Calibration of open channel flowmeter

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1. Portable open channel flowmeter comparison device (comparison system) that complies with the new national standard HJ-354 HJ-355 (Baidu)

The portable open channel flowmeter comparison device (comparison system) that complies with HJ-35

4. The new national standard HJ-355 is represented by the Qiheng Environmental Protection HX-F3 portable open channel flowmeter. Its core characteristics are highly compatible with the standard requirements. The specific analysis is as follows:

1. The standard compliance comparison method strictly follows the flow comparison error and liquid level comparison error testing methods specified in section 6.3 of HJ 354-2019 for the HX-F3 flowmeter, and meets the requirements of HJ 355 for automatic monitoring and manual monitoring comparison tests.

. The comparison process covers the entire cycle of installation acceptance, operation and maintenance, and data validity judgment, ensuring seamless integration with the new national standard technical specifications. Figure: HX-F3 Portable Open Channel Flow Meter Appearance Comparison Test Process Liquid Level Comparison: Data is automatically collected every 2 minutes, recorded continuously 6 times, and the maximum error value Hi is calculated as the liquid level comparison error. Flow comparison: Timing for 10 minutes, read the cumulative flow F1 of the comparison device and the cumulative flow F2 of the online flowmeter, and calculate the flow comparison error Δ F according to the formula. Calibration requirements: At least one comparative test shall be conducted every quarter. If the results do not meet the requirements in Table 1, the ultrasonic open channel flowmeter shall be calibrated and re compared.

Functional characteristics and technical indicators Multi weir type adaptability supports four standard weir types: triangular weir, rectangular weir, equal width weir, and Bacher trough, covering common open channel flow measurement scenarios and meeting the requirements of HJ 354-2019 for weir type applicability.

. High precision measurement module liquid level measurement error: ≤ 0.5mm, far below the standard allowable range, ensuring the reliability of liquid level comparison data. Flow measurement error: ≤± 1%, in compliance with the strict limitations on flow comparison errors in HJ 354-2019. Acquisition accuracy: 24 bit high-precision signal acquisition module ensures data authenticity. Automated and intelligent operation automatic comparison function: The built-in program can independently complete liquid level and flow comparison tests, and automatically generate comparison reports that meet standards. Bridge pants data storage and output: supports storing 10000 historical records, can be connected to a computer through a USB interface for data analysis, or output results on-site using a micro printer. Human computer interaction optimization: Large screen color LCD touch screen with graphic and text interface, key data password protection, reducing operation threshold. Image: HX-F3 flowmeter touch interface portability and environmental adaptability portable box design: The whole machine weighs only 4Kg, with external dimensions of 400mm × 300mm × 110mm, waterproof rating IP65, suitable for complex outdoor environments. Battery life: Equipped with a built-in DC+16V lithium battery, it can work continuously for 72 hours, meeting the needs of long-term comparison. Working conditions: Temperature range -10 ℃~+

Calibration of open channel flowmeter

1. Portable open channel flowmeter comparison device (comparison system) that complies with the new national standard HJ-354 HJ-355 (Baidu)

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