The sensor works on the principle of measurement of hydrostatic pressure. It generally uses a silicon pressure load cell sensor to convert the measured pressure into an electrical signal, and then is amplified by an amplifier circuit and compensated by a circuit, and finally outputted at a current of 4 to 20 mA or 0 to 10 mA.
However, in the field of sensor equipment, China's industry is still unable to meet the needs of market development. According to relevant sources, the current domestic sensor chips have been used on a large scale, such as bus cards, hotel room cards, and mobile phone near-field payment. However, high-end chips such as high-frequency and ultra-high-frequency, such as labels for wine and clothing, are still lacking compared with foreign countries, and further technological breakthroughs are needed. China has made some progress in low-end temperature and humidity sensors, but in terms of higher-end sensors, especially the high-end MEMS that integrates sensing, transmission and processing into small-sized chips, compared with foreign countries. There is still a big gap. The development of the sensor field has encountered difficulties, and it has caused considerable troubles for the promotion of the Internet of Things industry in China for some time. If foreign products are used, there may be many concerns about security.
