How are the positive and negative poles of a thermocouple connected

1. The basic principle of thermocouples
A thermocouple is a sensor that uses the thermoelectric effect to measure temperature. It is composed of two different metal wires connected, one end is called the hot end and the other end is called the cold end. When the temperature of the hot and cold ends is different, a potential difference will be generated. The potential difference of this difference is called thermoelectric potential, which is used to measure temperature.
2. Principles of positive and negative pole connection
It is important to follow the following principles in order to correctly connect the positive and negative poles of the thermocouple:
The connection of positive and negative electrodes should be consistent throughout the entire measurement system. This means that the positive and negative electrode connections must be consistent on both the joint connected to the thermocouple and the measuring instrument.
Avoiding thermoelectric potential errors: Due to factors such as contact resistance and wire length, thermoelectric potential errors may occur. To minimize this error, cables of the same type and length should be used to connect the positive and negative poles to maintain consistency in potential.
The working temperature range of thermocouples is very wide, so the connection between positive and negative electrodes should be able to withstand high temperature environments and maintain a stable connection.
3. Common positive and negative pole connection methods
According to different application requirements, the positive and negative poles of thermocouples can be connected in multiple ways:
Connect two thermocouple wires in a parallel manner, with the positive and negative poles connected separately.
Connect the two thermocouple wires in sequence, with the positive and negative poles connected.
By connecting a wire of one thermocouple to a wire of the same polarity of another thermocouple, the measurement of potential difference can be increased.
Correctly connecting the positive and negative poles of a thermocouple is crucial to ensuring measurement accuracy. During the connection process, it is necessary to maintain consistency, avoid thermoelectric errors, and consider high temperature resistance. According to different application requirements, parallel connection, series connection, or differential connection can be used. Only by selecting and using the correct connection method can thermocouples function properly and provide accurate and reliable temperature measurement results.