I haven’t used a 4-20mA sensor since college (+10 years ago) but I would like to use one for my next project. I wish to input analog data from a 4-20mA hydraulic pressure sensor into my controller.
My controller will accept the 1-5V range I expect after sampling across the 250 ohm resistor. What I don’t remember how to do is set the current TO THE SENSOR at 20mA. Do I require a signal conditioner or power supply with exactly 20mA? If so I would appreciate any recommendation on small/cheap devices.
Thank you for any reply, I suspect this will be an easy question for most of the professionals on this site.