Ultrasonic flowmeter

Ultrasonic flow meters can not only measure the flow of medium with large pipe diameters, but also can be used to measure the medium that is not easy to contact and observe. It solves the problem that many complicated working conditions cannot be measured. Therefore, it is loved by many industrial manufacturers. Liaoning's industry has always developed rapidly. Therefore, various industrial meters, especially ultrasonic flowmeters, are used more. There will be a market when there is demand. There are many manufacturers of ultrasonic flowmeters in Liaoning, and I want to choose a good quality price from the middle. Excellent is not easy, so which manufacturer of ultrasonic flowmeters in Liaoning is better. Then what I want to tell you is that, like other flow meters, when choosing an ultrasonic flowmeter, the manufacturer's strength is naturally a part of it, but more importantly, you have to know whether your working conditions are in line with the use of ultrasonic flowmeters. Then I will tell you what is an ultrasonic flowmeter and some points that should be paid attention to in the selection and installation of the ultrasonic flowmeter.　　Principle: Ultrasonic flowmeter is a meter that measures the flow rate by detecting the effect of fluid flow on the ultrasonic beam (or ultrasonic pulse). According to the principle of signal detection, ultrasonic flowmeters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam shift method, Doppler method, cross correlation method, and spatial filtering method And noise law, etc.　　Type selection: Only the correct selection of ultrasonic flowmeter can ensure the better use of ultrasonic flowmeter. What kind of ultrasonic flowmeter to choose should be determined according to the physical and chemical properties of the fluid medium to be measured, so that the diameter, flow range, lining material, electrode material and output current of the ultrasonic flowmeter can be adapted to the nature of the fluid being measured. And flow measurement requirements.　　1. Precise function inspection 　　Accuracy grade and function Choose the instrument precision grade according to the measurement requirements and use occasions, so that it is economical and cost-effective. For example, for trade settlement, product handover and energy metering, you should choose a higher accuracy level, such as 1.0, 0.5, or higher; for process control, choose different accuracy levels according to the control requirements; some are only It is to check the process flow and do not need to do precise control and measurement. You can choose a lower accuracy level, such as 1.5, 2.5, or even 4.0. At this time, you can choose a cheap plug-in ultrasonic flowmeter.　　2, measurable medium 　　Measuring medium flow rate, meter range and caliber When measuring general medium, the full-scale flow rate of ultrasonic flowmeter can be selected within the range of measuring medium flow rate 0.5-12m/s, and the range is relatively wide. The specification (caliber) of the selected instrument is not necessarily the same as that of the process pipeline. It should be determined within the flow rate range according to whether the measurement flow range is or not, that is, when the flow rate of the pipeline is low and cannot meet the requirements of the flow meter or when the measurement accuracy cannot be guaranteed at this flow rate , It is necessary to reduce the diameter of the meter to increase the flow velocity in the pipe and obtain satisfactory measurement results.　　Classification: 　　●Plug-in ultrasonic flowmeter: installation and maintenance are possible without stopping production. Ceramic sensors are used, and special drilling devices are used for non-stop production and installation. Generally, it is a single channel measurement. In order to improve the measurement accuracy, three channels can be selected.　　●Pipe-segment ultrasonic flowmeter: It is necessary to cut the pipeline for installation, but the production can not be stopped for future maintenance. You can choose a single-channel or three-channel sensor.　　●Clamp-on ultrasonic flowmeter: It can complete fixed and mobile measurement. Use special coupling agent (silicone rubber cured at room temperature or high temperature long-chain polymer grease) to install, and the pipeline will not be damaged during installation.　　●Portable ultrasonic flowmeter: portable use, built-in rechargeable lithium battery, suitable for mobile measurement, equipped with a magnetic sensor. 1. Non-contact measurement method, small size, easy to carry 2. Suitable for on-site measurement of various sizes of pipe sound conducting media 3. Built-in Ni-MH rechargeable battery working time of more than 20 hours 4. Flexible user interface, easy to use 5. Smart -Type on-site printing function to ensure complete flow data 6. Equipped with an integrated aluminum alloy protective box, which can be used in harsh outdoor environments ● Handheld ultrasonic flowmeter: small size, light weight, built-in rechargeable lithium battery, handheld use, with Connect the magnetic sensor.　　● Explosion-proof ultrasonic flowmeter: used for liquid flow measurement in explosive environments, explosion-proof and intrinsically safe. That is, the converter is explosion-proof, and the sensor is intrinsically safe.　　 Know yourself and the enemy, and you will not fail in a hundred battles. Through the principles of ultrasonic flowmeters and some selection and classification points that I have explained for you above, I must have a clear understanding of ultrasonic flowmeters.　

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