What is the difference between thermopile and thermocouple

In contrast to most other methods of temperature measurement, thermocouples are self powered and require no external form of excitation. Thermocouples are widely used in science and industry. Applications include temperature measurement for kilns, gas turbine exhaust, diesel engines, and other industrial processes. Thermocouples are also used in homes, offices and businesses as the temperature sensors in thermostats, and also as flame sensors in safety devices for gas-powered appliances.

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.

Thermocouples can be connected in series as thermocouple pairs with a junction located on either side of a thermal resistance layer. The output from the thermocouple pair will be a voltage that is directly proportional to the temperature difference across the thermal resistance layer and also to the heat flux through the thermal resistance layer.

Adding more thermocouple pairs in series increases the magnitude of the voltage output. Thermopiles can be constructed with a single thermocouple pair, composed of two thermocouple junctions, or multiple thermocouple pairs. Thermopiles do not respond to absolute temperature, but generate an output voltage proportional to a local temperature difference or temperature gradient.

This guide offers a quick and easy comparison of a thermopile vs thermocouple. A thermocouple is composed with the help of two wires of various materials by which the voltage is produced. In many appliances that use a gas flame, the thermocouple generates voltages that help detect temperature.

The voltage and the variation of temperatures at both junctions are proportional to each other. The thermocouple works the same as the electric conductors in which heat lies at the first junction and passes to the second junction. This is how you can observe the voltage in this device that results in electricity. A thermopile is a device that is the combination of thermocouples arranged in a series or parallel connections. As compared to the thermocouples, it results in more voltages to detect the temperature of the appliance.

The most important property of this device is the high production of output. This is due to the connections of more thermocouples in a thermopile. But, it's essential to make sure that the connections are not weak and enough to produce excessive outputs.

Here we have gathered the fundamental difference between a thermopile and a thermocouple that will be helpful to know and learn for a technician. If the thermopile needs to be replaced in any home or commercial appliance, do you think you can use the Thermocouple instead of the thermopile?

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