In a hydropower station, the governor with a great shift of the oil pressure, frequent action, and simple designed automatic system and short of protection, brings various unsafe factors to the unit operation. It is essential to solve the problems and increase efficiency to make the operation run safe and stable.

The smart instrument with new generation fieldbus technology is an indispensable field device in process control, supporting mainstream industrial bus protocols such as HART, Foundation Fieldbus, PROFIBUS PA, PROFIBUS DP, etc. It can be used for the acquisition and control of temperature, pressure, current and other signals at industrial sites, and is suitable for various industrial control environments.

Pressure sensors in high temperature extreme environments Some harsh industrial environments have a wide range of needs for high temperature pressure transmitters, so the research of high temperature pressure sensors is also an important topic.

The research on pressure transmitter mainly focuses on the following aspects: ① Pressure transmitter communication methods. ② Pressure sensors in high temperature extreme environments. ③ Pressure transmitter with self-diagnosis function. ④ Pressure transmitter temperature compensation method. ⑤ Pressure transmitter other aspects of the research progress.

Pressure transmitters are mainly categorized into adiabatic pressure transmitters, gauge pressure transmitters and differential pressure transmitters.

NCS-PT105Ⅱ series Smart Pressure Transmitter: with advanced mature, reliable 3151 capacitance sensors has been designed meticulously by combining advanced microprocessor technology and digital capacitance measurement technology.

The application principle of the pressure transmitter can be clearly and point by point summarised from the following aspects

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