Help with 4-20mA output signal Sensor

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Thread Starter


Joined Dec 3, 2016
Hello, I have a Pressure sensor which its signal output is between 4-20 mA. I have a diagram of how to measure that current into labjack attached below also. I assume that the 4-20mA output signal changes as the "pressure" changes in the system. However, it is only changing when I change how much voltage is being supply. Why isn't the signal output changing as pressure changes?

These were a couple test I done.
1. I assume the 4-20mA output signal as a current source, and measure the voltage between the shunt resistor.
2. I measure the output signal with a ammeter without any resistance and the current did not change when the pressure changed.

My sensor is the DAR type.
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