The difference between thermal resistance and thermocouple in Huabei Huadian Primary School

Categories:News
Author:
Origin:
Time of issue:2019-10-25 17:01
Views:

(Summary description)1. Signal type: The thermal resistance itself is a resistance signal. With the change of temperature, the resistance has a positive or negative resistance value change. The resistance signal is measured by the power supply excitation, so there is a hysteresis in the temperature transmission. Different conductors or semiconductors are connected into a closed loop. When the temperature at the two terminals is different, a thermoelectric potential will be generated in the loop, which will cause a change in the induced voltage, which will change with the change in temperature, and a directly measured voltage signal.

The difference between thermal resistance and thermocouple in Huabei Huadian Primary School





The difference between thermal resistance and thermocouple in Huabei Huadian Primary School

(Summary description)1. Signal type: The thermal resistance itself is a resistance signal. With the change of temperature, the resistance has a positive or negative resistance value change. The resistance signal is measured by the power supply excitation, so there is a hysteresis in the temperature transmission. Different conductors or semiconductors are connected into a closed loop. When the temperature at the two terminals is different, a thermoelectric potential will be generated in the loop, which will cause a change in the induced voltage, which will change with the change in temperature, and a directly measured voltage signal.

Categories:News
Author:
Origin:
Time of issue:2019-10-25 17:01
Views:

1. Signal type: The thermal resistance itself is a resistance signal. With the change of temperature, the resistance has a positive or negative resistance value change. The resistance signal is measured by the power supply excitation, so there is a hysteresis in the temperature transmission. Different conductors or semiconductors are connected into a closed loop. When the temperature at the two terminals is different, a thermoelectric potential will be generated in the loop, which will cause a change in the induced voltage, which will change with the change in temperature, and a directly measured voltage signal.

2. Detection temperature range: Generally, the thermal resistance is -200 ℃ -800 ℃; the thermocouple can detect -50 ℃ -1600 ℃; therefore, the former is generally used for low-temperature detection, and the latter is generally used for high-temperature detection.

3. Usage method: PLC has thermal resistance module and thermocouple module, which can directly input resistance and galvanic signals. Generally, PLC is directly connected to 4-20ma signal, so the thermal resistance and thermocouple signals need to pass the integrated temperature transmitter or The isolated temperature transmitter is converted into 4-20ma and connected to the PLC.

4. The thermal resistance signal does not need to be cold-junction compensated. Use shielded cables for transmission. The thermocouple needs to be cold-junction-compensated and use temperature-compensated wires for transmission.

Keyword:

Scan the QR code to read on your phone

Previous: Huaibei Huadian-Talking about the difference between passive isolator and active isolator

Next: Here comes the dry goods! Analysis of common alarm faults of electromagnetic flowmeter

Previous: Huaibei Huadian-Talking about the difference between passive isolator and active isolator

Next: Here comes the dry goods! Analysis of common alarm faults of electromagnetic flowmeter