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Industry Information
Ultrasonic flowmeters require higher pipelines and must be partially scraped
2012-4-10 8:53:53

是当今世界上具竞争力的流量测量手段,其测量线精度高于1.0%。 Ultrasonic flowmeter is a competitive flow measurement method in the world today, and its measurement line accuracy is higher than 1.0%. Due to the diversity of the industrial site, especially the environment around the pipeline, how to install and debug the ultrasonic flowmeter according to the specific environment has become an important topic in the field of ultrasonic flow measurement. It further fully reflects the advantages of accuracy, reliability and stability of the ultrasonic flowmeter, greatly reducing future maintenance work and even maintenance-free. Ultrasonic flowmeter installation steps: (1) Observe whether the pipeline at the installation site meets the first 10d and 5d after the straight pipe section and the distance from the pump 30d (d is the inner diameter of the pipeline). (2) Confirm the fluid medium in the pipeline and whether it is full. (3) Confirm the pipe material and wall thickness. (4) After the first three steps are completed, you can confirm which sensor is used for installation. (5) After selecting the sensor, start to input parameters to the meter body to determine the installation distance. (6) Measure the installation distance accurately. The outer clip can be optionally installed with the approximate distance of the sensor, and then the active sensor is continuously adjusted to achieve the best match of signal and transmission ratio. Insert and use a special tool to measure the distance between the mounting points on the pipe. This distance is very important. It directly affects the actual measurement accuracy of the meter, so it is best to perform multiple measurements to obtain higher accuracy. Then, make a hole → install the sensor → debug the signal → make waterproof → reorganize the signal cable → clean up the waste such as the on-site wires. The installation of an ultrasonic flowmeter is an excellent flow measurement instrument. The convenience and economy it brings to the measurement of flow are unmatched by other flowmeters. Therefore, the ultrasonic flowmeter should be installed and used correctly according to the requirements of the use conditions and environment of the ultrasonic flowmeter, accurately set the pipeline parameters, and periodically verify or calibrate the ultrasonic flowmeter, so as to ensure the accurate measurement of the ultrasonic flowmeter and extend its service life.

是一种非接触式流量计。 The ultrasonic flowmeter is a non-contact flowmeter. The working principle is that when ultrasonic waves propagate in a fluid, their propagation speed is affected by the flow velocity of the fluid. By measuring the velocity of ultrasonic waves in the fluid, the flow velocity of the fluid can be detected and converted into a flow rate. Taking the most widely used time-of-flight ultrasonic flowmeter as an example, when the ultrasonic wave propagates in a fluid, the ultrasonic wave's propagation speed increases in the forward direction and decreases in the countercurrent direction, that is, the same propagation distance has different propagation times. The relationship between the difference between the propagation velocity and the measured fluid velocity is calculated by calculating the velocity and the flow rate. That is, when the ultrasonic beam propagates between the "upstream sensor" and the "downstream sensor" in the direction of the water medium flow in the pipeline, the flow of water will cause a small change in the propagation time of the ultrasonic beam relative to the static propagation, and this propagation time The change is proportional to the flow rate of water. This is the measurement principle of the time difference ultrasonic flowmeter. The theoretical expression of the relationship is as follows:

V = MD / sin2θ × △ T / TupTdown

In the formula, M—the number of linear propagation of ultrasonic beam in water
θ—the angle between the ultrasonic beam and the direction of water flow
Tup—the propagation time of the ultrasonic beam in the positive direction (the propagation time from the upstream sensor to the downstream sensor)
Tdown—the propagation time of the ultrasonic beam in the reverse direction (the propagation time from the downstream sensor to the upstream sensor)
△ T = Tup—Tdown

产品使用特点1.超声波流量计有对角和反射两种模式,当反射模式测不出时用对角模式可能能测出,以至于后来我们一直用反射模式。 Ultrasonic flowmeter product features 1. Ultrasonic flowmeters have two modes of diagonal and reflection. When the reflection mode cannot be measured, the diagonal mode may be able to measure, so that we have always used the reflection mode. 2. Ultrasonic flowmeters have high requirements for pipelines, and the insulation layer must be scraped off, otherwise it cannot be measured. When we measure the air-conditioning water system, use a knife to cut off the insulation layer to prevent the sensor, and then stick the cut insulation layer after the measurement. The surface of the pipe is as bright as possible. If it is too rough, it must be polished with sandpaper. 3. Ultrasonic flowmeter is difficult to measure when the fluid in the pipeline is not full, so the measurement position should be as straight as possible, away from bends, valves and other places. 4. The authenticity of the ultrasonic flowmeter reading depends on the signal strength. When the signal is too low, the result is basically unreliable, generally it is more than 60% or even more. 5. As the readings may vary greatly, the approach we take is to allow the flowmeter to take continuous readings, such as continuously reading for one minute and then taking the average. 6. It is more difficult to measure hot water pipes than cold water pipes. Because the temperature of the hot-water pipe wall surface is high, the couplant is easily made at high temperatures. In addition to the product's own couplant, we have all tried toothpaste. The accuracy and precision of ultrasonic flowmeters need to be improved