Ultrasonic flowmeter measurement inaccurate how to solve?

Ultrasonic flowmeter is a commonly used in the field of natural gas measurement meters. The flowmeter metering accuracy requirement is very high, if there are inaccurate measurement of how to solve? 1, gas impurity gas flows through the ultrasonic wave flow time, the water, the impurities such as iron sulfide powder gradually accumulated in the pipe or ultrasonic flow meter table body leaned his head, will influence the accuracy of ultrasonic flowmeter, attached to the impurity on the surface of the ultra sonic probe shortens the ultrasonic wave in the pipe, the lost time, influence the sensitivity of the ultrasonic probe, at the same time because of the noise properties of adhesion, pry straight pipe upstream of the surface roughness measuring changes or rectifier board blockage caused by gas flow changes, which affects the accuracy and stability of the flow meter. 2, natural gas in gas transmission station noise due to the air flow speed, elbow, and other kinds of choke valve door fittings, will produce a certain amount of noise, the metering device has full consideration when design and installation. But the scene because of the change of working conditions, such as flow, pressure and temperature, the compressor noise vibration under different power cannot foresee all kinds of factors such as noise still makes ultrasonic flowmeter is affected by the noise in the process of field use. Ultrasonic flowmeter in step-down yuan thing especially sensitive to noise, and even some low noise than the adjustable pressure valve valve for ultrasonic flowmeter, the impact of this is because adopting the technique of low noise valve adjust frequency noise is not sensitive to the human ear hearing of high frequency range ( 20 kHz) Above, the frequency range good diet and ultrasonic frequency, ultrasonic flowmeter larger effects on the ultrasonic flow meter. 3 according to the working principle of ultrasonic flowmeter, pressure and temperature, pressure and temperature measure whether accurate standard condition has a close relationship with flow calculations are accurate. Although in real applications, the pressure transmitter can use the nameplate of the normal work of the working temperature range, but exposed outdoor environment pressure force measured value and the protection of pressure transmitter measured value of the difference can be as high as 18 ~ 20 kpa. Temperature transmitter will appear in the field should be used to protect casing in metal impurities, such as sand like now, unable to reach thermal equilibrium with the gas temperature measuring element, causing the measured temperature is low, large measurement results.

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