Is NI 9233 suitable for ICP pressure sensors (e.g., PCB 113B28)?

[HenrikW]

 

Hi 

I am looking for a dynamic pressure sensors for my experiments, but I am not sure if it will work well with my DAQ (NI 9233)

Let’s say I am going to use PCB 113B28 (data sheet is attached below). First, I will be using it to measure sound pressure in a resonance tube where the frequency is between 100 and 500 Hz and pressure amplitudes will be in range of 200 Pa to 3000 Pa which is much smaller than the full scale output of the sensor. The sensor has a resolution of 7 Pa which is low enough I guess. However, the sensor sensitivity is 14.5 mV/kPa and this implies that the input in mV to the the NI 9233 will be very low. Is that okay? 

I believe that NI 9233 is 24 bits which means that it should face no issues with such low voltages, but I am not sure if this would change based on the aforementioned conditions (e.g., frequency of sound wave) 

one more info is that I’d like to measure at least 2000 samples per second. More than that is also fine.

[santo_13]

Compliance voltage is not high enough to drive the sensor.

Sensor requires 22-30VDC whereas the card can supply only up to 19V. You need to use an external IEPE signal conditioning module.

[HenrikW]

Thanks for the reply. 

Based on the following article from NI:

Excitation and Compliance Voltage for IEPE Sensors in NI Cards - NI

" What if my sensor’s Excitation Voltage exceeds the Compliance Voltage specification? 
If you are measuring signals across the full scale range of the sensor, then your signal may experience clipping. If you are measuring smaller magnitude signals, and the output bias voltage plus the peak signal voltage plus any common-mode voltage is less than the device’s Compliance Voltage specification, then you are operating within the acceptable bounds for both the sensor and the measurement device. "

My measurements will be in range that is much smaller than the full range of the sensor (e.g., measuring a 10kPa pressure, while the maximum pressure that can be measured by the sensor is 344.7 kPa). In this case, I think my setup will work properly without any clipping. Am I correct?

If yes, are there any other issues I might face?

[santo_13]

If you're sure you would not use the full range of the sensor, then, it would work fine. You would get a better dynamic range if the input range of the instrument could be made smaller as your signal is still 145mV for 10kPa signal but the fixed range is 5V.