Precautions for Ultrasonic Flowmeter Installation

1. The influence of the installation environment. During installation, it is generally required that the upstream and downstream of the flowmeter have straight pipe sections of 10 times and 5 times the pipe diameter respectively, so as to ensure that the flow state of the measured medium meets the accuracy requirements of the instrument. During on-site installation and use, it is often not possible to Find an installation location that meets your requirements. Insufficient straight pipe section leads to different measurement errors. The downstream straight pipe has little influence on the accuracy. When the upstream side has more than three times the pipe diameter straight pipe, it can basically meet the use. When the upstream straight pipe section is not enough, such as after elbows, valves, and pump valves When installing a watch, it generally shows a positive error. 2. The influence of pipeline parameter input After the ultrasonic flowmeter is installed, the instrument needs to input parameters such as pipe diameter and pipe wall thickness. If the input parameters are changed when the pipeline is fixed, the error of the pipe diameter input will increase the error of the measurement result. 2 times, the input error of the pipe wall thickness is positively correlated with the measurement error, but the impact on the measurement result is not great. 3. The influence of the inner lining and the pipe material. , causing an error in the incident angle of the ultrasonic wave, reducing the measurement accuracy, and affecting the signal and settings in serious cases, so that the measurement cannot be performed. The influence of the pipeline lining on the measurement is mainly due to the change of the actual pipe diameter. The lining reduces the cross-sectional area of ​​the water, and the flow theory converted by the flow velocity is correspondingly small. The measurement error is proportional to the change of the pipeline cross-sectional area. If the lining is too thick and is neglected during installation or there is a gap with the pipe wall, detection or signal errors will generally occur. Therefore, the lining material and thickness should be accurately input during measurement. The influence of the quality of the pipe and lining on the measurement is reflected in the difference in the propagation speed of sound waves in various media. If the actual sound velocity of the material is greater than the set sound velocity, the measurement result will be too small, otherwise it will be too large. 4. The sensor installation is divided into Z method, V method, X method, etc. according to the measurement environment and the measurement probe. The selection principle of the measurement sensor installation method is: when the water flows in parallel When the direction is not parallel to the pipeline axis or the installation location of the pipeline restricts the installation interval of the transducer, the V method and the X method are used. Without affecting the signal reception, the measurement accuracy of the V method is higher than that of the Z method. There are strict requirements on the distance between the two sensors, and they must be installed according to the specified size. Different installation distances have different effects on the measurement accuracy, and some even have large errors. 5. In the error analysis of other external factors, couplant, signal cable ultrasonic flowmeter’s operating characteristics and the impact on the measurement of the portable ultrasonic flowmeter, it can be seen that in order to ensure the accuracy of flowmeter measurement to the greatest extent, the following must also be paid attention to A few points: the wall surface where the sensor is installed should be polished clean; the installation position of the sensor should be as close as possible to the bending axis plane of the upstream elbow to obtain a closer average value after the smooth distortion of the elbow; the sensor installation and the reflection of the pipe wall must be Avoid joints and welds; the pipeline lining and scale layer where the sensor is installed should not be too thick; couplant must be used.

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