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Differential Pressure Sensing

Discussion in 'Microcontrollers, Programming and IoT' started by abuhafss, Nov 2, 2017.

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  1. abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    Hi

    I was wondering if I can use two separate pressure sensors like MPS20N0040D could be used to get differential pressure?

    [​IMG]
     
  2. Alec_t

    Alec_t

    2,843
    760
    Jul 7, 2015
    In principle, yes, but a lot would depend on the sensor characteristics. For example, if each sensor had a full-scale range of 10 bar and you were trying to sense a differential pressure of 2 or 3 bar it should be possible; but if the differential pressure of interest were only 2 or 3 millibar it would probably be impractical, because of sensor tolerances and temperature effects etc.
     
  3. abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    Okay.

    Next, will it be possible to determine the pressure at one of the ports of a differential pressure sensor, like MPXV7200DP. I mean, can we have the pressure sensed at A or B?

    MPXV7002DP_609-568x725.jpg
     
  4. Alec_t

    Alec_t

    2,843
    760
    Jul 7, 2015
    What pressure values are you trying to measure?
    If one port is open to atmospheric pressure, then the pressure measurement for the other port will be relative to atmospheric.
     
  5. abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    I am trying to measure the differential pressure across a venturi tube between A & B but I also need the pressure at B.
    Venturi-tube.gif
     
  6. Alec_t

    Alec_t

    2,843
    760
    Jul 7, 2015
    I think you'll need two sensors: one for A/B diff pressure and one for B gauge pressure.
     
  7. abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    If so then it would be better to use two single units similar to the one shown in post #1.
    But it has one disadvantage, the datasheet does not provide Output to Pressure relation. One has to determine by bench tests for each unit.
     
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