Volume correcting instrument indication error calibration standard device and using method

Abstract

The invention discloses a volume correcting instrument indication error calibration standard device and a using method. The volume correcting instrument indication error calibration standard device includes an intelligent flow meter, a thermostat and a temperature standard device, a pressure standard device, a standard frequency generator and a computer, wherein a temperature sensor and a fan are mounted in the thermostat, a blind plate with a temperature testing hole and a blind plate with a pressure testing hole are arranged on a thermostat bottom support, and a flow basic meter is connected between the two blind plates; the temperature sensor and the pressure sensor as well as the temperature standard device and the pressure standard device of the volume correcting instrument are under the temperature and pressure of the same medium in the flow basic meter; and the volume correcting instrument is connected with the standard frequency generator through a conducting wire. If the gas components and pulse equivalent are provided, and under the condition that the temperature and pressure are set, the working condition flow pulse signal is input into the volume correcting instrument to obtain the display value of the accumulated flow rate under the standard condition, and then the indication error is obtained by comparing with the theoretical value under the same working condition according to the international algorithm through the computer. The volume correcting instrument indication error calibration standard device and the using method enable the calibration to be easy to carry out, and reduce the uncertainty of the calibration results.

Description

technical field [0001] The present invention relates to a measurement standard device and using method of a fluid measuring instrument, in particular to a volume correction instrument indication error calibration standard device for calibrating the cumulative volume flow indication error under the standard reference condition of a natural gas volume correction instrument by using a comparison method and how to use it. Background technique [0002] The volume corrector is installed on the flow base meter, equipped with a temperature sensor and a pressure sensor, and receives the pulse signal from the flow base meter, and calculates the cumulative volume flow rate under the standard reference condition (referred to as standard condition cumulative flow rate) with a certain mathematical model. , and a device for displaying, storing and transmitting flow data. The temperature sensor of the volume corrector, the pressure sensor of the volume corrector, the volume corrector and t...

AI Technical Summary

Problems solved by technology

The domestic volume corrector can also be calibrated by division method, but there are no national regulations, norms and standards for the calibration of the domestic volume corrector, and the temperature and pressure sensors of the domestic volume corrector are just built in the flow base meter. It is difficult to disassemble, making the existing foreign calibration methods not applicable to the domestic volume corrector

[0005] Although the division method can calibrate the volume corrector, it is cumbersome

This tediousness also increases the factors that affect the uncertainty in the calibration process, resulting in a large uncertainty in the calibration results.

In addition, the divisional method calibrates the temperature indication error and the pressure indication error in different time and segment, so it is impossible to detect the influence of the pressure sensor measurement performance on the pressure indication error due to temperature drift.

In addition, domestic volume correctors are difficult to disassemble and lack of calibration standards. The verification / calibration of gas flowmeters is mainly aimed at flow base meters, and the measurement accuracy of volume correctors responsible for temperature, pressure, and compression factor corrections is very low. focus on

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