Characteristics and structural requirements of thermocouples

Thermocouples are commonly used temperature measuring components in temperature measuring instruments. They directly measure temperature and convert the temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium through electrical instruments (secondary instruments). It usually consists of main parts such as hot electrodes, insulation sleeves, protective tubes, and junction boxes, and is usually used in conjunction with display instruments, recording instruments, and electronic regulators.

Characteristics of Thermocouples:

1. Simple assembly and easy replacement;

2. Spring type temperature sensing element with good seismic performance;

3. High measurement accuracy;

4. Large measurement range (-200 ℃~1300 ℃, in special cases -270 ℃~2800 ℃);

5. Fast thermal response time;

6. High mechanical strength and good pressure resistance;

7. High temperature resistance up to 2800 degrees;

8. Long service life.

Structural requirements for thermocouples:

In order to ensure the reliable and stable operation of thermocouples, the structural requirements for them are as follows:

1. The welding of the two thermoelectric electrodes that make up the thermocouple must be firm;

2. The two thermoelectric electrodes should be well insulated from each other to prevent short circuits;

3. The connection between the compensating wire and the free end of the thermocouple should be convenient and reliable;

4. The protective sleeve should ensure sufficient isolation between the thermoelectric electrode and harmful media.