Industrial Integrated Temperature Sensor Technical Reference

The integrated temperature sensor for industrial use is composed of electronic units such as thermocouples, thermal resistors, and bimetallic thermometers. The temperature transmitter module is connected to the temperature sensor probes such as thermocouples and thermal resistors and the temperature transmitter module is installed in the junction box to form an integrated temperature sensor. The integrated temperature sensor is generally divided into three types: thermal resistors, thermocouples, and bimetallic thermometers.
The integrated temperature sensor is composed of a reference unit, an R/V conversion unit, a linear circuit, reverse connection protection, current limiting protection, and a V/I conversion unit. After the temperature measuring thermal resistor signal is converted and amplified, the linear circuit compensates for the nonlinear relationship between temperature and resistance, and outputs a 4-20mA constant current signal that is linearly related to the measured temperature after the V/I conversion circuit.
The temperature transmitter is generally composed of circuit units such as a reference source, cold end compensation, amplification unit, linearization treatment, V/I conversion, disconnection treatment, reverse connection protection, and current limiting protection. It is to amplify the thermoelectric potential generated by the thermocouple through the cold end compensation, and then use the linear circuit to eliminate the nonlinear deviation between the thermoelectric potential and temperature, and finally amplify it and convert it into a 4-20mA current output signal. In order to avoid accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the transmitter is also equipped with a power-off protection circuit. When the thermocouple wire is broken or the connection is poor, the transmitter will output the maximum value (28mA) to cut off the power supply of the instrument.