Introduction Of Integrated Temperature

The integrated temperature sensor is generally composed of a temperature probe (thermocouple or thermal resistor sensor) and a two-wire solid electronic unit. The temperature probe is directly installed in the junction box in the form of a solid module to form an integrated sensor. Integrated temperature sensors are generally divided into two types: thermal resistor and thermocouple.
The thermal resistor 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 measurement 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.
Thermocouple temperature sensor is generally composed of a reference source, cold end compensation, an amplifier unit, linearization processing, V/I conversion, disconnection processing, reverse connection protection, current limiting protection and other circuit units. It is to amplify the thermoelectric potential generated by the thermocouple after cold end compensation, and then eliminate the nonlinear error between the thermoelectric potential and temperature by a linear circuit, and finally amplify and convert it into a 4-20mA current output signal. In order to prevent accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the sensor is also equipped with a power-off protection circuit. When the thermocouple wire is broken or the connection is poor, the sensor will output the maximum value (28mA) to cut off the power supply of the instrument. The integrated temperature sensor has the advantages of simple structure, saving leads, large output signal, strong anti-interference ability, good linearity, simple display instrument, solid module anti-seismic and moisture-proof, reverse connection protection and current limiting protection, and reliable operation. The output of the integrated temperature sensor is a unified 4-20mA signal; it can be used with a microcomputer system or other conventional instruments. It can also be made into an explosion-proof or fire-proof measuring instrument as required by the user.