Ultrasonic flow meter scale applications in large diameter

Abstract: the application of ultrasonic flow meter scale in large diameter information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 the characteristics of large diameter water pipe measurement due to the circulating water pipe size is larger, traffic is very big also, a slight deviation in the operation of the instrument, there would be a very big measurement error. To make it to get accurate traffic data, need in the process of measurement meet the following requirements. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the application of ultrasonic flow meter scale in large diameter article details. 1 the characteristics of large diameter water pipe measurement due to the circulating water pipe size is larger, traffic is very big also, a slight deviation in the operation of the instrument, there would be a very big measurement error. To get the accurate traffic data, need in the process of measurement meet the following requirements: (1) the pressure loss is small. Due to the energy loss is proportional to the loss of pressure and flow rate of the product, if the pressure loss is too big, can make the fluid kinetic energy loss in case of flow meter long running huge, cause energy waste. For the large diameter pipe precise metering, need to be in the process of measuring the pressure loss is small enough. (2) can realize on-line maintenance. Because of large diameter pipe installation place is wet and it is not easy to stop maintenance, it is very difficult to furnish flowmeter and bypass arrangements, even if equipped with a bypass valve, opening and closing is difficult, and hard to ensure that the valve tightly, so choose the measuring instrument should be small amount of maintenance and convenient for maintenance. (3) in the medium of sundry small effects. For circulating water piping within the medium contains more impurities, pipeline Canon often contain dirt, grease, sundry etc, should be paid attention to mechanical strength and the impurities of the measuring element of pollution in the water, winding, coverage, and other issues. So should choose no moving mechanical parts or sensor is not easily affected by the measuring instrument. (4) can realize on-line calibration. Calibration when big pipe diameter, flow is big, there are a lot of trouble and difficulties, therefore can only be in the operation of the on-line calibration. 2 other type flowmeter application problems existing in the circulating water meters large caliber to roughly the following several kinds: ultrasonic flowmeter, electromagnetic flowmeter, vortex flowmeter, differential pressure flowmeter, etc. , all kinds of flowmeter major problems are as follows. 2. Electromagnetic flowmeter is 1 electromagnetic flowmeter using the electromagnetic induction principle to determinate the catheter in the conductive liquid average flow velocity, further calculate volume flow of liquid. It has the merits of small pressure loss, and not be measured, such as temperature, pressure, viscosity of liquid, can be measured with impurity liquid, wide range, large caliber, responsive, straight pipe before and after the request is not high, corrosion resistance, long life and other significant advantages, therefore, widely used in circulating water metering. But still there are some problems in the practical work: (1) measurement error affected by external electromagnetic fields. So when installation should pay special attention to avoid violent vibration and ac/dc magnetic field. (2) affected by the velocity distribution in flow velocity under the condition of axial symmetry distribution, traffic signal is proportional to the average flow velocity, because of the influence of velocity distribution and vortex flow meter straight pipe upstream due and certain length, generally preferable 5 d. (3) electrode surface easy to pollution. In measuring adhesion sediment flow, the pollution on the electrode surface, often cause zero drift, so in use, attention should be given to the regular cleaning of the electrodes. 2. Vortex flowmeter is the use of vortex flowmeter are 2 & other; Karman vortex street & throughout; The principle of flow measurement. By the vortex flow sensor and the flow of display instrument. Table inside have no moving parts, simple structure, long service life. Wide range of linear measurement for 30:1. In a certain range of Reynolds number of vortex frequency only associated with liquid flow rate, almost from the measured liquid parameters ( Such as temperature, pressure, density, composition and viscosity, etc. ) The influence of the change. Instrument output frequency signal, easy to implement digital measurement and the advantages of the combination, with the computer application in small diameter circulating water more, big diameter on the application is less, reasons are as follows: (1) spiral body vulnerable to pollution. Vortex flowmeter is suitable for measuring the water purification, water and other impurities less fluid, under the condition of the medium is smudgy, spiral body easy to fouling by water containing other impurities, even produce false signals, influence the normal measurement. (2) are greatly influenced by pipeline vibration. Pipeline vibration is likely to lead to larger error of measurement, the measurement results and the actual serious deviation. When installation should be in line with support, to prevent vibration interference. Straight pipe (3) the demand is higher. Straight pipe required for the former after 20 d, 5 d. Under the condition of low velocity of flow, measuring the deflection. Generally in 0. Below 4 m/s, can't accurate measurement. (4) overall demolition calibration problem, maintenance difficulties and other issues, there is no guarantee that the integrity of the data. 2. 3 according to the fluid flowing through the throttling orifice meter orifice flowmeter pieces produced by the pressure difference and relationship between flow to measure the rate of flow of fluid. With simple structure and no moving parts, high reliability, good retrieval performance, wide adaptability, can be applied to reduce the amount of runoff measurement, etc. In the actual application process for many years, often appear transducer zero drift and phenomenon of pressure pipe is smudgy medium jam, concrete analysis is as follows: (1) strict installation accuracy. Despite general installation specifications to be able to master, but some details tend not to be taken seriously, result in large measurement error.

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