The temperature sensor has the advantages of simple structure, wire saving, large output signal, strong anti-interference ability, good linearity, simple display instrument, shockproof and moisture-proof solid module, reverse connection protection and current limiting protection, and reliable operation. The output of the temperature sensor is a unified 4 ~ 20mA signal; It can be used in conjunction with microcomputer systems or other conventional instruments. Can also be made into explosion-proof or fire-proof measuring instruments according to user requirements.
temperature sensor
Thermal resistance temperature transmitter consists of reference unit, R/V conversion unit, linear circuit, reverse connection protection, current limiting protection and V/I conversion unit. After the thermal resistance signal of temperature measurement is converted and amplified, the nonlinear relationship between temperature and resistance is compensated by linear circuit, and a constant current signal of 4 ~ 20 mA with linear relationship with the measured temperature is output by V/I conversion circuit.
Temperature transmitter is generally composed of reference source, cold end compensation, amplification unit, linearization processing, V/I conversion, decoupling processing, reverse connection protection, current limiting protection and other circuit units. The thermoelectric potential generated by thermocouple is amplified by cold end compensation, and then the nonlinear error between thermoelectric potential and temperature is eliminated by linear circuit, and finally amplified and converted into 4 ~ 20 mA current output signal. In order to prevent accidents caused by temperature control failure caused by thermocouple disconnection, the transmitter is also equipped with power-off protection circuit. When the thermocouple is damaged or poorly connected, the transmitter will output the maximum value (28mA) to cut off the power supply of the instrument.