3BSE008536R1

3BSE008536R1

3BSE008536R1

用PT100电阻温度传感器测量温度并监视温度

     本例讨论如下内容:用模拟量扩展模块EM235测量温度和监视温限，在该模拟量模块的一个输入通道上连接PT100温度传感器。

为了把PT100的随温度变化的电阻转换成电压，模拟量输出作为恒电流源而使用，即输出12.5mA随电流供给PT100传感器。在这个电路中，产生了5mV/0C的线性输入电压。EM235把这个电压转换成数字量，程序周期性地读这些数字量，并将所读的这些数，利用下面的公式计算出温度。

硬件描述

温度传感器:

PT100是铂电阻温度传感器，它适用于测量-60到+400度之间的温度。

计算PT100所需电流

PT100在0度时电阻为100，随着温度的变化电阻星线性变化，大约是每摄氏度0.4欧姆。

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