Two working principle of pressure transmitter

Piezoresistive:

Piezoresistive pressure transmitter uses a semiconductor or metal strain gauge.

When pressure acts on a pressure-sensing diaphragm, the diaphragm deforms, causing the strain gauge's resistance to change.

This resistance change is converted into a voltage signal using a Wheatstone bridge circuit.

Advantages: Fast response, high accuracy, and reasonable cost.

Applications: The most common type, suitable for most industrial applications.

Capacitive:

Capacitive ressure transmitter has a capacitor which consists of two electrodes, one of which is an elastic diaphragm.

Pressure deforms the diaphragm, changing the distance between the two plates and, consequently, the capacitance.

A circuit detects this capacitance change and converts it into an electrical signal.

Advantages: Excellent stability, low long-term drift, and overload resistance.

Applications: Applications requiring high precision and reliability.

For details, please contact Qi Huang: qihuang@utopsensor.com.