Configuring 2 wire 4-20ma transducer with NI 9219 and Daq Assistant

[PAI_Engineer]

Hi, I'm having trouble setting up an Omega Dyne Transducer with the NI 9219.  I've got a workable program now using Daq assistant with potentiometers instead of transducers but I'm having trouble making the switch.  Can anyone outline some steps I need to take to wire them up correctly and configure the Daq assistant?  I'm using and omegadyne px319-100AI with a 4-20ma output. http://www.omega.com/Pressure/pdf/PX309_mA.pdf

[WillPwr]

Hello, Robert!

The easiest way to make the switch is to compare your current code to an example written for a pressure transducer. One such example can be found in the LabVIEW Example Finder. In LabVIEW go to Help»Find Examples»Hardware Input and Output»DAQmx»Analog Measurements»Pressure»Cont Acq Pressure Bridge Samples (with Calibration).vi

The main part of the code you'll need to change is the DAQmx Create Channel, noted in the blue box above. Use the drop down menu to change from your current task type to a pressure task. You'll also need to change the inputs as necessary - the physical channel to measure from, any scaling, etc.

It may be useful to start from a new pressure example rather than converting from your old code. This particular example includes some extra features such as calibration and different scaling options, so it's really up to your own personal preference and application.

Please let us know if you have any questions on the above!

[Process_Systems]

https://www.ni.com/docs/en-US/bundle/ni-9219-getting-started/page/overview.html

Also, this is the link for the user manual for the 9219. It shows the terminals/assignments, you will need 4 and 6 only. Commect the POS lead of your tx to the a + 24 V dc supply, and the NEG term of your tx to the HI of the 9219. Connect the LO term to the neg term of the 24 vdc supply to complete the loop. As for configuration. the previous post pretty well covers it. Just make sure that you are configured for current input. Good luck.

Dave