Automatic verification system and method for pressure transmitter

A transmitter and pressure technology, which is applied in the direction of measuring fluid pressure, instruments, force/torque/power measuring instrument calibration/testing, etc., can solve the problems of low verification efficiency, achieve convenient reading, no need for manual reading, and improve verification efficiency effect

Inactive Publication Date: 2021-02-12
西安航天计量测试研究所
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Problems solved by technology

[0003] The purpose of the present invention is to provide a pressure transmitter automatic verification

Method used

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  • Automatic verification system and method for pressure transmitter

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Example Embodiment

[0046]The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0047]Such asfigure 1As shown, the pressure transmitter automatic verification system of this embodiment is composed of a pressure pump, a stepping motor, a standard pressure gauge, a digital multimeter and a computer. The signal receiving end of the stepping motor is connected to the computer, and the rotating shaft of the stepping motor is connected to the computer. The piston rod of the pressure pump is connected, the pressure transmitter and the standard pressure gauge are both connected with the pressure pump; the computer is connected with the pressure transmitter through a digital multimeter, and at the same time is connected with the standard pressure gauge. The standard pressure gauge in this embodiment is a high-precision digital pressure gauge with communication interface and data storage functions. The standard pressure gauge is a high-precision digital p...

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Abstract

The invention provides an automatic verification system and method for a pressure transmitter. The automatic verification system and method are used for automatically verifying indication errors and return stroke errors of the pressure transmitter. The system comprises a pressure pump, a stepping motor, a standard pressure gauge, a digital multimeter and a computer; the computer is used as a corecontrol unit, and according to an input set pressure value, the computer can control forward (reverse) rotation of the stepping motor by analyzing a difference value between the set pressure value anda current pressure value so as to increase (reduce) the pressure of the system to the set pressure value. The system pressure can be maintained within a certain error range through a certain closed-loop control algorithm, and then a reference pressure source is provided for the detected pressure transmitter. After the system pressure is stabilized, the computer reads the output current value of the pressure transmitter from the digital multimeter and records the verification data of each verification point according to the format required by the verification regulation. Finally, the automaticverification of the indication error and the return error of the pressure transmitter is completed.

Description

technical field [0001] The invention relates to a verification of a pressure transmitter, and is especially suitable for batch automatic verification of indication error and return error of the pressure transmitter. Background technique [0002] Section 7.3.3 of JJG882-2019 "Pressure Transmitter Verification Regulations" stipulates the verification operation steps of pressure transmitter indication error and return error. The process is briefly described as follows: (1) Determine the verification point and cycle times according to the accuracy level and measurement range of the pressure transmitter; (2) Connect and install the standard device and supporting equipment according to the specified requirements; (3) Transmitter Input the pressure signal smoothly from the lower limit to each verification point, read and record the output value until the upper limit of measurement. Then change the pressure signal smoothly to each verification point in the opposite direction; (4) C...

Claims

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Application Information

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IPC IPC(8): G01L25/00G01L27/00
CPCG01L25/00G01L27/00
Inventor 白伟邓鹏波黄建明张明达刘蒙蒙李玉
Owner 西安航天计量测试研究所
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