Pressure sensors are widely used in injection molding machinery plants, water plants, oil refineries, sewage treatment plants, building materials, light industry, machinery and other industrial fields to achieve the measurement of liquid, gas, and vapor pressure. In addition, the pressure sensor is one of the most used measuring devices in the automatic control of the petrochemical industry. In large-scale chemical projects, almost all pressure sensor applications are included: differential pressure, absolute pressure, gauge pressure, high pressure, micro differential pressure, high temperature, low temperature, and remote flange pressure sensors of various materials and special processing . Almost the petrochemical industry's demand for pressure sensors is mainly concentrated in three aspects: reliability, stability and high precision. Among them, reliability and many additional requirements, such as turndown ratio, bus type, etc., depend on the transmitter's structural design, mechanical processing level and structural materials. The stability and high accuracy of the pressure transmitter are mainly guaranteed by the stability and measurement accuracy of the pressure sensor. The measurement accuracy of the pressure transmitter corresponds to the measurement accuracy and response speed of the pressure sensor, and the stability of the pressure transmitter corresponds to the temperature characteristic, static pressure characteristic and long-term stability of the pressure sensor. The petrochemical industry's demand for pressure sensors is reflected in four aspects: measurement accuracy, rapid response, temperature and static pressure characteristics, and long-term stability.