Resistance temperature sensor type rs-232 interface circuit diagram

inductance

This circuit can be used with a PC with an RS232 port. The sensor receives the working power from the RS232 port, the excitation current is only 500uA. The temperature range is 0~180 degrees Celsius, and the resolution is about 0.1 degrees Celsius at the 1Hz conversion rate. The PRT is connected in series with R1, R2, and R3, and R4 to form a bridge. The LT1013 amplifies the bridge's unbalanced signal. The output signal is transmitted to the PC via the IC2 and CD4052B multiplexers in conjunction with the RS232 port of the PC, and then converted to the corresponding temperature.