Pressure fluctuation calibrating device of pressure or differential pressure sensor and calibrating method thereof

Abstract

The invention discloses a pressure fluctuation calibrating device of a pressure or differential pressure sensor and a calibrating method thereof. The pressure fluctuation calibrating device comprises a main pressure container, a standard pressure sensor, a to-be-calibrated pressure sensor, a machine frame and a cylinder body fixedly disposed on the machine frame, wherein the standard pressure sensor and the to-be-calibrated pressure sensor are connected on the main pressure container, and the bottom of an inner cavity of the cylinder body is communicated with the main pressure container through a number two pipeline. A piston is disposed at the upper portion of the cylinder body, and a guiding flange is fixedly arranged on the outer wall of the top of a piston rod. The guiding flange takes a column of the machine frame as a guiding rail, and a displacement sensor is disposed on the guiding flange. The top of the machine frame is provided with a transmission mechanism which drives the piston rod to move vertically. The pressure fluctuation calibrating device and the calibrating method meet the pressure fluctuation calibrating requirement of the pressure or differential pressure sensor of the ordinary on-site environment.

Description

Technical field: [0001] The invention relates to a calibration device and a calibration method of a fluid pressure sensor, in particular to a simple, convenient and precise pressure fluctuation calibration device of a fluid pressure or differential pressure sensor and a calibration method thereof. Background technique: [0002] Pressure is one of the most basic parameters of the fluid. The pressure fluctuation measurement under a certain pressure or differential pressure is very important in many fields. The pressure fluctuation calibration of the pressure or differential pressure sensor is a very critical link; however, there is still a lack of simple, A convenient and precise pressure fluctuation calibration device and a corresponding calibration method. There are two calibration methods: One of the pressure calibration methods is to provide pressure through a pressure pump, and then use a standard pressure sensor to display the generated pressure. This method requires mor...

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Problems solved by technology

[0002] Pressure is one of the most basic parameters of the fluid. The pressure fluctuation measurement under a certain pressure or differential pressure is very important in many fields. The pressure fluctuation calibration of the pressure or differential pressure sensor is a very critical link; however, there is still a lack of simple, Convenient and precise pressure fluctuation calibration device and corresponding calibration method

There are two calibration methods: One of the pressure calibration methods is to provide pressure through a pressure pump, and then use a standard pressure sensor to display the generated pressure. This method requires more auxiliary equipment and a larger working environment. Large energy consumption and inconvenient to carry; the pressure generated by this method is mainly controlled by the overflow valve and pressure pump, and it is difficult to achieve fine adjustment of the pressure; at the same time, the pressure of this method is displayed through a standard pressure sensor. The accuracy of the measurement is completely determined by the accuracy of the standard pressure sensor. It is difficult to meet the pressure fluctuation calibration requirements of the pressure or differential pressure sensor without using an expensive standard pressure sensor

Another pressure calibration method is the piston type. The pressure is obtained by the ratio between the mass of the weight and the cross-sectional area of ​​the piston. In order to improve the measurement accuracy, it is necessary to eliminate the frictional resistance loaded on the piston. An auxiliary rotation mechanism is used to make the piston and A lubricating oil film is formed between the cylinders to reduce the coefficient of friction. This type of piston pressure device has many auxiliary equipment, has high requirements on the environment, and is expensive, so it is difficult to be widely used.

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