Abstract: The information on purchasing skills of ultrasonic open channel
flowmeters is provided by excellent flowmeter and flowmeter manufacturers. According to the flow measurement characteristics of urban water supply diversion channels, industrial water diversion and drainage channels, and sewage treatment channels, the following factors should be considered to select an appropriate measurement method. 1) The size and shape of the waterway, the range of flow velocity, the maximum flow and the minimum flow; 2) The measurement accuracy. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on purchasing skills of ultrasonic open channel flowmeters. According to the flow measurement characteristics of urban water supply diversion channels, industrial water diversion and drainage channels, and sewage treatment channels, the following factors should be considered to select an appropriate measurement method. 1) The size and shape of the waterway, the range of flow velocity, the maximum flow rate and the minimum flow rate; 2) The measurement accuracy requirements; 3) The flowmeter installation location and environmental conditions; 4) Liquid condition, cleanliness, containing solid phase concentration, corrosiveness; ) The allowable drop (or raised water level) and the slope of the channel on site; 6) The material of the instrument parts that are in contact with the liquid; 7) When the
ultrasonic flowmeter and the electromagnetic flowmeter are selected, the liquid turbidity or conductivity should be investigated respectively, and the requirements may be Refer to ultrasonic flowmeter and electromagnetic flowmeter requirements. Estimating the channel flow and raising the water level For new units, the channel flow and the proposed installation location can be calculated through the technological process, and then the instrument specifications can be selected. For old enterprises to add meters, it is necessary to estimate the existing channel flow and confirm that the upstream water level of the meter is allowed to rise; that is, to determine the specification and flow range of the flow meter, it depends on two factors, the peak flow of the channel and the allowable elevated water level. (1) Estimating peak flow There are usually two methods: the float method and the daily emission estimation method. 1) Throwing float method The existing open channel can use the throwing float method to measure and estimate the flow. When the maximum flow rate is selected, two people stand beside the straight channel at a distance of L (20~50m), one person upstream puts the float (usually a wooden disc), and one person downstream starts the timer at the moment when the wood chip is put in, and stops when the float arrives. Timing, time t is obtained, and the surface velocity of the channel is obtainedυ m/s(υ=L/t) . After measuring the channel flow cross-sectional area Am2, the flow rate Q can be estimated from formula (5). The daily emission Qd is used to estimate the peak flow Qp. If there is no condition to use the float method or a new system, the actual (or designed) emission can be used to estimate the peak flow. The estimation formula is as shown in Equation (6) or (7). ---- Non-uniformity coefficient, if it is uniform and continuous discharge, it can be taken as 1.1~1.2; H ------- The cumulative number of hours of concentrated discharge per day, if it is non-uniform and continuous discharge, it will be calculated according to the hours of concentrated discharge. (2) Determine the raised water level Except for the flow rate-water level flowmeter and the non-full-pipe electromagnetic flowmeter, the upstream water level should be raised after the flowmeter is installed in the channel. For the newly designed canal system, the height of the raised water level can be determined in full consideration of the measured flow range and the surrounding environmental conditions. When selecting a flowmeter for an existing channel, the influence of the raised water level in the upstream canal system (such as whether the water level will overflow the channel) should be considered, and then the meter specification should be selected according to the determined water level elevation and peak flow value. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Shopping Skills for Ultrasonic Open Channel Flow Meters'
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