The pressure sensor is one of the most used measuring devices in the automatic control of the petrochemical industry. In large chemical projects, almost all pressure sensor applications are included: differential pressure, absolute pressure, gauge pressure, high pressure, differential pressure, high temperature, low temperature, and remote flange pressure sensors of various materials and special processing. . For example, the Yangtze BASF styrene project uses nearly 480 various types of pressure sensors . During the preparatory stage of the project, the experts and engineers of the project preparation department will be able to operate reliably all the sensors for at least 2 years without any malfunction.

At present, the pressure sensors used in China's petrochemical industry mainly rely on imports. Domestic pressure sensors still have a certain gap in terms of product types and functions. Realizing the localization of pressure sensors is of great significance to the country's economic and national defense security and the revitalization of national industries. This paper analyzes the typical localization of pressure sensors by comparing several typical pressure sensors used in petrochemical industry at home and abroad . Through efforts, we can break the monopoly position of pressure sensors based on MEMS sensors and realize the localization of pressure sensors in the petrochemical industry.

In the process of modern production, the reliable pressure sensor is a powerful guarantee for the production process. Once a metering error occurs, and even a downtime failure occurs, the resulting economic loss will be uncountable. Chaos and reliability of the pressure sensor becomes the primary needs of the petrochemical industry pressure sensor. Usually, the measurement of the pressure sensor will drift as the working environment and static pressure change. In some small pressure or differential pressure measurements, this drift is likely to be severe. Under different working premise, to get the most accurate measurement of the relative, so as to maintain the same chaos and ensure that the process of production, the pressure sensor is the embodiment of chaos, the petrochemical industry is also required for the pressure sensor of chaos. High precision is a higher demand for pressure sensors in the petrochemical industry based on non-disruptiveness and reliability. The accuracy of the control depends on the accuracy of the measurement during the control process. The higher the measurement accuracy, the higher the control accuracy. At present, the accuracy of most pressure sensors reaches 0.075%, which can meet the measurement accuracy requirements of the petrochemical industry. In addition, the petrochemical industry has many other needs for pressure sensors . For example, increasing the turndown ratio increases the flexibility of the pressure sensor and provides convenience for design and application. When the design of some reaction premise changes in the process flow, for example, the fruit transfer has a larger turndown ratio, which means that it has good versatility, and the change of the process premise does not affect the sensor model, which greatly reduces the number of sensors . Designed to modify the workload. At the same time, the large-scale ratio can reduce the types of sensors used in the project , reduce the inventory of spare parts, and reduce the accumulation of funds.

The petrochemical industry 's demand for pressure sensors is mainly focused on reliability, non-disruptiveness and high precision. Among them, reliability and many additional requirements, such as range ratio, bus type, etc., rely on the structural design of the sensor , the level of machining technology and structural materials. A pressure sensor with high accuracy and chaos mainly by the chaos and ensure measurement accuracy of the pressure sensor. The measurement accuracy of the pressure sensor corresponding to the measurement accuracy and response speed of the pressure sensor, the pressure sensor chaos phase corresponding to the temperature characteristics and static pressure characteristics of the pressure sensor and long-term chaos. The demand for pressure sensors in the petrochemical industry is reflected in the four aspects of measurement accuracy, rapid response, temperature characteristics and static pressure characteristics, and long-term non-disruptiveness.

The micro pressure sensor is a new type of pressure sensor fabricated using semiconductor materials and MEMS processes. Compared with the traditional pressure sensor, the micro pressure sensing has the advantages of high precision, high agility, good dynamic characteristics, small volume, corrosion resistance and low cost. The material of pure single crystal silicon is weak, and the micro pressure sensor made of this material has good long-term non-disorder. At the same time, the micro pressure sensor is easy to integrate with the micro temperature sensor, which increases the temperature compensation accuracy and greatly improves the temperature characteristics and measurement accuracy of the sensor. If two micro-pressure sensors are integrated, static pressure compensation can be realized, thereby improving the static pressure characteristics of the pressure sensor. It can be seen that the micro pressure sensing has many advantages that traditional pressure sensors do not have, and can well meet the demand of pressure sensors in the petrochemical industry.