pressure monitoring

[under pressure]

What I am trying to do is monitor 10 to 20 pressure readings and ambient temperature every 6 hours from stand-alone pressure sensors from Motorola MPX501D. I want to take the readings and log then in a spreadsheet format and store them on the hard drive to down load later.

I have just purchased your DAQmx Chassis

2  NI 9205 32 Channel +/- 10 volts 250 kS/s 16 bit Analog input Modules 

1  NI 9211 4 channel thermocouple Module.

Do you have any suggestions on how to do it quickly and efficiently.

[devchander]

I have just purchased your DAQmx Chassis

You meen a cRIO chassis??

Assuming you already have and will use LabVIEW, labVIEW RT and LbVIEW FPGA, this tutorials will help you in cRIO Application Development

Understanding this tutorials would be the quick and efficient approach to start building your application

Hope this helps

Dev

Message Edited by devchander on 09-07-2006 11:09 PM

[Jesse_O]

Hello,

Are you are using a cDAQ chassis with your 9205 and 9211?  Also, from your post it appears that you only want to take samples from your pressure and temp sensors every 6 hours.  If this is true, you could simply use the DAQ Assistant to perform a single point software timed analog input where you specify your 10-20 sensors in the channel list.

If you do not want to use the DAQ Assistant in LabVIEW there are plenty of DAQmx examples in Example Finder under Hardware Input and Output >> NI-DAQmx >> Analog Measurement.  You would need to combine several of these together for your application.

From you post, the easiest solution would be to use the DAQ Assistant.  There are some situations where you need to perform more complicated operations than the DAQ Assistant is capable of, however from the description you provided I would use it.

To control how often the DAQ Assistant runs, you can use LabVIEW timing VIs, cast structures, etc.

I hope this helps,

Jesse O.
Applications Engineering
National Instruments

[under pressure]

Yes I have Labview8.1 and I just received your cDAQ-9172 USB 2.0 Chassis

[Jesse_O]

Hello,

Since you are using LabVIEW 8.0.1 with the cDAQ-9172 everything I mentioned before should apply.  The simplest way to acquire data and save it to a file is to use the DAQ Assistant and the LabVIEW Write Measurement File VI.

For more information on the DAQ Assistant and NI-DAQmx, there is a good online document found here.  You can find the DAQ Assistant under the Measurement IO >> NI-DAQmx palette.

The LabVIEW write to measurement file is located under the express >> output palette.  There are example in NI Example finder demonstrating how to use this ( or found here labview\examples\express\Cycle Analysis.vi).

Have a great day.

Jesse O.
Applications Engineering
National Instruments