Calibration system and method applied to ultrasonic gas meter

Abstract

The invention discloses a calibration system and method applied to an ultrasonic gas meter. According to the calibration system and method, a flow collection module collects gas flow velocity data in a metering pipeline once every t seconds; a data processing module formulates a pulse sending strategy according to the gas flow rate data at the current time and the current gas flow grade, meanwhile, an independent pulse generation module sends pulses to the standard test board according to the pulse sending strategy, and the independent pulse generation module and the data processing module run in parallel; the standard test board calculates and obtains measured flow data based on all pulses received within the calibration measurement time, and the standard test board compares the measured flow data with standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter; an independent pulse generation module and a data processing module are introduced to run in parallel; time consumption can be reduced, loss errors can be avoided, the sampling time interval and the pulse trigger threshold value of the grade are set according to the gas flow grade, and the precision of the calibration system is improved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic gas metering, in particular to a calibration system and method applied to ultrasonic gas meters. Background technique [0002] With the increasingly higher requirements for gas metering accuracy in the field of gas metering, ultrasonic gas meters are emerging. Compared with membrane gas meters, ultrasonic gas meters have the advantages of wide measuring range, small size, simple structure, high measurement accuracy, and good stability; however, ultrasonic gas meters are fully electronic and have no word wheels, so they cannot be tested with sonic nozzles The existing ultrasonic gas meter needs to detect the error when it leaves the factory, but the ultrasonic gas meter is not like the traditional membrane gas meter to adjust the measurement error by changing the mechanical gear, but by setting the correction coefficient to adjust the measurement error. Conventional manual acquisition of correc...

AI Technical Summary

Problems solved by technology

[0004] 1. If the ultrasonic gas meter communicates directly with the test bench through WIFI wireless mode or wired mode, the test bench needs to be refitted. Retrofitting the test bench requires a high cost, and using the wired mode is not applicable in high ground temperature environments

[0005] 2. The communication process of the existing ultrasonic gas meter sampling and test bench takes a long time, and the pulse is easily lost, which affects the judgment accuracy of the test bench

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