How to correctly wire K-type probe thermocouples

What is a K-type probe thermocouple?
Thermocouple is a commonly used temperature measurement device that measures the temperature of an object based on the principle of thermoelectric effect. K-type probe thermocouple is one of the common types.

2. Working principle of K-type probe thermocouple
K-type thermocouples are composed of two different materials of metal wires, one wire is nickel chromium alloy (referred to as the positive electrode), and the other wire is nickel aluminum alloy (referred to as the negative electrode). When these two types of wires are connected together, a closed circuit is formed.

When the two connection points of the thermocouple are at different temperatures, an electromotive force will be generated at the connection of the wire. The magnitude of this electromotive force is proportional to the temperature difference between the two connection points. By measuring this electromotive force, we can accurately measure the temperature of an object.

3. Wiring method for K-type probe thermocouple
Correct wiring is crucial for measuring thermocouples. The following are the steps for the correct wiring of K-type probe thermocouples:

4. Preparation work
Before wiring, make sure that the two wires of the thermocouple are not damaged or corroded, and are clean.

5. Wiring sequence
The correct wiring sequence is to contact the positive terminals of the two wires with the positive terminals of the instrument, and the negative terminals with the negative terminals of the instrument.

6. Fixed wiring
After wiring is completed, it is necessary to firmly fix the contact end of the wire to prevent measurement errors caused by poor contact.

7. Correction
After the wiring is completed, zero point correction and temperature correction are also required to ensure the accuracy of the measurement results.

8. Precautions
During the wiring process, additional temperature changes should be avoided. Otherwise, these changes will interfere with the temperature measurement results.

If measuring high-temperature objects, it is necessary to choose high-temperature resistant wires and wiring terminals to prevent melting or damage.

During use, the wires and terminals of the thermocouple should be regularly checked to ensure good contact performance.

K-type probe thermocouple is a commonly used temperature measurement device that determines the temperature of an object by measuring the electromotive force between wires. In the wiring process, the correct wiring sequence and fixed wiring are important, and calibration work is also needed to ensure the accuracy of the measurement results.