Wiring question on the 1-Channel 4-20mA Current Loop Receiver


Hi all,

I recently purchased the 1-Channel 4-20mA Current Loop Receiver (click) and had a quick question on how i’m supposed to wire this up to an existing 4-20ma loop to read sensor data.

The existing loop has a pt100 transmitter and a 20-420C 3-wire RTD. When I put a multimeter in series i get the expected 5.13ma at room temperature so i know the loop is working properly. To read the loop current with the current loop receiver i tried putting it in series after the pt100 but I am getting a very low current reading, 0.041. How should this be wired?

FYI, i’m using an Adafruit Feather Huzzah and following the tutorial here.




whats the operating voltage of the pt100 transmitter ?



I’m supplying 24v to the loop.


the board has on board supply. it wont need an external power supply.
You can directly connect the 4-20mA current loop vin and gnd to pt100.


OK. Maybe I purchased the wrong product. What should I use to read current in an existing loop?


This one


This board has a external power input… i cant find the input voltage… might be 24v ?? (Industry standard)


The DC input voltage range is 6V to 32V.