What is a Differential Pressure Sensor?

The differential pressure transducer measures the pressure difference between two points. The difference between differential pressure sensors and general pressure sensors is that they have two pressure interfaces. Differential pressure sensors are generally divided into positive pressure end and negative pressure. In general, the pressure of the positive pressure end of the differential pressure sensor should be greater than the pressure of the negative pressure section to measure.

How Does Piezoresistive Differential Pressure Sensor Work?

The piezoresistive differential pressure sensor applies the two pressures to be measured to the diaphragm with piezoresistive elements on both sides. Upon sensing the pressure, the corresponding diaphragm deforms and causes a change in the resistance of the piezoresistive element. Differential pressure is measured using the change in resistance of a piezoresistive element across a curved diaphragm.

It is important to note that most differential pressure sensors are designed to measure lower differential pressures, not high differential pressures, that's why the range of differential pressure sensors is 0~0.35 bar... 35 bar. High differential pressure measurements can be made using two independent pressure transducers and the difference is calculated.