I just tried to use two different ones of these RTD transmitters with a pt100 probe (3 wire) with no success.
I am connecting the transmitter directly to a 4-20mA input on a PLC, as shown in the following circuit diagram. Using 24VDC supply.
However, the unit always flows around 32mA through the current loop, no matter what temperature the probe is, or whether the probe is even connected. This exact same thing has happened with two of these transmitters. I assumed the first one was bad, but then when the second one did the same thing, I started to wonder what I had done wrong.
Any advice appreciated.