Fixed ultrasonic flowmeter

Speaking of fixed ultrasonic flowmeters, I believe everyone has heard of it. It can be seen in many industrial occasions, so how much do you know about ultrasonic flowmeters? Do you have a deep understanding of its measurement principles, measurement characteristics and related precautions? The editor introduces some related knowledge of fixed ultrasonic flowmeter.　　According to the method of ultrasonic non-contact measurement, when the ultrasonic wave propagates in the flowing fluid, it carries the information of the fluid velocity. Therefore, the flow rate of the fluid can be detected by the received ultrasonic wave and converted into a flow rate. It is precisely because of the unique non-contact measurement method of ultrasonic flowmeter that it is widely used in the flow measurement of industrial pipeline fluid, and it is widely used in environmental protection, petrochemical, metallurgy, papermaking, food, pharmaceutical and other industries.　　 When choosing an ultrasonic flowmeter, the main aspects that need to be paid attention to are the relevant parameters of the product. For example, the measured fluid characteristics, the type of medium, whether it contains impurities, the ambient temperature, the diameter of the pipe, the material, etc., these are all places that need to be confirmed. In fact, the installation method is also a very important part of the technical selection. Here are some things that need to be paid attention to in the installation and selection process: 　　 1. The measurement pipeline is relatively old working conditions, try not to use 2 sound layers (V method) To install the sensor, you should choose 1 acoustic layer (Z method). This installation method can easily receive the ultrasonic wave emitted by the flow sensor of the ultrasonic flowmeter, and the signal of the ultrasonic flowmeter host The strength is guaranteed, and high-precision measurement values u200bu200bcan be guaranteed. 2. When measuring new pipelines, when encountering painted or galvanized pipelines, you can use roving to process the surface of the pipeline first, and then use fine yarn to continue processing, so as to ensure that the installation point of the flow sensor of the ultrasonic flowmeter is smooth and flat. The flow probe of the flow meter can be in good contact with the outer wall of the measured pipe.　　3. When the pipeline runs vertically upwards, if the fluid in the pipeline flows from bottom to top, it can be measured. If the liquid flows from top to bottom, this pipeline is not suitable for flow data collection.　　4. In addition, before collecting flow data for a certain pipeline, you must measure the outer circumference of the pipeline (using a tape measure), wall thickness (using a thickness gauge), and the temperature of the outer wall of the pipeline (surface temperature measuring instrument).　　 5. Remove the insulation layer and protective layer in the installation section, and polish the wall surface where the transducer is installed. Avoid local dents, smooth out the protrusions, and polish the paint rust layer.　　6. u200bu200bFor the vertical pipeline, if it is a mono-channel propagation time method instrument, the installation position of the sensor should be as far as possible in the bending axis plane of the upstream elbow to obtain a closer average value after the elbow flow field is distorted.　　7. The sensor installation location and pipe wall reflection of the ultrasonic flowmeter must avoid interfaces and welds.　　 8. The pipe lining and scale layer of the ultrasonic flowmeter's sensing gala installation place should not be too thick. There should be no gaps between the lining, rust layer and the pipe wall. For severely corroded pipes, a hand hammer can be used to shake the pipe wall to shake off the rust layer on the wall and ensure the normal propagation of sound waves. But care must be taken to prevent the pits from being knocked out.　　9. There is enough couplant between the working surface of the sensor and the pipe wall, and there should be no air and solid particles to ensure good coupling.　　In the selection and installation process, as long as everyone can pay attention to the above points, basically there will be no big problems. Of course, in addition, there will be some particularly complicated working conditions. This requires more professional engineers to solve on-site problems for everyone. Kaidi Sensing Technology Co., Ltd. is a professional automation instrument manufacturer. The internal professional engineers provide free technical services for everyone 24 hours. If you are in the selection or installation process If you have any questions, you can ask him for help.

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