Diffusion Silicon|Capacitive|Ceramic Differential Pressure Sensor Difference

1. The principle of capacitive pressure and differential pressure transmitter The capacitive transmitter has a variable capacitance sensing component. The sensor is a completely closed component. The process pressure, differential pressure is transmitted to the sensing diaphragm through the isolating diaphragm and filling liquid silicone oil to cause displacement. The capacitance difference between the sensing diaphragm and the two capacitor plates is converted into an electrical signal output by a two-wire system of (4-20) mA by electronic components. 2. The principle and application of ceramic pressure sensor The anti-corrosion ceramic pressure sensor has no liquid transmission, and the pressure acts directly on the front surface of the ceramic diaphragm, causing the diaphragm to deform slightly. The thick film resistor is printed on the back of the ceramic diaphragm, connecting It becomes a Wheatstone bridge (closed bridge), due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is based on the pressure range. Different calibrations are 2.0/ 3.0 / 3.3mV/V, etc., which are compatible with strain gauge sensors. Through laser calibration, the sensor has high temperature stability and time stability, the sensor has its own temperature compensation 0 ~ 70 ℃, and can be in direct contact with most media. 3. Principle and application working principle of diffused silicon pressure sensor The pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramics), causing the diaphragm to produce a micro-displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes. , and use the electronic circuit to detect this change, and convert and output a standard measurement signal corresponding to this pressure. Using the working principle of strain resistance, silicon-sapphire is used as the semiconductor sensitive element, which has good measurement characteristics.

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