Interpretation of the practical application of pressure sensors

A pressure sensor is a device that can sense a pressure signal and convert it into a usable output electrical signal according to certain rules. The pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. According to different types of test pressure, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, automatic production control, aerospace, military, petrochemical, oil well, electric power, ships, machine tools , Pipelines and other industries. The following are some application examples of pressure sensors.

1. Application of pressure sensor in weighing system In the commercial weighing system of industrial control technology, the application of pressure sensing technology is increasing. In many pressure control processes, it is usually necessary to collect pressure signals and convert them into electrical signals that can be automatically controlled. Pressure control devices made of pressure sensors are usually called electronic weighing systems. As an online control tool for material flow in various industrial processes, it is becoming more and more important. The electronic weighing system can not only optimize production and improve product quality in the manufacturing process, but also collect and transmit logistics data during the production process to the data processing center for online inventory control and financial settlement. In the automatic control of the weighing process, the pressure sensor is required to not only sense the gravity signal, but also have reliable performance, good dynamic response, and good anti-interference performance; the signal provided by the pressure sensor can be directly displayed, recorded, printed, stored or used by the detection system. For feedback regulation and control. The pressure sensor and measurement circuit are integrated through integration technology, which greatly reduces the volume of the entire device; in addition, with the development of shielding technology, the anti-interference ability of the weighing pressure sensor will be guaranteed, and the degree of automation control of the weighing process will be further improved .

2. Application of pressure sensor in petrochemical industry Pressure sensor is one of the most commonly used measuring devices in petrochemical industry automatic control. In large-scale chemical projects, almost all pressure sensors have applications, including: differential pressure, absolute pressure, gauge pressure, high pressure, differential pressure, high temperature, low temperature, and remote flange pressure sensors made of various materials. Almost the petrochemical industry's demand for pressure sensors is mainly focused on reliability, stability and high precision. Among them, there are many additional requirements for reliability, such as range ratio, bus type, and so on. Depends on the structural design of the transmitter, the level of processing technology 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 and response speed of the pressure sensor correspond to the measurement accuracy of the pressure transmitter, and the temperature characteristics, static pressure characteristics and long-term stability of the pressure sensor correspond to the stability of the pressure transmitter. 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.

3. The application of pressure sensors in water treatment China's environmental protection water treatment industry has developed rapidly in recent years and has broad prospects. In the process of water supply and sewage treatment, pressure sensors are used to provide important control and monitoring methods for system protection and quality assurance.

4. Application of pressure sensors in the medical industry. With the development of the medical equipment market, higher requirements are put forward for the use of pressure sensors in the medical industry, such as accuracy, reliability, stability and volume. Pressure sensors have good applications in minimally invasive catheter ablation and temperature sensor measurement. Minimally invasive surgery can not only reduce the trauma of the surgical site, but also greatly reduce the pain of the patient, and the recovery process is also fast. To meet such requirements, in addition to the doctor's surgical experience, it also has a variety of medical catheters including thermodilution catheters, urinary catheters, esophageal catheters, central venous catheters and intracranial pressure vessels. Not only has a conductive function, but also provides an important guarantee for pathological examinations and minimally invasive surgery for patients. Temperature and pressure parameters are the key parameters for successful surgery. For many applications, placing the sensor close to the patient is critical. For example, in dialysis applications, accurate measurement of dialysate and venous pressure is very important. The pressure sensor must be able to accurately monitor the pressure of the dialysate and blood to ensure that they remain within the set range. This type of application requires the sensor to be compact and able to withstand liquid media. In many cases, sensors that are not compatible with liquid media require additional mounting parts to protect them, which increases the volume, cost, and complexity of the product. The tolerance of liquid media is particularly important when monitoring the patient's breathing, because the sensor here must be able to withstand the patient's cough and moist air exhaled.