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NI9226 2 wire PT1000 LabVIEW 2018

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Hi There,

 

I am trying to write a VI that will read 8 x 2 wire PT1000 connected to NI9226.

 

For start, I've only connected the first three channels.

 

It seems that if I configure the DAQmx create channel AI temperature RTD for two-wire configuration then the DAQmx Read (Analogue DBL 1Chan 1Samp.vi comes up with an error;

 

Possible reason(s):

Requested value is not a supported value for this property. The property value may be invalid because it conflicts with another property.

Property: AI.ResistanceCfg
Requested Value: 2-Wire
Possible Values: 3-Wire, 4-Wire

Channel Name: Temperatures0

 

How do I successfully read 8 x analogue channels connected to 8 PT1000 RTD's?

 

I've attached my VI, please help!!

Regards

Mark

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I think what you'll have to do is  set it up for 3 wire and jumper in the 3rd terminal to one side.

Or set for 4 wire and jumper in both terminals, one to each side.

 

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Solution
Accepted by topic author Marken

Hi Marken,

 

in case of such problems you should read the datasheet of the DAQ module! (You probably should do this even before problems arise!)

 

It clearly states the NI9226 supports only 3-wire and 4-wire Pt1000 sensors.

(Why don't you fake a 3-wire sensor by connecting RTD- and COM?)

 

Best regards,
GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO
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Hi GerdW,

 

Thank you very much for your reply.

 

The suggested solution did the trick that I was looking for.

 

I can't help myself to mention that reassured I DO read the datasheet of the hardware before order and use. I could say gently that is a different situation that we engineers deal with. The card has been purchased for a different purpose by a different department. I was asked by my manager to see if I can connect some two-wire cheap PT1000 and read the temperature for a quick thermal test.

 

Again thank you for your time and have a lovely weekend.

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