What is a Thermocouple?
A thermocouple can be regarded as a component used for measuring temperature. How can this be different from an ordinary temperature sensor? Well…. unlike other temperature sensors, thermocouples can be used in situations where very high temperature measurements need to be taken and therefore their temperature range is relatively high when compared with other temperature sensors.
Generally, a thermocouple consists of two wires with different metals and they are opened at one end and joined together at the other end. The open end where it connects to the Thermocouple Amplifier is called the “cold junction” and the joint end is called the “hot junction”.
What is a Thermocouple Amplifier?
Now that we know what a thermocouple is, how can we really output a temperature reading from a thermocouple? This can be achieved by using an amplifier circuit which is also known as a Thermocouple Amplifier. The temperature output from a thermocouple amplifier depends on the voltage produced at the reference junction. And the voltage produced at the reference junction depends on the temperature difference between the reference junction and the measurement junction. So, in order to get an accurate temperature reading, the reference junction temperature must be known. This can be achieved by using a Thermocouple Amplifier where its circuit has a temperature sensor to measure the reference junction temperature. This is known as cold junction compensation.
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