The choice of SUNCENT multi-channel ultrasonic flowmeter mainly depends on the following characteristics of flowmeter:
1. Higher measurement accuracy
Compared with other velocity-type flowmeters, the two-channel ultrasonic flowmeter is less sensitive to upstream obstacles such as elbow, pump or valve, and the reliability of measurement results is high. Even if one channel stops working for some reason, the flowmeter can continue to measure. Typical requirements for straight inlet pipe sections are at least 5D upstream and 2D downstream. On the premise of meeting the above installation requirements, the measurement accuracy of multi-channel ultrasonic flowmeter can reach 0.5%. Compared with this precision, the repeatability of electromagnetic flowmeter is 1/3 of this precision, and the repeatability of ultrasonic flowmeter is 1/5 of this precision. Obviously, ultrasonic flowmeter can meet higher requirements than electromagnetic flowmeter.
2. The requirement of straight pipe section is low
Because the multi-channel ultrasonic flowmeter adopts double integration to calculate the flow of velocity distribution and area distribution, it can accurately measure the flow in laminar flow and turbulent flow, so as to achieve the accuracy of measurement handover. At the same time, it can realize large flow measurement range and measurement caliber, and has less requirements for straight pipe section (first 10D and later 3D). At present, the products on the market can reach the maximum applicable caliber of DN5000, and the larger the caliber, the easier it is to achieve high precision. Theoretically, the caliber can be arbitrarily large.
3. Higher measurement sensitivity
Another feature of the multi-channel ultrasonic flowmeter is that because the time measurement accuracy is very high, it can reach the picosecond level, so it can achieve high measurement sensitivity, thus ensuring accurate measurement at low flow rates (0.5 m / s can reach 0.5 %). The range ratio is relatively high, up to 400: 1.
4. Continuous flowing pressure construction and online maintenance can be realized
After years of development and research and development, the external clamp ultrasonic sensor has reached the accuracy requirement of 0.5%. The installation is much simpler than that of the plug-in type, and it will not contact with water (medium). It is suitable for scenes with strict requirements on environmental hygiene. The post-maintenance will be more than that of the plug-in, which will easily affect the measurement when installed in outdoor harsh environment.
Plug-in ultrasonic sensor is different from external clamp flowmeter, and its sensor is in direct contact with water (medium). Like other flowmeters, factory-type tubular products with flange connection can also be installed on the pipeline used on site. Most plug-in ultrasonic flowmeters can realize continuous flow and pressure installation through pressure installation tools. This technology is not only applicable to the old pipe network reconstruction project, but also to the new construction project, without expansion joints and connecting flanges. If the pipe network is installed after passing water, the investment and construction period can be saved. After years of use, the scaling on the pipe wall and the scaling on the front end of the sensor due to water quality problems may affect the signal transmission and reception of the sensor. At this time, the sensor can be removed from the sensor under constant current through the on-line installation tool to continue to ensure the accuracy and stability of the flowmeter measurement.
5. Other characteristics
Ultrasonic flowmeter also has a series of other characteristics such as no obstruction to fluid, no pressure loss and flow loss, and low power consumption; Long service life, replaceable transducer for continuous flow installation; Low maintenance and operation costs; It can be powered by mains or batteries. The lightning strike problem caused by power supply can be well solved when the battery is powered; Full set of stainless steel, durable, beautiful and generous.
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