Non standard channel flowmeter | Technical requirements for ultrasonic open channel flowmeter

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HJ355-2019 "Technical Specification for Operation of Online Monitoring System for Water Pollution Sources" proposes that water pollution sources should be installed HJ355-2019 "Technical Specification for Operation of Online Monitoring System for Water Pollution Sources" indeed proposes that portable open channel flow comparison devices should be installed for water pollution sources. The following is a detailed explanation of this requirement: HJ355-2019 "Technical Specification for Operation of Online Monitoring System for Water Pollution Sources" clearly stipulates the requirements for the operation and high permeability of online monitoring systems for water pollution sources, including the installation and use of ultrasonic open channel flow meters, as well as specific requirements for using portable open channel flow meter comparison devices for comparison testing.

1. Installation of Ultrasonic Open Channel Flow Meter According to the "Technical Specification", ultrasonic open channel flow meters need to be installed for water pollution sources to measure the flow rate of sewage discharged from water pollution sources. Ultrasonic open channel flowmeter is a non-contact flow measurement instrument that calculates the flow rate by measuring the flow velocity and liquid level of the fluid in the open channel.

II. Use of Portable Open Channel Flow Meter Comparison Device In order to ensure the accuracy and reliability of ultrasonic open channel flow meters, the Technical Specification requires the use of portable open channel flow meter comparison devices for on-site comparison of ultrasonic open channel flow meters.

. Requirements for comparison device: The portable open channel flowmeter comparison device needs to use a magnetostrictive level gauge and a standard flow calculation formula for on-site comparison. The accuracy of liquid level measurement should reach or exceed 1mm to ensure the accuracy of comparison. Comparison experiment content: Liquid level comparison: Use a portable open channel flowmeter comparison device and an ultrasonic open channel flowmeter to measure the liquid level value at the same water level observation section, and conduct a comparison experiment. Flow comparison: Use a portable open channel flow meter comparison device and an ultrasonic open channel flow meter to measure the instantaneous flow at the same water level observation section for comparison experiments.

III. Working Principle of Portable Open Channel Flow Meter Comparison Device Portable open channel flow meter comparison devices are usually composed of magnetostrictive liquid level sensors, wireless data transmission modules, image recognition systems, and tablet computers.

. Magnetostrictive liquid level sensor: used to measure the liquid level in open channels, with high accuracy and stability. Wireless data transmission module: Transmit measurement data (liquid level) wirelessly to the receiving terminal (tablet). Image recognition system: Real time collection of data from open channel flow meters and comparison with portable open channel flow meter comparison devices. Tablet computer: As a receiving terminal, it displays and stores comparison results for easy analysis and judgment.

Fourth, the performance indicator flow measurement error of the comparison device is ≤ 3% to ensure the accuracy of the comparison. Liquid level measurement error: ≤ 0.7mm, better than the 1mm required by the Technical

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