EPRO传感器PR9268-300-000配前置器

EPRO传感器PR9268-300-000配前置器

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。

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