Thermocouple
A
thermocouple is an electrical device consisting of two dissimilar
electrical conductors forming electrical junctions at differing
temperatures. A thermocouple produces a temperature-dependent voltage as
a result of the thermoelectric effect, and this voltage can be
interpreted to measure temperature. Thermocouples are a widely used type
of temperature sensor.
Commercial thermocouples are inexpensive, interchangeable, are
supplied with standard connectors, and can measure a wide range of
temperatures. In contrast to most other methods of temperature
measurement, thermocouples are self-powered and require no external form
of excitation. The main limitation with thermocouples is accuracy;
system errors of less than one degree Celsius (°C) can be difficult to
achieve.
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.
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| Thermocouple type K |
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| Thermocouple type R |
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| Thermocouple type J |
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| RTD PT 50, 100, 1000 |
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