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I want to measure  /- 62.5 pascal from MPXV7002DP sensor. How can i accomplish that with good repeatability ?

Question asked by Zeeshan Noorwala on Aug 13, 2017
Latest reply on Aug 16, 2017 by Zeeshan Noorwala

I want to measure  +/- 62.5 pascal (+/- 0.25 inch H2O) from MPXV7002DP sensor. How can i accomplish that with good repeatability ?

 

From what i see in the datasheet, it gives 2500mV at 0 pascal, and +/- 1mV per pascal on the positive or negative side.

I am assuming to follow these steps :

 

1) Using a Differential amplifier, subtract 2437.5 mV from the output signal of MPVX7002DP, this will result in 0mV at -62.5 pascal differential pressure - AND also result in 125 mV at +62.5 pascal Diff. Pressure.

 

and then,

 

2) Add a gain stage of x24, so the resultant max 125mV will become 3000mV, which is the upper range of my  ADC.

 

However, my problems are :

 

A) Is this the right approach ?

B) how do i generate a precise reference of 2437.5 mV for the differential amplifier ?

C) The graph of output voltage from the sensor shows different slopes at different temperatures. How do i accomodate for this in my design ?

 

Thanks for your help.

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