RTD Configuration

[NT_Engineer]

I am designing a system that reads and logs measurements from 3 RTDs. I am using the NI 9217 RTD to acquire the temperature readings and have been able to display the temperature readings in LabVIEW.  However, the temperature readings are not correct.  I know this has to do with the setup of the RTDs.  However, I am not sure if I need to select  PT3750 or the other preset types or use the custom.  The RTD model we are using is from Omega.com and is part # PR-10-2-100-1/4-12-E.  I have tried to find the A,B, and C coefficients from Omega.com, but all I can find is an alpha value of .00385.  How should I set up the RTD input for this model number?

[Chris_K_]

Hi NT

You would use the Pt 3851 and a Ro of 100.  I could not find a Iex Value A (execution current) from the omega website, so you may need to try different values or contact omega for this information.

The alpha value represents the ohm/ohm/'C, and the IEC 751 standard RTD, which is the type that you are using,  uses alpha=0.00385 (actually it is alpha=0.00385055 and in RTD task setup it is Pt 3851).

Have a look at the following link for more information

Chris

Message Edited by Chris_K_ on 09-02-2008 12:00 PM

[acanivell]

Maybe too late already,

But just for the record:

Create your TASK 

Place a DAQ Channel Properties node, and wire the task into it

In the DAQ channel properties node, select:

    analog input-temperature-rtd-custom-A and then B and C 

This way you can set the ABC parameters in your temperature TASK !

[AndreaD]

Hi Chris,

The link doesn't work anymore (I know, it's been years) - but would the information from the link be located somewhere else?

Thanks, 

Andrea

[Patricia B]

Hello,

I am unsure of the information you were seeking from the link in the earlier post, but here is what I found based upon the original question posed.

Creating Virtual Channels for RTDs in NI-DAQmx and Traditional NI-DAQ

http://digital.ni.com/public.nsf/allkb/225FA4989E95B4CB86256D520070713C?OpenDocument

Temperature Measurement with a Thermocouple or RTD

http://zone.ni.com/devzone/cda/tut/p/id/4252#toc4

Taking Temperature Measurements with RTDs: How-To Guide

http://zone.ni.com/devzone/cda/tut/p/id/7115

Hope this helps,

Patricia B.

 

[BenRoura]

Thx! More than 7 years after you posted it but it helped me!