Method for performing pressure fluctuation calibration on differential pressure transducer

Abstract

The invention discloses a method for performing pressure fluctuation calibration on a differential pressure transducer. A pressure fluctuation calibration device comprises a main pressure container, a standard pressure transducer, a rack and a cylinder body, wherein the standard pressure transducer is connected to the main pressure container, and the cylinder body is fixedly arranged on the rack. The bottom of an inner cavity of the cylinder body is communicated with the main pressure container through a second pipeline. The upper portion of the cylinder body is provided with a piston, and a guiding flange is fixedly arranged on the outer wall of the top of a piston rod. A stand column of the rack is used as a guide rail of the guiding flange, a displacement transducer is arranged on the guiding flange, and a transmission mechanism driving the piston rod to vertically move is arranged on the top of the rack. According to the pressure fluctuation calibration device and the calibration method, the fluctuation calibration requirements of the pressure of the usual on-spot environment or the pressure of the differential pressure transducer are met.

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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