Connecting 4-20mA Sensor Transmitter to 1762-IF4 card

I've got a 1762-IF4 w/ a micrologix 1200 and I'm using a 4-20mA transmitter in order to hook up pH and conductivity to the plc. The transmitter I'm using is http://www.omega.com/manuals/manualpdf/M3872.pdf

Note on Page 2 under the bold heading "Output", it shows a connection diagram in order to supply the transmitter output with the necessary power. The connection goes pH output S1 (-) --> 1762-IF4 card In(-), 1762 IF4 card In(+) --> 16VDC power supply. pH Output 0 is then tied with the power supply ground.

I've hooked this up to my IF4 card as shown but the I:2.0 corresponding file is reading like 0, -2, -3, -5, 2, when in reality it should be 4mA min , so it should be above 6241.

Am I missing something?

Have you put a meter in series with the input card to see what millamps you actually have?

Is the cards dip switches set for current?

power supply ground

Click to expand...

Power supply ground or power supply common?

How do you have the card configured? see pdf below

Thanks for the help Mickey. I figured out two problems, first the card connection was faulty. I had already measured 12mA across the card but when I tested again I found that the screw terminals were causing the the reading to drop to zero sometimes, so I adjusted those. Additionally, the polarity was backwards.. I've fixed it and its working fine now.

Thanks!

Thanks for coming back with your solution(s). Good to hear all is well.