Dear friends,
I am working on reading 4-20 mA from Level/pressure/flow transmitters. I used to use a 10 ohm resistor in series. so I measured the voltage drop on the resistor but in this circuit I needed the ground from the transmitter device. Is there a better method not using ground wire from the transmitter?
Ah yes - there are a few customers who do use 4-20 equipment still. But so long since I had to use one myself I had forgotten that the voltage source can be on either side, so the sensor just burns a varying amount of current.