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The sensitive chip of the semiconductor material is packaged in the casing of the stainless steel corrugated diaphragm by ISO technology, and the silicone oil is filled between the stainless steel corrugated diaphragm and the chip. The chip leads are led out through the housing and sealed to prevent the silicone oil from leaking out or the outside pressure medium penetrating into it, so that the chip, silicone oil, housing and leads form a pressure sensor. When the sensor is in the pressure medium, the medium pressure acts on the corrugated diaphragm to pressurize the silicone oil therein, and the silicone oil transfers the pressure of the diaphragm to the semiconductor chip. After the chip is pressed, its resistance value changes, and the resistance signal is led out through the lead. The stainless steel corrugated diaphragm housing is pressurized and protects the chip, so the piezoresistive pressure sensor senses pressure signals in corrosive media. [1] 
Piezoresistive pressure sensors are typically connected to the Wheatstone bridge via leads. Usually, the sensitive chip has no external pressure, and the bridge is in equilibrium (called zero position). When the sensor is pressed, the chip resistance changes and the bridge loses balance. If a constant current or voltage supply is applied to the bridge, the bridge will output an electrical signal corresponding to the pressure, so that the resistance change of the sensor is converted to a pressure signal output through the bridge.
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