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I am figuring out how we can interface the flow meter to our controller before moving onto the software part. I have never worked with a 4-20mA interface hence just looking for some advice.

Below shows the connection diagram. enter image description here

I am able to power the flow meter via the 12 V supply from our controller. The P- and P+ is the pulse output but that's not what we are looking to use.

The CH-1 is the input channel that needs the 4-20mA output from the sensor to be fed. Where can I find this output on the flow meter or how do I go about the connection from an electrical point of view, with reference to the above sketch?

Here is the datasheet/manual for the sensor.

Any insights would be appreciated. Thank you.

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The transmitter can be set to sink or source as per diagrams Fig 15 or 16.

enter image description here

So typically you'd want to use "sourcing" and connect the (-) input to power supply ground and the current source output of the transmitter to the (+) input.

That's probably correct but without a datasheet for the controller it's not possible to be completely sure.

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  • \$\begingroup\$ I have made the above connections. How do I validate the connections and check the output? \$\endgroup\$
    – Vinay Divakar
    Commented Sep 28, 2021 at 3:46
  • \$\begingroup\$ Apply flow and check that the displays match? \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Sep 28, 2021 at 3:56

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