Portable open channel flowmeter| Quzhou ultrasonic flowmeter manufacturer

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How to choose a portable open channel flowmeter under HJ 354-2019 standard?

When selecting a portable open channel flowmeter under the HJ 354-2019 standard, it is necessary to consider the acceptance requirements and equipment functional characteristics of the flow monitoring unit in the standard, and comprehensively consider core dimensions such as accuracy, functional adaptability, operational convenience, data recording and report generation ability. Specifically, the following are required: Accuracy requirements: The measurement accuracy of liquid level and flow should meet the standard. Liquid level measurement accuracy: HJ 354-2019 clearly requires the use of a portable open channel flowmeter comparison device with a liquid level measurement accuracy of ≤ 0.1 mm for liquid level error comparison. Therefore, the accuracy of the selected equipment liquid level measurement module must meet this standard to ensure the accuracy of the calculation of the liquid level error value Hi in the comparative test, and to avoid rejection due to insufficient equipment accuracy. Flow measurement accuracy: The comparison of flow error needs to be verified by comparing the cumulative flow F1 (portable device) and F2 (ultrasonic open channel flowmeter). The equipment needs to have high-precision instantaneous flow measurement and cumulative flow calculation functions to ensure the stability and accuracy of flow data within the 10 minute timing period, and reduce flow comparison deviation caused by equipment errors. Functional adaptability: Supports multiple types of weirs and comparison modes. Compatibility of weirs and types: According to HJ 353-2019, it is recommended to use triangular weirs, rectangular weirs, and Bache

r weirs for standardized measurement of open channels. Portable open channel flow meters need to support liquid level flow conversion algorithms for these three types of weirs, or provide replaceable weirs parameter setting functions (such as clicking on the interface to change weirs) to meet the acceptance requirements of different sites. Integrity of comparison mode: The device needs to have both liquid level comparison and flow comparison functions. The liquid level ratio can continuously record 6 sets of data (once every 2 minutes), and the flow ratio can accumulate instantaneous flow data within 10 minutes and automatically calculate the error value to avoid manual recording errors or data omissions. Convenient operation: Efficient equipment deployment for on-site deployment and data entry: Portable open channel flow meters require auxiliary tools such as triangular brackets to ensure quick and stable installation of the equipment on site, reducing measurement errors caused by equipment shaking. Data input and retrieval: The equipment should support automatic saving and retrieval of on-site information (such as weir type, measurement time, environmental parameters, etc.) to avoid duplicate input; At the same time, a manual input interface should be provided to facilitate users to supplement the liquid level and flow data of the online flowmeter, ensuring the integrity of the comparative test. Data recording and report generation capability: automation and traceability Data recording: The equipment needs to be able to display the real-time trend of liquid level and flow rate changes in curve form, making it easy for users to intuitively judge the stability of data; At the same time, all measurement data should be aut

Portable open channel flowmeter

How to choose a portable open channel flowmeter under HJ 354-2019 standard?

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