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Thermopile Optical Power Sensors. Thermopile sensors are based on thermocouples. A thermocouple consists of two dissimilar metals connected in series. To detect radiation, one metal junction is typically blackened to absorb the radiation. The temperature rise of this junction with respect to another non-irradiated junction generates a voltage.
Jun 23, 2020· The thermocouple can do this because, in its probe, it contains two different metals, and a voltage is generated when one of them is heated. This is the result of a phenomenon known as the Seebeck Effect. Nothing lasts forever, and when the thermocouple wears out, the pilot won't stay lit and your appliance won't work.
A pilot light can go out. When this happens, there is no electricity, so it shuts down the gas control valve until the light is relit. The mechanism required to relight your pilot light depends on how new or old your unit is. The thermopile is the compilation of several thermocouples together.
Sep 09, 2020· Diagnosing a Thermopile Problem Just like the thermocouple, the thermopile can be read with a multimeter to check if it’s the cause of the problem. Three hundred millivolts or higher voltage is a sign of a good thermopile. A reading below 300 millivolts would require you to replace the thermopile.
Jun 20, 2018· A thermopile is an electronic device that converts thermal energy into electrical energy. It is composed of several thermocouples connected usually in series or, less commonly, in parallel . Thermocouples operate by measuring the temperature differential from their junction point to the point in which the thermocouple output voltage is measured ...
MultiMeter Thermocouple Test Procedure. First, remove the thermocouple. Secondly, turn on the meter and set it to Ohms. Touch the two leads together from the meter, and you should get a reading close to zero. With the leads apart, you will read infinity. That is simply a test to check the meter for continuity.
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Pilot light heats the thermocouple or thermopile, producing small millivoltage of electricity that travels to the gas control valve. Current from thermocouple travel to control on a hollow copper pilot tube with wire inside. Current from thermopile travel through 2 wires that …
Dec 03, 2019· A thermocouple can be found in diesel engines, gas turbines, kilns, gas water heater, temperature sensor in thermostats, etc. Corrosion and buildup are some of the things that can affect a thermocouple. They can prevent power from reaching the pilot light, thus the water won’t heat up.
1. Connection from the thermocouple to the valve. Clean the threads of the connecting nut with a pencil eraser and re-tighten. 2. Pilot hood and flame direction. The pilot should heat the top 7/8” of the thermocouple with a clean (blue) flame. If the flame hits the thermocouple too low, it can cause the unit
Dec 13, 2008· Hi Everyone, Can someone tell me the difference between the Thermocouple and the Thermopile and what their functions are exactly. I know the Thermocoupler produces mili volts from the heat that is put on it from the pilot light and this is sent to the gas valve to prevent a explosion if the pilot light is not lit and the gas valve is opened, but I am not sure what the Thermopile does exactly.