Advantages of ultrasonic heat meter and precautions for installation and use

1 Ultrasonic heat meter working principle Ultrasonic heat meter is a meter that measures the flow in the pipeline and the heat exchange system to absorb or release heat by means of ultrasonic ray. When the ultrasonic wave propagates in the fluid, the flow of the fluid will cause a time difference in the propagation speed of the ultrasonic signal, and the magnitude of the time difference is proportional to the flow velocity of the fluid, and then the flow rate is calculated. At the same time, a pair of temperature sensors are respectively installed on the upstream pipe and the down pipe passing through the heat transfer fluid, and the signals from the flow rate and temperature sensors are collected by the integrated calculator, and finally the heat obtained by the heat exchange system is calculated by the integral formula. 2 Advantages of ultrasonic heat meter (1) High measurement accuracy. (2) The measuring mechanism has no moving parts and will never wear. (3) Horizontal, vertical, and inclined installation. (4) The pressure loss is extremely small. (5) The diameter of the measuring tube and the upstream and downstream tubes are exactly the same, so that the water flow is unblocked. 3 Ultrasonic heat meter installation and use precautions 3. 1 Impact of installation environment When installing, it is generally required to have straight pipe sections with 10 times and 5 times diameters upstream and downstream of the flowmeter to ensure that the flow state of the measured medium meets the instrument. Accuracy requirements, when installed on site, often can not find the installation location that meets the requirements. Insufficient straight pipe section leads to different measurement errors. The downstream straight pipe section has less influence on the accuracy. When the upstream side has more than three times of straight pipe diameter, it can basically meet the use. When the upstream straight pipe section is not enough, such as after the elbow, valve and pump valve When the table is expressed, it generally shows a positive error. 3. 2 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. When the pipe is fixed, the input parameters are changed, the pipe diameter input error, and the error of the measurement result will be 2 times enlargement, the wall thickness input error is positively correlated with the measurement error, but the influence on the measurement result is not very large. 3. 3 Influence of the inner liner and the pipe material When measuring the pipe material into the liner input error, the probe installation distance will also be caused. Computational errors cause errors in the angle of incidence of the ultrasonic waves, reducing the accuracy of the measurement, and affecting the signal and settings in severe cases, making it impossible to measure. 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. The flow rate converted by the flow rate is correspondingly small, and the measurement error is proportional to the change of the cross-sectional area of ​​the pipe. When the lining is thick and the setting is neglected or there is a gap with the pipe wall, the detection or signal error generally occurs. Therefore, the lining material and thickness should be accurately input according to the actual measurement. The influence of pipeline and lining on the measurement is reflected in the difference of 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 is small, otherwise it is too large. 3. 4 Sensor installation According to different measurement environment and measuring probe, it is divided into Z method, V method, X method, etc. The selection principle of measuring sensor installation method is: When water flows in parallel along the tube axis, choose Z method to install; When the flow direction is not parallel to the pipeline axis or the installation location of the pipeline limits the installation interval of the transducer, the V method and the X method are used to measure the accuracy of the V method without affecting the signal reception.

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