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The Thermal Resistance Temperature Sensor
Sep 14, 2018

The thermal resistance temperature sensor is composed of reference unit, R/V conversion unit, linear circuit, reverse connection protection, current limiting protection, V/I conversion unit and so on. After the temperature and thermal resistance signal is converted and amplified, the non-linear relationship between temperature and resistance is compensated by the linear circuit. After the V/I conversion circuit, a constant current signal of 4-20ma, which is linear to the measured temperature, is output.

Thermocouple temperature sensor generally consists of reference source, cold end compensation, amplification unit, linearization process, V/I conversion, break couple processing, reverse connection protection, current limit protection and other circuit units. The thermoelectric potential generated by the thermocouple is amplified by the cold end compensation, and then the nonlinear error of thermoelectric potential and temperature is eliminated by the linear circuit, and finally the amplification is converted into the 4-20ma current output signal. In order to prevent the accident caused by temperature control failure due to the broken wires of the thermocouple in the measurement of the thermocouple, a power cut protection circuit is also provided in the sensor. When the thermocouple is broken or not properly connected, the sensor will output maximum (28mA) to power the meter. The integrated temperature sensor has the advantages of simple structure, saving lead, large output signal, strong anti-interference ability, good linearity, simple display instrument, solid module anti-dampness and anti-dampness, reverse connection protection and current-limiting protection, and reliable operation. The output of integrated temperature sensor is 4 ~ 20mA signal. It can be used with microcomputer system or other conventional instruments. Users can also request to make explosion-proof or fireproof measuring instruments.