Design and Application of Gas Flowmeter On-line Calibration System

Considering the high-cost of off-line calibration for gas flowmeter and the high accuracy and stability of ultrasonic flowmeter,a set of on-line calibration standard device for gas flowmeter was developed based on the working principle of time-difference ultrasonic flowmeter. Experiments proved that it can realize data acquisition,display and data processing of the standard ultrasonic flowmeter and checked flowmeter,and analyzed the factors which influence the accuracy of detection. It provides an effective protection for the measurement and quantity traceability of gas flowmeter.