Capacitive pressure transmitter and pressure sensing system

Abstract

The invention discloses a capacitance pressure transmitter and a pressure sensing system. The capacitance pressure transmitter comprises a capacitance differential pressure sensor, a demodulator, a microprogrammed control unit (MCU) and a communication module. The demodulator is used for converting capacitance differential value which is generated by the capacitance differential pressure sensor into an analog voltage signal. The MCU is used for converting the analog voltage signal which is outputted by the demodulator into a digital voltage signal. Based on a zero pressure directive and a full pressure directive that the communication module receives, the MCU records the digital voltage signal that is outputted by the MCU when the communication module receives the zero pressure directive and the full pressure directive. The invention further provides a pressure sensing system utilizing the capacitance differential pressure sensor. The capacitance pressure transmitter and the pressure sensing system enable a function of remote calibration to be achieved through the combination of the communication module and the MCU.

Description

technical field [0001] The invention relates to a pressure transmitter and a pressure sensing system, in particular to a capacitive pressure transmitter and a pressure sensing system using the capacitive pressure transmitter. Background technique [0002] With the rapid development of science and technology, non-physical quantity measurement and control technology has been more and more widely used in aerospace, aviation, transportation, metallurgy, machinery manufacturing, petroleum, light industry, technical supervision and testing and other technical fields. [0003] In the production process, it is necessary to collect production variables in the production process, including pressure, temperature and flow, and then pass these data back to the central control for processing, and then adjust each link of the production process to optimize the production process of the entire product. [0004] However, zero position deviation and drift are technical problems to be solved f...

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Problems solved by technology

[0004] However, zero position deviation and drift are technical problems to be solved for all sensors that detect non-physical quantities in the production process.

Especially the current conventional pressure transmitter still adopts the method of on-site manual adjustment, but this method of recalibrating the zero position or full scale through the zero adjustment knob and other knobs is extremely inconvenient, time-consuming and laborious, and the knob itself is extremely difficult. fragile

[0005] Moreover, since the pressure transmitters commonly used in the industry must be verified by verification equipment after the product is installed, and the verification requires a lot of manpower, time and expensive verification equipment, this method of recalibration is extremely serious. The debugging time of the production line is prolonged, which is even more unfavorable for improving production efficiency

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