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f682aff184 The transit time is defined with the help of radiation detectors placed on the outside of the pipe. This technology is also known as acoustic Doppler velocimetry. Proceedings of San Diego Biomedical Symposium. The vortices trail behind the cylinder, alternatively from each side of the bluff body. Since stray electrical energy flowing through the flow tube can cause inaccurate readings, most mag meters are installed with either grounding rings or grounding electrodes to divert stray electricity away from the electrodes used to measure the flow inside the flow tube. This type of water meter is most often used in residential and small commercial applications and homes. The potential difference is sensed by electrodes aligned perpendicular to the flow and the applied magnetic field. The disk must then "wobble" or nutate about the vertical axis, since the bottom and the top of the disk remain in contact with the mounting chamber. The magnetic flow meter requires a conducting fluid and a nonconducting pipe liner. While relatively new to the American water utility market, ultrasonic meters have been used in commercial applications for many years and are becoming widely accepted due to their advantages over traditional mechanical designs.
There are three type of orifice: concentric, eccentric, and segmental.. In most of the world water meters measure flow in cubic metres (m3) or litres  but in the USA and some other countries water meters are calibrated in cubic feet (ft.3) or US gallons on a mechanical or electronic register. (1971). Helical gear. Inevitably heat effects of welding cause distortions and other effects that prevent tabular data on discharge coefficients with respect to line size, beta ratio and operating Reynolds Numbers from being collected and published. Single jet meter. Experimental methods for engineers. Further reading.