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Parshall flumes user guide eng

CList of Contents Introduction Functions Technichal parameters of the ume Installation Operational conditions Calibration Applications Appendix Certi ?cation ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Warranty ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Contact ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Parshall Flume User Guide V - - C Introduction The Parshall ume is a measuring device of the volume ow rate with a wide variety of use It can be installed in a stream drainage irrigation canal reservoir outlet sewer system waste-water treatment plant etc Its broad applicability is mainly due to these advantages small energy losses - times smaller than in a weirs high insensitivity to velocity distribution pro ?le at the in ow ability to withstand high degrees of submergence up to velocity of ow through the ume is su ?ciently rapid to prevent suspended solids sedimentation minimal maintenance costs long lifetime broad range of ow measurements the deviations is in the range from to for minimum and maximum of ow on the level of probability Functions Water coming into the ume is forced by a bottleneck and by a subsequent bottom dip to pass over a critical depth where it goes from river-speed motion into rapidsspeed motion Thanks to this transition from one regime to another water ow can be measured from the water levels before the neck Water levels are scanned either inside the gauge shaft which is part of the Parshall ume or inside the axis of the in ow part of the ume Inside the shaft levels are gauged by a oat linked by mechanical transmission with a ow meter or by the sensor of an electronic owmeter In the ume axis levels are scanned by an ultrasonic sensor The electronic owmeter converts data about ume water depths to ow rates and volumes Standard Parshall ume is produced without gauge schaft New electronic evaluations units provide data storing statistic data treat and other calculations Data can be sent to internet servers or directly to the computers as well as to the mobile phones Some of the units can control the waste water treatment plant technology or control the valves or chlorine dosage pumps and etc The measuring equipment meets metrological standards of EU The Czech Certi ?cations are acknowledged in the countries which have a contract with The Czech Metrological Institute Parshall Flume User Guide V - - C Technical parameters of the ume The Parshall ume is made of polypropylene Exact dimensions and weights of individual umes which are