Online open channel flowmeter | Where is the online monitoring equipment installed in the Bacher trough

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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? _Baidu Knowledge The way in which the open channel flow comparison device meets the acceptance technical specifications for online monitoring systems of water pollution sources is as follows: Firstly, the open channel flow comparison device needs to meet the relevant requirements in the series of standards for online monitoring of water pollution sources officially announced and implemented by the Ministry of Ecology and Environment. Especially the HJ354-2019 standard, which specifies the acceptance conditions and procedures for online monitoring systems of water pollution sources, including clear requirements for the acceptance methods and indicators of ultrasonic open channel flowmeter systems.

1. Meet the requirements for liquid level comparison error. According to clause 6.3.1 of HJ354-2019 standard, the open channel flow comparison device requires a portable open channel flowmeter (liquid level measurement accuracy ≤ 0.1mm) and an ultrasonic open channel flowmeter to measure the liquid level value at the same water level observation section for comparison testing. During the comparison process, record the data pairs every 2 minutes for 6 consecutive times to ensure the accuracy and reliability of the data. The liquid level measurement results of the open channel flow comparison device need to be compared with the measurement results of the ultrasonic open channel flowmeter. The liquid level comparison error should not exceed 12mm to meet the requirements of the acceptance technical specifications. Secondly, in addition to liquid level comparison er

ror, clause 6.3.2 of HJ354-2019 standard also specifies the requirements for flow comparison error. In the comparative experiment, it is necessary to use a portable open channel flowmeter comparison device and an ultrasonic open channel flowmeter to measure the instantaneous flow at the same water level observation section. After the data is stable, start timing for 10 minutes and read the cumulative flow F1 and F2 of the open channel flow comparison device and ultrasonic open channel flowmeter during this period. Then, calculate the flow comparison error Δ F according to the formula, which should not exceed ± 10% to meet the requirements of the acceptance technical specifications. 3. Ensure stable and reliable performance of the device. In order to meet the requirements of the technical specifications for the acceptance of online monitoring systems for water pollution sources, the open channel flow comparison device also needs to have the following performance characteristics: high-precision measurement: The open channel flow comparison device needs to have high-precision measurement capabilities to ensure the accuracy and reliability of the measurement results. Strong adaptability: Due to the possible differences in wastewater discharge outlets among different enterprises, the open channel flow comparison device needs to have strong adaptability and be able to adapt to different types of wastewater discharge outlets and flow monitoring units. Easy to operate: The operation of the open channel flow comparison device should be simple and easy to implement to reduce the workload and difficulty of operators. Easy maintenance: The maintenance of the open channel flow comparison device should be convenient and fast to reduce

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