Pressure Sensors In Petrochemical Applications

The digital pressure transmitters are one of the most popular automated measurement equipment in petrochemicals. In large-scale chemical projects, digital pressure transmitters are commonly used to measure differential pressure, absolute pressure, gauge pressure, high pressure, differential micro-pressure, high temperature, low temperature, and so on. Take the BASF benzene project as an example：

The project uses nearly 480 different types of digital pressure transmitters. During the project preparation stage, experts and engineers from the preparation department hope all pressure transducer can operate reliably without failure for at least two years.

Stable and reliable pressure indicator transmitters are the guarantee for a modern production process. In the event of metering errors or even downtime, the ensuing economic losses would be incalculable. The stability and reliability of pressure indicator transmitters have become the primary requirements for pressure indicator transmitters in the petrochemical industry.

Usually, the measurement of the digital pressure transmitter will produce zero drift with the working environment and static pressure changes. This drift may be more serious during the small pressure or differential pressure measurements. Maintaining the stability of production and the accuracy of measurement results under different working conditions is a sign of the stable performance of pressure indicator transmitters, and is also a requirement for the stability of pressure indicator transmitters in the petrochemical industry.

Based on stability and reliability, high accuracy is a higher requirement for pressure transducer sensors in the petrochemical industry. The accuracy of control depends on the accuracy of measurement in the control process. The higher the measurement accuracy, the higher the control accuracy. At present, the accuracy of most digital pressure transmitters can reach 0.075%, which can meet the measurement accuracy requirements of the petrochemical industry.

In addition, the petrochemical industry has many other requirements for digital pressure transmitters. For example, increase the range ratio. Increasing the range ratio can increase the flexibility of the digital pressure transmitter, which brings convenience for both design and application. When the design of certain reaction conditions in the process changes, for example, the range ratio of the pressure indicator transmitter is larger, it means that the digital pressure transmitter is more versatile. At the same time, a large number of range ratios can reduce the types of pressure indicator transmitters used in a project, reducing spare parts inventory and capital backlog.

The demand for digital pressure transmitters in the petrochemical industry mainly focuses on reliability, stability, and high accuracy. The stability and measurement accuracy of the digital pressure transmitter is mainly determined by the stability and measurement accuracy of the pressure transducer sensor. The measurement accuracy of the pressure transmitter corresponds to the measurement accuracy and response speed of the pressure transducer sensor. The stability of the pressure transmitter corresponds to the temperature characteristics, static characteristics, and long-term stability of the pressure transducer sensor. The demand for pressure transmitters in the petrochemical industry is reflected in the four aspects of measurement accuracy, fast response, temperature characteristics, static pressure characteristics, and long-term stability.

Micro pressure transducer sensor is a new type of pressure sensor developed using semiconductor materials and MEMS technology. Compared with traditional pressure transducer sensors, micro pressure transducer sensors have the advantages of high accuracy, high sensitivity, good dynamic characteristics, small size, corrosion resistance, and low cost. The micro pressure transducer sensormade of pure monocrystalline silicon has good long-term stability. At the same time, the micro pressure transducer sensor is integrated with the micro-temperature sensor, which increases the temperature compensation accuracy and greatly improves the temperature characteristics and measurement accuracy of the pressure transmitter sensor. If two micro-pressure sensors are integrated, static pressure compensation can be realized, thus improving the static pressure characteristics of the pressure transducer sensor. It can be seen that micro-pressure sensors have many advantages that traditional capacitive pressure sensors do not have. It can well meet the needs of pressure sensors in the petrochemical industry.