Application of measurement and control instrument in petroleum industry

    In the process of modern continuous production, stable and reliable measuring and controlling instrument is a powerful guarantee for the process of production. In the event of a metering error or even a failure, the ensuing economic losses will not be counted. The stability and reliability of the pressure transmitter become the primary demand of the pressure transmitter in the petrochemical industry.

    Normally, the measurement of the pressure transmitter will drift along with the change of the working environment and static pressure. In some small pressure or differential pressure measurements, the drift is likely to be severe. In different working conditions, the measured relative right, so as to maintain the stability and to ensure the consistency of the production process, is the embodiment of the stability of pressure transmitter, pressure transmitter and stability requirements for petrochemical industry.

    On the basis of stability and reliability, high precision is a higher demand for pressure sensors in petrochemical industry. The accuracy of the control depends on the accuracy of the measurement in the control process. The higher the measurement accuracy, the higher the accuracy of control. At present, the accuracy of most pressure transmitters is up to 0.075%, which can meet the requirements of measurement accuracy in petrochemical industry.

    In addition, the petrochemical industry has many other requirements for measuring and controlling instruments. For example, increasing the range ratio can increase the flexibility of the pressure transmitter and make it convenient for design and application. Design when some reaction conditions in the process of change, such as fruit, has a larger range than the transmitter means, has good universality, technology conditions of the transmitter model, greatly reducing the workload of design changes. At the same time, a large range ratio can reduce the type of transmitter used in the project, reduce the inventory of spare parts and reduce the backlog of funds.

    The demand of 3051 differential pressure transmitter in petrochemical industry is mainly concentrated in 3 aspects of reliability, stability and high precision. Among them, reliability and many additional requirements, such as range ratio, bus type and so on, depend on the structure design, machining process level and structural material of the transmitter. The stability and high accuracy of the pressure transmitter are mainly guaranteed by the stability and measurement accuracy of the pressure transducer. Corresponding to the measurement accuracy of pressure transmitter is the measurement accuracy of pressure sensor and response speed, corresponding to the stability of pressure transmitter is the temperature characteristics and static characteristics of pressure sensor and long-term stability. The demand of pressure sensors in petrochemical industry is reflected in 4 aspects: measurement accuracy, fast response, temperature characteristics and static pressure characteristics, long-term stability.

    Measuring and controlling instrument is a new type of pressure sensor which is made of semiconductor material and MEMS process. Compared with traditional pressure sensors, micro pressure sensors have the advantages of high accuracy, high sensitivity, good dynamic characteristics, small size, corrosion resistance and low cost. The material of pure monocrystalline silicon has little fatigue, and the micro pressure sensor made of this material has good long-term stability. At the same time, the micro pressure sensor is easy to integrate with the micro temperature sensor, increase the temperature compensation accuracy, and greatly improve the temperature characteristics and measurement accuracy of the sensor. If the 2 micro pressure sensors are integrated, static pressure compensation can be realized, thereby improving the static pressure characteristics of the pressure sensor. Therefore, the micro pressure sensor has many advantages that traditional pressure sensors do not have, and can well meet the demand of the petrochemical industry for pressure sensors.