Temperatures from a Thermocouple

[Nishant Koti]

Hello All,

I have the PCI-4452 DAQ board. I would like to know if I could use this DAQ to read the temperatures from a Thermocouple. I have the amplifiers and also signal conditioning boards. I am working on LabVIEW-7.0.

Thanks

Nishant

[Nishant Koti]

I need help in this regard, Anticipating a reply, thanx.

Nishant

[Brian_Beal]

What amplifiers and signal conditioners do you have?

[Nishant Koti]

Brian,

I ahve SCH68 signal conditioner. My amplifier is of 10dB gain.

Can you recommend me a specific VI to get the temperatures from thermocouple.

Thanx

Nishant

[AnalogKid2DigitalMan]

Nishant- as far as I know, the SCH68 is just a cable, not a signal conditioner.

[Brian F.]

Hello Nishant. 

You can use the PCI-4452 to read temperatures from a thermocouple.  I would recommend measuring the input differentially.  The other advantage that the 4452 gives you are the software configurable input ranges.  Since you are measuring a thermocouple, as long as the temperature doesn't get too hot, you could use the .316 V range.  If you are measuring hotter temperatures, then you could use the 1 V range.  This will allow you to apply the 16 bits of resolution that the card provides across a smaller range and effectively increase your resolution even more. 

In terms of getting started with a program to take these measurements, I would recommend finding a simple analog input example program in our NI Example Finder.  NI Example Finder provides numerous VI's that are pre-built for basic applications.  There are many VI's which use the DAQ drivers to acquire a voltage on a channel, which could be used for your application.

Brian F
Applications Engineer
National Instruments 

[Brian_Beal]

Where is the cold-junction compensation taking place?