Arduino connection to 4-20ma gas sensor

Hello,
I'm interested in connecting TOC-903-X5 gas transmitter to Arduino to log the gas levels over time.

I'm having trouble understanding how to wire the analog wire from the transmitter. In all the drawings I've seen there are only 2 wires and you need to connect a 250ohm resistor to change the 4-20ma signal to 0-5V the Arduino can read.

Is it the same case here? just connect a 250 ohm resistor to the analog wire and than straight to the Arduino?

Thanks for the help

7 posts - 3 participants

Read full topic