Abstract: The performance and use information of ultrasonic
flowmeters are provided to you by excellent flowmeters and flowmeter manufacturers. Abstract: This paper discusses the problems related to the use of ultrasonic flowmeters to measure liquid flow, focuses on the measurement principle, installation, use and calibration of ultrasonic flowmeters, and introduces SERIEST based on the specific situation of Glaxo Wellcome (Suzhou) Pharmaceutical Co., Ltd. . For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the performance and use of ultrasonic flowmeters. The article discusses the problems related to the use of ultrasonic flowmeters to measure liquid flow, and focuses on the measurement principle, installation, use and calibration of ultrasonic flowmeters, and introduces the SERIESTFX series ultrasonic flowmeters in combination with the specific situation of GSK (Suzhou) Pharmaceutical usage of. 1. The question is put forward. Our company has many flow measuring instruments, which measure and control important parameters such as fluid flow and flow rate in the public system process. It is very necessary to have a set of measuring devices that can accurately reflect the actual use of the fluid. Therefore, in order to improve the measurement level and ensure that the measuring instruments can be displayed accurately, after careful analysis and research of each system, combined with the actual situation of our company, we gradually switched from using rotor flowmeters to measuring using ultrasonic flowmeters. The system has been running for 3 years, greatly improving the accuracy of measurement work, and easy installation and use, thus obtaining obvious economic benefits. 2. Principle introduction At present, two types of ultrasonic flowmeters are usually used, one is Doppler ultrasonic flowmeter, and the other is time difference ultrasonic flowmeter. The Doppler type uses the phase difference method to measure the flow velocity, that is, a sound wave of a known frequency moves in the fluid. Because the liquid itself has a moving speed, the frequency or phase of the ultrasonic wave between the two receivers (or transmitters) occurs. Relative change, by measuring this relative change, the liquid velocity can be obtained; the time difference type uses the time difference method to measure the flow velocity, that is, the sound wave of a certain speed due to the fluid flow causes it to travel between two receivers (or transmitters). change, and by measuring this relative change, the fluid flow rate can be obtained. At present, a transit-time ultrasonic flowmeter is used. 3. Introduction of installation method There are usually three installation methods at present: W type, V type, Z type. The installation method is selected according to different pipe diameters and fluid characteristics. Generally, the W type is suitable for small pipe diameters (25~75mm), the V type is suitable for medium pipe diameters (25~250mm), and the Z type is suitable for large pipe diameters (above 250mm). ), in a word, in order to improve the accuracy and sensitivity of the measurement, select the appropriate installation method so that the measurement signal (ie the difference) matches the secondary instrument. Currently I use a Z-mount. In order to ensure the measurement accuracy of the instrument, a location that meets certain conditions should be selected: usually choose a straight pipe section above 10D in the upstream and 5D in the downstream; no disturbance equipment such as pumps and valves can be installed in the upstream 30D. For the Z-type installation of our company, the installation method of the ultrasonic flowmeter probe is briefly discussed."Coordinate method installation", that is, first clean the outer surface of the pipe, apply a special coupling agent, first fix the position of one of the probes, wrap a paper tape around the pipe, measure the perimeter and make a half-fold mark, and determine the other at 1/2 of the perimeter. The position of the probe track, also the track should be parallel to the axis of the pipeline, and then determine the relative distance between the two probes on the track according to the installation distance displayed by the instrument to ensure that the ultrasonic wave has sufficient signal strength. Usually, the signal strength displayed on the panel is greater than 2%, when the reading is stable, it means that the installation and debugging are over, and the instrument can work normally. 4. Use of flowmeter (1) Checking of zero flow When the liquid in the pipeline is still, and there is no strong magnetic field interference or strong vibration around, the meter shows zero, and the zero point is automatically set at this time to eliminate zero point drift. The small signal must be cut off, usually the flow rate is less than 5% of the full-scale flow, and it is automatically cut off. At the same time, the zero point can also be adjusted through the menu. (2) Before starting the operation of the instrument by operating the keyboard on the instrument panel, first set the parameters effectively, such as the unit system, installation method, pipe diameter, pipe wall thickness, pipe material, pipe roughness, fluid type, distance between two probes, Flow rate units, min speed, max speed, etc. Only when all the parameters are input correctly, the meter can correctly display the actual flow value (3) Periodic calibration of the flowmeter In order to ensure the accuracy of the flowmeter, we carry out regular calibration, usually we use a higher-precision portable flowmeter for direct Contrast, use the measured data to calculate: error=(measured value-standard value)/standard value, use the calculated relative error, and correct the coefficient, so that the measurement error satisfies±A 2% error can meet the measurement requirements. The operation is simple and convenient, and can effectively improve the accuracy of measurement. 5. Conclusion Flow is an indicator of energy consumption of an enterprise and one of the important parameters to be detected in the production process of an enterprise. Flow meters have been used more and more. Highly intelligent instruments are very popular. The SERIESTFX ultrasonic flowmeter selected by our company truly reflects the characteristics of convenient installation, reliable measurement and easy operation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Performance and Use of Ultrasonic Flow Meters'
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