Scale in the sewage flow meter scale ultrasonic flowmeter calibration

Abstract: the scale in the sewage flow meter scale ultrasonic flowmeter calibration the discussion of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 there are two kinds of principle of ultrasonic flowmeter the commonly used ultrasonic flowmeter principle: the time difference method and doppler method. 1. 1 time difference method principle of ultrasonic signal in the fluid, the downstream signal transmission speed, transmission time is short; The upstream signal transmission speed slow, spread. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale in the sewage flow meter scale ultrasonic flowmeter calibration of discussion for details. 1 there are two kinds of principle of ultrasonic flowmeter the commonly used ultrasonic flowmeter principle: the time difference method and doppler method. 1. 1 time difference method principle of ultrasonic signal in the fluid, the downstream signal transmission speed, transmission time is short; Upstream signal transmission speed slow, transmission time is long, the use of ultrasonic signal in the fluid acoustic signal propagation time deposit in the upstream direction in difference, namely the time difference, fluid flow can be calculated. Time difference method is more suitable for measuring the pure liquid, there are more bubbles of the liquid or suspension will hinder the normal pulse propagation, lead to can't normal measurement. 1. 2 principle of doppler method, ultrasonic signal propagation path in tiny suspended matter ( Suspended matter or tiny bubbles) By scattering, ultrasonic receiver to receive after scattering of ultrasonic signal. Emission signal frequency is affected by the doppler effect to different received signal frequency, the difference between the two frequencies have to determine the number of relations with the fluid velocity, the fluid flow can be calculated. Method of doppler flowmeter can't measure the flow of clean body, more than about 50 mg/L can only measure turbidity flow. While doppler measurement accuracy is lower than the jet lag, generally to 2. Level 0, 2% of full scale error ( 2%F. 年代。 ） 。 2 ultrasonic flowmeter using the matters needing attention in recent years, with the ultrasonic flowmeter in the application of sewage flow meter calibration online is becoming more common, flowmeter accuracy is not high question also gradually exposed, specification and the flowmeter in operation are the main reasons why their own problems. 2. 1 non-standard pipeline operation aspect, the technical staff often does not operate according to standard operating procedures, such as accurate measurement of pipe diameter, perimeter, wall thickness, contact temperature and so on, these parameters will be important influence on the original data of ultrasonic flowmeter correction. Installation, technical personnel often do not according to the selection of pipe size and signal intensity installation, often select flowmeter double lift mode by default. Correct installation method is: ChanShengCheng should be adopted in large pipe and complex environment; In the case of small pipe and the signal strong selection path. Installation location, technicians are often placed at random ultrasonic probe, and do not confirm whether the sewage pipe with pipe is an important measurement conditions. The correct installation position is: should choose the level of the pipeline middle place the probe; Only under the condition of pipe with pipe can accurately measure, the fluid to the upper vertical pipe can ensure full pipe flow. In addition, the scene of the pipe lining thickness and type of important parameters, such as it is often difficult to obtain, which seriously affected the accuracy of the meter. 2. 2 ultrasonic flowmeter itself problem is first time difference method and doppler method, the selection of flow meter. Time difference method is suitable for the pure liquid flow meter, computation, accuracy is better than & plusmn; 1. 0%; The doppler method flowmeter is suitable for turbidity flow volume of more than 50 mg/L. Therefore, two kinds of principle of flow meter is very important in the selection of sewage flow meter calibration when. Under normal circumstances, the sewage in the pipe is clean, can choose the time difference method; When water is turbid, should choose the doppler method. But dirty water clean and turbidity in the scene is very difficult to be quantitatively defined, so choose these two have no general method to follow the principle of the flowmeter, lead to inaccurate measurement meter itself, let alone the calibration of sewage flow meter. Second ultrasonic receiving also flawed. Ultrasonic because it is through the transmitting and receiving of ultrasonic signal in the pipe fluid flow is measured, so the piping material of ultrasonic reflection, fluid of impurities of ultrasonic reflection and scatter shot, fluid random of bubbles and the content of impurities in high and low will be unstable influence on measurement. Oilfield sewage contains a lot of crude oil, gravel, bubbles, chemicals, etc. , the pipe environment is very complex and changeable, the serious influence the accuracy of the measurement. In view of the ultrasonic flowmeter in the sewage flow meter calibration online accuracy is not high. In nearly a year of time, the use of 26 certified reference meter sewage flowmeter, has carried on the scene to 4 sets of ultrasonic flow meter calibration online, through a lot of experiments and data analysis, discuss the role of ultrasonic flowmeter in the sewage flow meter calibration.

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