External clamp type ultrasonic flowmeter|External clamp type ultrasonic flowmeter

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1. What are the installation methods for external clamp type flow meters? Installation regulations for external clamp type ultrasonic flow meters: There are four main installation methods for external clamp type flow meters: V-method installation: the standard installation method is easy to use, accurate in measurement, and suitable for DN15200mm pipelines. Z-method installation: suitable for situations where the pipeline is thick or there are suspended solids in the liquid, and the scale on the inner wall of the pipeline is too thick. It is generally recommended to choose pipelines with a diameter of 200mm or more. N-method installation: By extending the ultrasonic transmission distance to improve measurement accuracy, it is suitable for measuring small diameter pipelines and is generally suitable for the installation of fine pipelines with a diameter of DN50mm or less. W-method installation: It also improves the accuracy of small pipe diameter measurement by extending the ultrasonic transmission distance, allowing the ultrasonic beam to reflect three times inside the pipe and pass through the fluid four times. It is suitable for measuring small pipe diameters below 50mm. The installation and maintenance procedures for external clamping ultrasonic flow meters are as follows: understand the on-site situation, including the distance between the installation site and the host, pipeline material, pipe wall thickness, pipe diameter, pipeline age, fluid type, etc. Choose installation location: The selected pipe section should avoid interference and eddy currents to ensure that the fluid fills the pipeline during measurement. Determine the installation method of the probe: choose the appropriate installation method based on factors such as pipe diameter size and installation conditions. Surface treatment of pipeline: within ± 100mm of the installation point, polish the pipeline to a bright, smooth and free of corrosion pits. Wiring: Connect the probe to the instrument, fix the probe with silicone and clamps after wiring, observe the signal strength, quality, and transmission time of the instrument, and adjust the probe position slightly. Fixed probe: Use a fixture to fix the probe, then seal the surrounding area of the probe in contact with the pipeline with silicone, and wait for the adhesive to solidify. During the installation process, the following points should also be noted: the surface of the metal pipeline where the transducer is to be installed must be polished three times the probe area, rust and paint must be removed, and the pipe wall surface must be smooth and flat. The signal shielding wire of the transducer can be suspended, but cannot be short circuited with the positive and negative terminals. The contact part between the transducer and the pipeline should be sealed with coupling agent to prevent air, dust, and rust from entering. The fixture should be fixed at the center of the transducer to prevent it from sliding easily.

2. The difference between radar flowmeter and ultrasonic flowmeter

Although radar flowmeter and ultrasonic flowmeter are both flow measurement devices, there are significant differences in their working principles, technical parameters, applicable scenarios, installation and maintenance, and selection logic, as follows:

1. The essential difference in working principles. Radar flowmeter is based on microwave radar technology, which detects the surface velocity of water flow through

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