DAQ assistant won't recognize USB-6009 for analog pressure input

[dankospan]

Hi all,

I am using an OMEGA PX309 pressure transducer through a USB-6009 and I want to make a quick measurement using the DAQ assistant's Analog input pressure feature.

For some reason the DAQ assistant is not able to recognize the USB-6009 in the pressure feature, but is able to recognize it in the voltage feature (see two printscreens attached).

Thanks!

[GerdW · Accepted solution]

Hi dankospan,

when your pressure sensor outputs a voltage signal (or a current signal with a shunt resistor) you surely want to measure that voltage!

Just create a voltage measurement channel: you might apply a scale to convert voltage to pressure additionally…

"Pressure" channels are mainly intended for measuring (full) bridge-type sensors without internal electronics using an excitation voltage supplied by the DAQ device. Your USB6009 doesn't fall into this category!

Which kind of PX309 did you bought?

[dankospan]

I have a PX309-015G5V, as far as I know it doesn't have full bridge output.

Thanks for the prompt reply! 🙂

[GerdW]

Hi dankospan,

the PX309-015G5V measures upto 15psi and outputs 0-5Vdc.

So measure the voltage signal and scale it to a pressure value by multiplying by 3 (or by 20.68428 to get pressure in kPa :D)…

[csmcfetridge]

Thanks for the info. Could you please also identify the bridge type of the PX309-015G5V pressure transducer? (Full, half, quarter)

[RavensFan]

https://assets.omega.com/pdf/test-and-measurement-equipment/pressure/pressure-transducers/PX309.pdf

Does it matter?

Pressure gauges are probably almost always full bridge.  The bridge output version of this gauge seems to be.  But when the sensor is built for voltage output, the type of bridge inside really doesn't affect how you interact with it.