Innovation of domestic pressure transmitters, a new generation of monocrystalline silicon pressure transmitters

• Categories:Industry information
• Time of issue:2017-11-23 19:40

(Summary description)　　Pressure transmitters are widely used in the industrial field. As an innovative product in the field of smart transmitters in the current process industry, monocrystalline silicon pressure transmitters are also known as composite micro-silicon solid-state sensors, smart transmitters and high-precision smart transmitters. It is favored by mainstream industrial enterprises.   　　Reform process of domestic pressure transmitter 　　During the three-line construction period of the last century from the 1960s to the 1970s, industrial enterprises blossomed everywhere in the central and western regions. At that time, industrial transmitters were already localized, and a large number of force-balanced DDZ-Ⅱ and DDZ-Ⅲ transmitters were used. The new generation of monocrystalline silicon pressure transmitter has low accuracy, poor performance stability and high failure rate. 　　With the opening of the country in the 1980s of reform and opening up, Xi’an Bi Watch Factory cooperated with Rosemount Company of the United States to produce 1151 series transmitters, setting a precedent for foreign transmissions to enter the Chinese market. Subsequently, Japan’s Fuji FC series and Hitachi EDR/EPR series transmitters were replaced by Shanghai No. 1 Automation Instrument Factory, Lanlian Instrument Factory, Dalian Instrument Factory introduced production. 　　More foreign brands entered China in the 1990s. Sichuan Instrument General Factory and Yokogawa Corporation jointly produce EJA series transmitters; ABB Corporation cooperates with China's Willtech Corporation to produce MV2000T smart transmitters; Japan Fuji and Zhejiang University Control Instrument Co., Ltd. cooperate to produce CXT transmitters; Siemens, German E+H, ABB and other companies have also established transmitter production lines in China. 　　Pressure transmitters are developing very fast, and they are basically innovated once every ten years. The above three eras can be roughly divided into three generations of analog, intelligent and fieldbus products.   　　Features of a new generation of monocrystalline silicon pressure transmitter 　　A new generation of single crystal silicon pressure transmitter. Its single crystal silicon is a single crystal of silicon with a diamond crystal lattice. It adopts cutting, grinding, polishing, photolithography, bonding, film shielding and other advanced technology and processes, which are sensitive to sensitive components. Processing. The product has significant advantages. 　　Excellent anti-interference ability. The Lige single crystal silicon pressure transmitter is fully isolated and packaged, and the single crystal silicon sensitive element is insulated and installed inside the sensor capsule, which can avoid the influence of measurement and environmental temperature changes, electrical interference, and mechanical vibration. 　　Excellent high frequency response capability. Monocrystalline silicon has its own properties, the natural resonance frequency exceeds 500Hz, and the pressure is transmitted to the sensitive components, which is immediately induced and converted into signal output. The overall response time does not exceed 5mS, which is suitable for high-frequency dynamic applications. 　　Strong anti-overload capability. Lige monocrystalline silicon pressure transmitter has double overload protection technology, the center diaphragm and isolation diaphragm form double overload protection. Even if the pressure is overloaded, the unique structure will not allow the filling liquid to be transferred to the sensitive components, thereby achieving overload protection. And it will not affect the measurement after returning to normal. 　　High-precision transmission. The sensor has a modular structure, and all calculated data are kept in the internal memory of the sensor capsule. In the subsequent production and maintenance, the transmitter module reads the memory data, which can achieve high-precision output.   　　Advantages of single crystal silicon pressure transmitter, capacitive pressure transmitter and diffused silicon pressure transmitter 　　The once-popular traditional capacitive pressure transmitter, although various watch manufacturers strive to improve performance, once attracted the attention of the market because of the selection of cost-effective isolated transmission modules. Mainly from improving the anti-interference ability of metal capacitors, but unfortunately the structural defects of short-circuiting with the outside cannot be completely changed. The fully isolated single crystal silicon sensor has a huge advantage in anti-interference. 　　Compared with the economical diffused silicon pressure transmitter with a large user scale, the monocrystalline silicon pressure transmitter has the advantage of being able to beat the dust under the condition of slight differential pressure. In the harsh environment of on-site working conditions, the advantages of monocrystalline silicon pressure transmitters