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1... Technical Specification "proposes that portable open channel flow comparison devices should be installed for water pollution sources. The Ministry of Ecology and Environment has issued HJ355-2019" Technical Specification for Operation of Online Monitoring System for Water Pollution Sources ", which states that water pollution sources should be equipped with ultrasonic open channel flow meters and a portable open channel flow meter comparison device should be used for on-site comparison. The comparison device should include a magnetostrictive level gauge and a standard flow calculation formula for accurate comparison. The technical specifications stipulate that water pollution sources must perform a comparison between liquid level and flow rate. By using a portable open channel flowmeter comparison device (with a liquid level measurement accuracy of no more than 1mm) and an ultrasonic open channel flowmeter, the liquid level value and instantaneous flow rate at the same water level observation section were measured separately, and a comparison experiment was conducted. The main components of the open channel flowmeter comparison device are magnetostrictive liquid level sensor, wireless data transmission module, image recognition system, and tablet computer, which are specifically used to compare the measured values of the tested flowmeter to ensure its accuracy. The wireless transmission method transmits measurement data (liquid level), and the image recognition system collects open channel flowmeter data in real time, compares two sets of data, and generates the final width and diameter evaluation. The flow measurement error requirement is not more than 3%, and the liquid level measurement error is not greater t
2. Portable open channel flowmeter
The portable open channel flowmeter is a high-precision flow velocity and flow detection instrument that uses ultrasonic detection technology and is suitable for working conditions such as rivers, open channels, and pipelines. It has the characteristics of good stability, low environmental impact, and low maintenance frequency. It is widely used in coastal cities, river chief management, inland river monitoring and other scenarios.
. The main feature is high measurement accuracy: using ultrasonic detection technology, it can accurately capture flow rate and liquid level information, ensuring the reliability of measurement results. For example, in open channel flow measurement, its accuracy can meet the strict requirements of environmental monitoring and engineering management. Good stability: The design without rotating parts reduces mechanical wear and measurement errors caused by component aging, and can maintain stable performance even after long-term use. Less affected by environmental factors: Ultrasonic technology has strong adaptability to environmental changes such as temperature and humidity, and can work normally under complex working conditions, such as sediment and floating objects in natural rivers, without significantly interfering wit
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