Intelligent spring tube pressure transmitter

Abstract

The invention discloses an intelligent two-wire pressure transmitter with a spring tube as a pressure measurement sensitive element. The pressure transmitter comprises a spring tube and a displacement detection circuit which is connected with the spring tube; the displacement detection circuit is connected with an analog-to-digital conversion circuit; the analog-to-digital conversion circuit is connected with a microprocessor; the microprocessor is respectively connected with a display and a digital-to-analog conversion circuit; and the digital-to-analog conversion circuit is connected with apower source supply and output circuit. According to the intelligent spring tube pressure transmitter, disclosed by the invention, a mechanically driven appointer mechanism is removed on the basis ofthe traditional spring tube (also called bourdon tube) type pressure gauge; displacement signals generated by pressing force are converted into electric parameters through the displacement detection circuit; and size of the equivalent pressing force is thereby measured through measurement of the electric parameters. The electric parameters after being subjected to the A / D conversion and the digital processing of the microprocessor are displayed digitally, and 4-20 mA DC current signals are output. The intelligent spring tube pressure transmitter, disclosed by the invention, has the advantagesof low cost, high performance and wide market prospect.

Description

technical field [0001] The invention relates to the field of pressure detection, indication and control in the industrial production process, in particular to a spring tube intelligent pressure transmitter which converts the pressure into a standard 4-20mA direct current signal for output. Background technique [0002] In the industrial production process, pressure transmitters are usually used to convert the pressure into a standard 4-20mA DC current signal output, and then detect, display and control the pressure. Intelligent pressure transmitters widely used in modern industry use capacitive or semiconductor sensors, which have high precision and resolution, and have rich intelligent functions. However, due to the high manufacturing cost, it will increase a lot of expenses in some occasions. [0003] The indication accuracy and resolution of the traditional spring tube pressure gauge are limited by the principle and manufacturing process, and it can only be used as a pres...

AI Technical Summary

Problems solved by technology

Intelligent pressure transmitters widely used in modern industry use capacitive or semiconductor sensors, which have high precision and resolution, and have rich intelligent functions. However, due to the high manufacturing cost, it will increase a lot of expenses in some occasions.

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