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)
The flow sensor is a FLOTECH F6206-AIV-DS
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?
You might want to take a look at the "Precision Digital" Model PD6720-0K1.
It is loop powered and doesn't require extra power wires or retransmit requirements. It also provides a NEMA 4X / IP65 enclosure. It also can display flow rate as well as totalizer with reset.
>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,