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Instrumentation
Published in Ralph L. Stephenson, James B. Blackburn, The Industrial Wastewater Systems Handbook, 2018
Ralph L. Stephenson, James B. Blackburn
The magnetic flow meter as shown in Figure 12.10, utilizes the electromagnetic principle that any fixed dimension conductor, be it a bar of steel or a column of water passing through the lines of force of a magnetic field, will generate an electromotive force (voltage) directly proportional to the rate at which the conductor is passing through the field. This is the same principal used to make electric motors rotate and the production of power by generators. In the case of the magnetic flow meter a magnetic field is generated by a coil placed around a piece of pipe. Electrodes are mounted in the pipe to measure the small amount of current generated by the fluid passing through the magnetic field. This current is then electronically converted to a signal proportional to flow.
Magnetic Flowmeters
Published in Béla G. Lipták, Flow Measurement, 2020
The conservative installation of magnetic flowmeters requires 3 to 5 diameters of straight pipe, the same size as the flowmeter, to be installed upstream to the meter, and 2 or 3 diameters downstream. Meters can be installed in horizontal pipelines, vertical pipelines, or sloping lines. It is essential to keep the electrodes in the horizontal plane to assure uninterrupted contact with the liquid or slurry being metered. In gravity feed systems, the meter must be kept continually full; therefore, the meter should be installed in a “low point’” in horizontal lines (Figure 9p) or, preferably, in a vertical upflow line.
The Paradigm Case Method of Selecting Flowmeters
Published in Jesse Yoder, New-Technology Flowmeters, 2023
The paradigm case application for magmeters involves conductive fluids flowing through a full pipe that do not contain materials that damage the liner or coat the electrodes. The most obvious and serious limitation on the use of magnetic flowmeters is that they only work with conductive fluids. This principle works with conductive liquids but not with gases or steam, so magmeters only work with conductive liquids. Because they compute flowrate based on velocity times area, accurate readings require that the pipe be full. In addition, electrode coating and liner damage can degrade the accuracy of magnetic flowmeters.
Numerical and experimental analysis on the non-uniform inflow characteristics of a reactor coolant pump with a steam generator channel head
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Wang Yuehui, Xu Zhongbin, Wang Pengfei, Wang Jiaming, Ruan Xiaodong
The axial velocity profile of the section during normal flow (1.0Q) was then measured. According to the design, eight measuring points were evenly arranged on the cross-section. The flow rate was adjusted to a predetermined value by controlling the opening of the throttle valve. After the flow field had stabilized, the flow rate was measured by the pitot tube, which has an uncertainty of less than ±0.5%. The flow rate was measured using a magnetic flow meter with an uncertainty of less than ±0.5%. The pressure sensor was used to measure the pressure at the inlet and outlet of the test pump, and the uncertainty was within ±0.1%. The axial velocity distribution at different radii (0.15R, 0.45R and 0.70R) at the standard flow rate (1.0Q) was measured at the same section. The measured position was twice the diameter of impeller inlet diameter (2D) from the bottom of the SG. Figure 6 shows a clear distortion of the velocity of the flow field at the inlet cross-section. This proved that the complicated structure of the SGCH led to distorted inflow and an obvious low-velocity zone formed at the inlet cross-section. With increasing radii, the axial velocity value increased and the velocity distortion became more evident.
Enhancing flow pattern upstream of New Hafeer Pump Station
Published in Water Science, 2018
The model was constructed over a large underground reservoir to feed and drain the system (recirculated feeding system). Its capacity was sufficient to feed the model with flows higher than maximum required discharge. An electric centrifugal pump of 10 in. diameter pipeline with capacity of 150 l/s was utilized. An Electro-Magnetic Flow meter was placed over the pipeline to measure the flow rate with ±1% accuracy.