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1UDF-360 Digital Ultrasonic Flowmeter Features UDF-360 digital ultrasonic flowmeter is based on microprocessor technology, its own complete flow measurement instrument, compared with other conventional type flowmeter or other ultrasonic flowmeter, with high precision, In addition to the remarkable features of high reliability, high performance, and low price, it also has a bilingual window operation in both English and Chinese, positive and negative net accumulators, RS-232 interface, perfect communication networking protocol, and built-in traffic sun, moon and year accumulator. , built-in power off recorder, built-in data recording and other advantages.
2UDF-360 digital ultrasonic flow meter working principle 
3 UDF-360 Digital Ultrasonic Flowmeter Installation and Implementation Method 3.1 Selecting the Measurement Point The ultrasonic flowmeter is installed by selecting a suitable measurement point, inputting the piping parameters at the measuring point into the flowmeter, and then binding the probe on the pipeline. can. In order to ensure the measurement accuracy, when choosing the measuring point, it is required to select the uniform part of the fluid flow field. Generally, the following principles should be followed: Select the fluid-filled pipe section, such as the vertical part of the pipe (the fluid is best to flow upwards) or be filled with the fluid level. Pipe section. The measuring point should be 10 times the diameter of the upstream and 5 times the diameter of the downstream straight pipe. There is no interference flow field device such as any valve, elbow and adjustable diameter. Make sure that the temperature at the measuring point is within the working range. Consider the condition of fouling on the inner wall of the pipe, and try to select the section without scale to measure. When it cannot be satisfied, scaling should be considered as a lining for better measurement accuracy. Select pipe sections that are uniform and dense and easy to transmit ultrasonic waves. The measurement point selection is shown in Figure 2. 
Before installing the probe, select the dense part of the pipe to install the probe. The area outside the pipe where the probe is to be installed should be cleaned and all rust stains should be removed. It is best to use the angle grinder to polish the light and expose the original color. Then use a clean cloth to dip the acetone. Or alcohol to wipe off oil and dust, and then apply enough couplant in the central part of the probe and the wall of the tube, then affix the probe tightly to the wall of the tube. (If no clear signal is collected, two probes should be installed in the horizontal direction of the pipe shaft)
The probe installation method often uses two methods. The two methods are V method and Z method. The following are separately explained. Generally when small diameter (DN15 ~ 200mm) can be selected first V method; V method can not measure the signal or signal quality is poor when the choice of Z method, the pipe diameter above DN200mm or cast iron pipe measurement method is preferred Z.
3.2.1V method (common method)
The V method is a standard installation method under normal circumstances. It is easy to use and measures accurately. The range of measurable pipe diameters is from 15mm to approximately 400mm. When installing the probe, pay attention to the horizontal alignment of the two probes, with the centerline horizontal to the pipe axis. (See Figure 3) 
When the pipeline is very thick or because there is suspended matter in the liquid, the inner wall of the pipe is too thick or the lining is too thick, which causes the weak signal of the V method to be installed and the machine cannot work normally, the Z method must be adopted for installation. The reason is that when using the Z method, ultrasonic waves are transmitted directly in the pipe, there is no refraction (called a single sound path), and signal loss is small.
The Z method can measure pipe diameters from 100mm to 6000mm. When the flow meter is actually installed, the Z method is selected for pipes over 200 mm (the signal thus measured is the largest). (See Figure 4) 
5 Conclusion As the reservoir for the first time digital ultrasonic flow meter applied to the measurement of industrial water supply, fill the blank of the water supply facilities in the reservoir, provide accurate and detailed basis for reservoir water supply management, bring a certain economic benefits to the reservoir
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Wowo Reservoir is located on the main stream of the Taizi River in Liaoyang, Liaoning Province. The drainage area above the dam site is 6,175 km2, and annual runoff is 2.45 billion m3. It is a large-scale (II) type water conservancy project that focuses on flood control, taking into account the agricultural irrigation, industrial water supply, and the combined use of water for power generation. The effective irrigation area is 813 million m3, the average annual agricultural water supply is 650 million m3/year, and the industrial water supply is 0.5 billion m3/year. In 2007, in order to further promote standardization management, strengthen water supply measurement management, rationally use water resources, and effectively save energy, the reservoir introduced an advanced digital ultrasonic flowmeter (UDF-360), which is the first time the reservoir will be digital Ultrasonic flowmeters are used for metering management of reservoir water supply and have received very good results. Where θ is the angle between the sound beam and the direction of flow of the liquid M is the number of straight propagation of the sound beam in the liquid D is the inner diameter of the pipe Tup is the propagation time of the sound beam in the positive direction Tdown is the propagation time of the sound beam in the reverse direction ΔT= Tup-Tdown
figure 1
When the ultrasonic beam propagates in the liquid, the flow of the liquid will cause a slight change in the propagation time, and the change in the propagation time is proportional to the flow rate of the liquid, and the relationship is in accordance with the following expression: Figure 2 Probe Mounting Points
3.2 Probe wiring, installation probe connection using high-frequency twisted pair, the advantages of using high-frequency twisted pair signal loss is small, good anti-interference, anti-jamming performance greatly improved. If single-shielded conventional high-frequency cables are used, the performance of the machine will be degraded. When the outside interference signals are large, normal measurements cannot be made. Figure 3V installation diagram
3.2.2 Z method (the most commonly used method) Figure 4 Z installation diagram
4 Issues needing attention in the process of installation and operation In order to accurately measure the amount of water, a portable flow meter is used to measure the selected measurement point before installation, and the measured data is used to further determine whether the measurement point is selected properly and to pay attention to the large distance. Power of electromechanical equipment. After installation, inspections should also be carried out from time to time at the installation site. The main point is to see if the probe is loosely displaced. At the same time, look at the changes at the installation site and whether or not there is an increase in high-power electromechanical equipment causing magnetic field interference.