to all....I'm using this to monitor AC line voltage for sags and swells. It is not a PQ (power quality) monitor....that takes a lot more. Just used for an alert for brown-outs etc. . I was told the sensor is standard 4-20mA loop, but when I got the sensor...it does indeed have the 4-20 input, but ALSO has a 0-5 vdc sense.
I bought a 0-5 vdc to 4-20 ma adapter board on Amazon, which I planned to use...but now that I see the sensor already HAS the 0-5.....I can skip that!! I grabbed one of the wal warts mentioned here from Jameco. It is advertised as a 5Vdc UNREGULATED supply. That would be PERFECT!!!! Got it today, but checked it out...it's pretty darn well regulated! shows 5.023 volts from 80-130 ac volts input. RATS!!! So, I'm back to my original idea of using the AC wal wart...a diode and cap and a little box, to get me my crappy 5 volts unregulated for the 0-5 volt sensor. Then the application lets you match up, for example 5 volts is 130, 4 volts is 120, 3 volts is 110.....something like that.