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1... Portable flow meter comparison device for acceptance and operation technical specifications of 355-2019
Referring to HJ 354-201
9. Portable flow meter comparison device for acceptance and operation technical specifications of HJ 355-2019, the following is a detailed explanation:
1. Overview HJ 354-2019 "Technical Specification for Acceptance of Online Monitoring System for Water Pollution Sources (CODCr, NH3-N, etc.)" and HJ 355-2019 "Technical Specification for Operation of Online Monitoring System for Water Pollution Sources (CODCr, NH3-N, etc.)" provide clear requirements for the comparison acceptance and operation of on-site online flow meters. To meet these requirements, manufacturers such as Qiheng Environmental Protection have produced portable open channel flow meter comparison devices that meet market demand, such as the HX-F3 portable open channel flow meter.
2. Technical requirements Measurement accuracy: Liquid level comparison error: According to the acceptance specifications, use a portable open channel flowmeter comparison device and an ultrasonic open channel flowmeter to measure the liquid level value at the unified water level observation section, and conduct a comparison test.
. Record data pairs every 2 minutes for 6 consecutive times, calculate the maximum error value, and require a limit of 12mm for the liquid level comparison index. Flow comparison error: Similarly, use a portable open channel flowmeter comparison device and an ultrasonic open channel flowmeter to measure the instantaneous flow at the observation section of the unified water shielding position for comparison testing. After the data is stable, start timing for 10 minutes and read the cumulative flow of the open channel flow comparison device and the ultrasonic flowmeter separately. Calculate the flow comparison error, and the limit value of the flow comparison error index is required to be ± 10%. Data recording and report generation: Portable open channel flow meters should be able to automatically record liquid level data every two minutes and continuously record 6 times. At the same time, it should be able to accumulate 10 minutes of flow data and compare the results with the on-site online open channel flowmeter. The comparison results should be able to automatically generate a comparison acceptance report, making the comparison results clear at a glance. Calibration and Certification: Each portable open channel flowmeter should be accompanied by a calibration certificate from an authoritative testing and inspection agency when leaving the factory to ensure the accuracy, reliability, and authority of the comparison results. III. Equipment Features: Easy to operate: The portable open channel flowmeter adopts a color touch LCD screen and fully guided operation, which can be operated without professional technical foundation. The entire measurement comparison process is simple and fast, greatly improving work efficiency. High precision measurement: The equipment adopts advanced measurement technology and algorithms to ensure the accuracy and stability of the measurement results. Meet the requirements of technical specifications such as HJ 354-2019 and HJ 355-2019 for flow monitoring units. Portable design: The device is compact in size, lightweight, and easy to carry and use on site. Suitable for flow comparison and measurement work in various complex environments and conditions.IV. Application Example