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铂热电阻温度传感器是一种广泛应用的测温元件,在—50～600℃范围内具有其它任何温度传感器无可比拟的优势,包括精度高,稳定性好,抗环境干扰能力强等.由于铂热电阻的电阻值与温度成非线性关系,所以给一般用户使用带来一定困难,往往没有充分利用其高精度优势.本文介绍了适合于各种精度要求的铂热电阻温度传感器交换电路,对应于不同的精度要求可以选用不同复杂程度的电路方案.铂热电阻温度传感器的电阻值与温度的关系工为Rt=R_0(1+ar+bt~2),其中Rt:温度t℃时的电阻值,R_0:温度0℃时的电阻值,型号Pt100的铂热电阻R_0=100Ω,根据IEC-751标准,可近似取a=3.9685×
Platinum RTD temperature sensor is a widely used temperature measurement element, with any unparalleled advantages of any other temperature sensor in the range of -50 ~ 600 ℃, including high precision, good stability, strong resistance to environmental interference, etc. Due to The resistance value of platinum RTD is non-linear with the temperature, so it brings some difficulties to the general users, often do not take full advantage of its high accuracy.This paper introduces a platinum RTD temperature sensor exchange circuit suitable for various accuracy requirements, Corresponding to different accuracy requirements can choose different complexity of the circuit solutions. Platinum RTD temperature sensor resistance and temperature relationship Rt = R_0 (1 + ar + bt ~ 2), where Rt: temperature t ℃ Resistance value, R_0: resistance value at 0 ℃, Pt100 platinum RTD R_0 = 100Ω, according to IEC-751 standard, we can approximate a = 3.9685 ×