New high-precision temperature transmitter circuit

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In the circuit, platinum resistance is used as the temperature sensor, and the XTR101 ASIC is used. The output signal is 4~20mA. By adjusting R, the output upper limit is 20mA, fine-tuning R2 makes the lower limit of the range 4mA, and adjusting the size of R1 can make the transmitter output current. It is completely linear with temperature changes. The RL in the circuit is generally 250Ω, and both R1 and Rr are determined according to the range. The S8050 is designed to reduce the heat generation and stability of the XTR101. The 1N4148 is used for reverse polarity protection of the power supply.