Connecting a 4-20mA signal to the ML1100 0-10V Analog Input

Blue92 · May 24, 2020

Just asking for clarification here, but from my research all I need is a 500 ohm resistor across the AI and the common? Heres my schematic.

I understand a 250 ohm resistor will yield a 1-5v range, but why use one over the 500 ohm? I have a few of both coming to me this week to play with, along with a 4-20mA air pressure sensor.

RET · May 24, 2020

500 ohm will give you better resolution.

Blue92 · May 24, 2020

Got a picture of my schematic up.

Mickey · May 24, 2020

Blue92 said:
Got a picture of my schematic up.

That should work. Would need to know what the sensor is to be sure though.

I do have one issue ,the label on the source power supply (+24- -24)
if it is then that's 48v. Most likely it 0- +24 vdc (hopefully)

Blue92 · May 24, 2020

Mickey said:
That should work.

I do have one issue ,the label on the source power supply (+24- -24)
if it is then that's 48v. Most likely it 0- +24 vdc (hopefully)

Yeah slight mistake on my part.

parky · May 25, 2020

I'm assuming that the analogue card is set to passive and this is a two wire sensor, then it is correct. if it was a 3 wire sensor then just feed the 24v to the +, ov to -(OV) of the sensor then the out to +in & OV to Com. with 500 ohm resistor across the analogue +in & 0V

Connecting a 4-20mA signal to the ML1100 0-10V Analog Input

Blue92

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