Large-caliber ultrasonic flowmeter

The large-diameter ultrasonic flowmeter is a non-contact instrument, which can measure the flow of large-diameter media and can also be used for the measurement of media that are not easy to contact and observe. The measurement accuracy of the large-caliber ultrasonic flowmeter is very high, and it is almost free from the interference of various parameters of the measured medium. It can especially solve the flow measurement of strong corrosive, non-conductive, radioactive and flammable and explosive media that other meters cannot. problem.　　 The correct selection of the large-caliber ultrasonic flowmeter can ensure the better use of the 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.　　The types of ultrasonic flowmeters are divided into the following 　　●Plug-in ultrasonic flowmeters: 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.　　● Handheld ultrasonic flowmeter: small size, light weight, built-in rechargeable lithium battery, handheld use, with 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. What do you need to pay attention to when installing a large-caliber ultrasonic flowmeter? Before installing the ultrasonic flowmeter, you should understand the site conditions, including: 　　1. What is the distance between the sensor and the host; 　　2. Pipe material, pipe wall thickness and pipe diameter ;　　3. Pipeline age; 　　4. Fluid type, whether it contains impurities, bubbles, and whether the pipe is full; 　　5. Fluid temperature; 　　6. Whether there are interference sources (such as frequency conversion, strong magnetic field, etc.) at the installation site; 　　7. Four seasons temperature where the host is placed ;　　8. Is the power supply voltage used stable; 　　9. Is there a need for remote signal and type; 　
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