How Does A Differential Pressure Sensor Work
The core part of the diffused silicon differential pressure transmitter is a diffused silicon pressure sensor. This sensor is formed by diffusing doped materials on the silicon wafer to form a piezoresistive effect load measuring element. When pressure is applied to the silicon wafer, the resistance value of the silicon wafer changes.
In a differential pressure transmitter, two pressure ports are connected to the two pressure points to be measured. When the pressure between two points is different, the silicon wafer will undergo slight deformation, causing the resistance value on it to change.
Changes in resistance on the silicon chip are converted into electrical signals. Typically an analog voltage or current signal (e.g. 4-20mA) that is proportional to the pressure change. This signal can be further processed and analyzed.
At the same time, diffused silicon differential pressure transmitters usually include temperature compensation functions. Since temperature changes will affect the accuracy of the sensor, the built-in temperature sensor is used to detect changes in ambient temperature and automatically adjust the output signal to ensure measurement accuracy.
