliances such as fireplaces water heaters and furnaces are made for 30 millivolts.
What does a thermocouple look like and how do you find it.
If you test the thermocouple with the multimeter and you get a reading above 25 then you have another issue.
Your furnace s thermocouple is usually located right in the flame of the furnace s pilot light.
Saturn model 877 thermocouple calibration furnace to 1300 c product details.
High temperature k type thermocouple sensor ceramic kiln furnace with connector plate and hook up cable 2372f 1300c cr 06 4 3 out of 5 stars 45 32 99 32.
Discretion should be used if the reading is between 21 and 25.
You will need a wrench multi meter and a flame source like a candle or a lighter to perform the test.
You can test it with a multimeter.
If the pilot lights but won t stay lit the thermocouple is probably bad.
