Accurate method for verifying pressure of low-pressure instrument

A technology of instrument accuracy and pressure, applied in the field of low-pressure instrument pressure calibration, it can solve the problems of large pressure fluctuation, difficult pressure control, slow pressure increase, etc., to achieve the effect of small pressure fluctuation, easy pressure control, and rapid pressure increase

Inactive Publication Date: 2019-06-18
CHINA NAT CHEM ENG THIRD CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention of this application is to solve the problems of slow pressure rise, large pressure fluctuations and poor pressure co

Method used

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  • Accurate method for verifying pressure of low-pressure instrument

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Example Embodiment

[0021] like figure 1 As shown, the accurate method of checking low-pressure gauge pressure of the present invention comprises the following steps:

[0022] (a), connect the standard meter 1 and the meter 8 to be calibrated with the verification device respectively, and the verification device includes: a tee 2 connected in sequence, a pressure trimmer 3, a stop valve 4, a constant value device 5, a filter reducing Pressure valve 6 and pressure source 7, precision fine-tuning handle 10, fine-tuning handle 11 and pressure relief valve 12 are installed on the pressure trimmer 3, the standard meter 1 and the calibrated meter 8 are respectively connected with the two ports of the tee 2, the standard meter 1 , Calibrated meter 8, tee 2, pressure trimmer 3, stop valve 4, constant value device 5, filter pressure reducing valve 6 and pressure source 7 are connected through connecting pipe 9, which is 4mm in diameter Nylon tube;

[0023] (b), the pressure source 7 provides a rated pre...

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Abstract

The invention provides an accurate method for verifying pressure of a low-pressure instrument. A standard meter and a calibrated meter are connected with a verification device; a pressure source provides rated pressure to a filter reducing valve; the pressure entering the filter reducing valve is reduced to the working pressure required by a setter by adjusting the filter reducing valve; no less than 5 pressure calibration points are selected uniformly in the pressure value range of the calibrated meter, the setter is adjusted to output pressure signals in the increase or decrease direction, and when the pressure value of the standard meter points to each pressure calibration point, a stop valve is turned off; a fine tuning handle, a precise fine tuning handle and a pressure release valveon a pressure fine tuner are adjusted to enable the pressure value of the standard meter to be stabilized on each pressure measurement point, and then, the pressure value of the calibrated meter is observed; and when the intrinsic error and variation of the pressure value of the calibrated meter at each pressure calibration point do not exceed the permissible error required by instrument accuracy,the calibrated meter does not need to be adjusted, or otherwise, the calibrated meter needs to be adjusted.

Description

technical field [0001] The invention relates to a method for calibrating the pressure of a low-pressure instrument, in particular to an accurate method for calibrating the pressure of a low-pressure instrument. Background technique [0002] In the calibration of pressure instruments, the instruments in the low pressure range are generally not easy to calibrate. The main reason is the way of providing pressure. Hand-held pressure pumps are commonly used. During the pressurization process of the hand-held pressure pump, the pressure increase is slow. , the pressure fluctuates greatly, and the pressure is not easy to control during the downstroke pressure relief process. In order to solve these problems, it was decided to study a method to provide pressure quickly, steadily and accurately during the calibration of pressure instruments. Contents of the invention [0003] The purpose of the invention of this application is to solve the problems of slow pressure rise, large pre...

Claims

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Application Information

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IPC IPC(8): G01L25/00G01L27/00
Inventor 刘军张昶
Owner CHINA NAT CHEM ENG THIRD CONSTR
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