Electronic Pressure Sensors

To answer one question: gauge pressure is referenced to atmospheric pressure, taking atmospheric pressure as zero. However, atmospheric pressure is 14.68 psi as compared with full vacuum. Absolute pressure references vacuum as zero.

For further information, you could use "pressure transducer" as a search term. This is more common than "electronic pressure sensor."

Thanks

So lets go in deeper, when do we use absolute pressure transmitter and when do we use gauge pressure transmitter and when do we use diffrential pressure transmitter?

If the pressure to be measured can go below atmospheric pressure, an absolute pressure sensor would be used (otherwise, it would need to reverse polarity to send a negative signal). This is common in refrigeration applications.

If the pressure is sure to be atmospheric or higher, a gauge pressure sensor is fine, and probably less expensive. An absolute pressure sensor will also work.If the control logic compares one of these types with the other, a correction of 14.69 psi must be applied to one of the readings.

A differential pressure sensor would compare two pressures to each other, regardless of whether above or below atmospheric pressure.

Thanks Mr Tornado,

but why if the pressure to be measured is below atmospheric absolute gauge is choosed? we can use gauge also, here the reference is vacuum and here the reference is atmosphere! is it because sensitivity or what?

With a gauge pressure sensor, any pressure below atmospheric would need to register as a negative number.