Classification of pressure sensors and transmitters

1、Piezoresistive pressure sensor
RPT8100 resistance strain gauge is one of the main components of piezoresistive strain sensors. The working principle of metal resistance strain gauges is the phenomenon where the strain resistance changes with mechanical deformation due to adsorption on the substrate material, commonly known as the resistance strain effect.

2、Ceramic pressure sensor
Ceramic pressure sensors are based on the piezoresistive effect, where pressure directly acts on the front surface of the ceramic diaphragm, causing slight deformation of the diaphragm. Thick film resistors are printed on the back of the ceramic diaphragm and connected to form a Wheatstone bridge. Due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage signal that is proportional to the pressure and also proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3 mV/V depending on the pressure range, and can be compatible with strain sensors.

3、Diffuse silicon pressure sensor:
The working principle of RPT8100, RPT8200, ZY6000, ZY8000 series diffusion silicon pressure sensors is also based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic), causing the diaphragm to produce a micro displacement proportional to the medium pressure, resulting in a change in the resistance value of the sensor. The electronic circuit is used to detect this change and convert it into a standard measurement signal corresponding to this pressure.

4、Sapphire pressure sensor:
By utilizing the principle of strain resistance, silicon sapphire is used as the semiconductor sensitive element, which has unparalleled metrological characteristics. Therefore, semiconductor sensitive components made of silicon sapphire are insensitive to temperature changes and have good working characteristics even under high temperature conditions; Sapphire has strong anti radiation properties; In addition, silicon sapphire semiconductor sensitive components have no p-n drift.

5、Piezoelectric pressure sensor:
The piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurements because the charge generated by external forces is only preserved when the circuit has an infinite input impedance. The actual situation is not like this, so this determines that piezoelectric sensors can only measure dynamic stress.