Monitoring a flow sensor over a 4-20mA signal

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Thread Starter

Eric

We have a customer that has a DCS that is monitoring a flow sensor over a 4-20mA signal. We do not have any info on their DCS.

They would like to add a local display(for the flow) out near the sensor. And the displays that would be used is a Omron# K3HB-XAD 24VAC/VDC with a option card inside of it that can transmit a 4-20mA as well (Omron# K33-L1A)

https://www.ia.omron.com/products/family/1535/specification.html

The flow sensor is a FLOTECH F6206-AIV-DS

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiKlcHf4NTWAhVNGsAKHWjEAFYQFgg0MAI&url=https://www.instrumart.com/assets/Flo-tech-Activa-Ultima-Classic-Quad-Sensor-Manual.pdf&usg=AOvVaw0n8qYNOYO8_A9v6tZDN6ae

My question is: Can i just add the Omron display in series between the flow sensor and the DCS, using the current + and - on the display?
or do i need to use the retransmit capabilities?
 
>My question is: Can i just add the Omron display in series between the flow sensor and the DCS, using the current + and - on the display? or do i need to use the retransmit capabilities?<

The short answer is Yes
But I agree with Feuchtde, get a modern 2 wire 4-20mA display

No you don't need to use the re-transmit option in fact avoid it.
I didn't try and verify the transmitter will handle the additional load (extra resistance) but it would be unusual to find a modern transmitter that can't handle at least 600 Ohms,

Roy
 
F

Fabricio Andrade

In short, yes you can do it without any problem.

Additionally, if your device is also HART, you can use a device such as the tri-loop to split the HART input in up to 3 analog output, and then the installation will look better.
 
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