Differential Pressure Sensing

[abuhafss]

Hi

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

 

[Alec_t]

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.

 

[abuhafss]

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?

 

[Alec_t]

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.

 

[abuhafss]

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.

I am trying to measure the differential pressure across a venturi tube between A & B but I also need the pressure at B.

 

[Alec_t]

I think you'll need two sensors: one for A/B diff pressure and one for B gauge pressure.

 

[abuhafss]

I think you'll need two sensors: one for A/B diff pressure and one for B gauge pressure.

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.