Online open channel flowmeter | The Technical Specification proposes that portable open channel flow comparison devices should be installed for water pollution sources

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How does the open channel flow comparison device meet the technical specifications for the acceptance of online monitoring systems for water pollution sources? The way in which the open channel flow comparison device meets the technical specifications for the acceptance of online monitoring systems for water pollution sources is as follows: Firstly, the open channel flow comparison device must strictly follow the series of standards for online monitoring of water pollution sources officially announced and implemented by the Ministry of Ecology and Environment, especially the relevant provisions of HJ354-2019 on the acceptance conditions and procedures for online monitoring systems for water pollution sources. These regulations specify the acceptance requirements for flow monitoring units, as well as the acceptance methods and technical indicators for flow meters (including ultrasonic open channel flow meters).

1. Meet the acceptance technical indicators for liquid level comparison error: According to Article 6.3.1 of HJ354-2019, the open channel flow comparison device needs to undergo a liquid level comparison test at the same water level observation section as the ultrasonic open channel flowmeter.

. Use a portable open channel flow meter comparison device (liquid level measurement accuracy ≤ 0.1mm) for measurement to ensure that the liquid level comparison error does not exceed 12mm. Flow comparison error: According to Article 6.3.2 of HJ354-2019, the open channel flow comparison device also needs to undergo flow comparison tests with the ultrasonic open channel flow meter at the same water level observation section. After the data is stable, count continuously for 10 minutes, read the cumulative flow F1 and F2 of the open channel flow comparison device and the ultrasonic open channel flow meter respectively, calculate the flow comparison error Δ F, and ensure that it does not exceed ± 10%. 2. Ensure stable and reliable performance of the device. The open channel flow comparison device should be designed reasonably, structurally sturdy, and capable of long-term stable operation. The device should have good waterproof and dustproof performance to adapt to various harsh on-site environments. The measurement system of the device should have high accuracy, good repeatability, and be able to accurately reflect the actual flow situation. Thirdly, the open channel flow comparison device that meets the requirements of standardized verification of discharge outlets should be applicable to common types of discharge outlets, such as triangular thin-walled weirs, rectangular thin-walled weirs, Bacher measuring tanks, etc. When conducting comparative measurements, it is necessary to ensure that the discharge outlet meets the requirements of standardized treatment, such as setting up standardized flow measurement sections, facilitating the measurement of flow rate and velocity, etc. 4. Provide convenient operation and maintenance. The open channel flow comparison device should be designed with a friendly user interface and convenient operation process to facilitate users in comparing measurements and data analysis. The device should provide a detailed maintenance manual and troubleshooting guide, so that users can solve possible problems in a timely manner during daily use.

Fifth, Practical Application Case: Taking the DR102A portable comparison system for open channel flow meters as an example, this system is easy to use, fast

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