National standard for electromagnetic flowmeter | What is the difference between electromagnetic water meter and electromagnetic flowmeter

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1. Measurement range of large-diameter electromagnetic flowmeter

The measurement range of large-diameter electromagnetic flowmeter is mainly determined by the diameter size, flow rate range, and accuracy level. The diameter range of conventional products is usually between DN300 and DN3000, and some special models can be extended to DN4000. 1. Core measurement range diameter range: Standard products cover DN300 to DN3000 (i.e. 300mm to 3000mm), meeting the measurement needs of the vast majority of municipal water supply and large industrial pipelines. For ultra large projects, non-standard customized models can be selected, with the largest size reaching DN4000. Flow rate range: Typical measured flow rates range from 0.1 meters per second to 15 meters per second, with a lower limit flow rate that can be extended to 0.05 meters per second (depending on the sensor manufacturing process and signal processing capabilities). Accuracy level: Under normal operating conditions, the accuracy is ± 0.5% R (relative error) or ± 0.3% R. In the low flow rate range (such as<1 meter/second), the accuracy will drop to around ± 1.0% R.

2. Key selection parameters: Lining material: Select according to the corrosiveness of the medium, polyurethane or chloroprene rubber is commonly used for conventional aqueous media, and polytetrafluoroethylene (PTFE) or PFA is used for corrosive chemical liquids. Electrode material: 316L stainless steel can be selected for clean water, and for corrosive media, Hastelloy C-27

6, titanium or tantalum is required. Work pressure: DN300-DN1000 caliber usually has a pressure bearing capacity of ≤ 1.6MPa, and the pressure bearing capacity of DN1200 and above caliber gradually decreases. For

National standard for electromagnetic flowmeter

ultra large caliber (>DN2000), it is often limited to ≤ 0.6MPa. Dielectric conductivity: The measured liquid conductivity is required to be ≥ 5 μ S/cm (deionized water is not applicable), and it is recommended to maintain it above 50 μ S/cm in practical engineering to ensure signal stability. 3. Typical application scenarios and range limitations. Municipal water supply and drainage: DN800-DN2600 is the main caliber, with a flow rate range of 0.3~5 meters/second, and it needs to have IP68 protection level and grounding lightning protection. Industrial water metering: DN500-DN1800 caliber is commonly used for circulating water in power plants and cooling water in steel plants. When the medium contains bubbles or solid particles, low-frequency excitation mode should be selected to resist interference. Limitations: It is not possible to measure non-conductive media (such as oils and organic solvents), and installation must ensure full pipe conditions. The requirement for straight pipe sections is usually 10D in the front and 5D in the back (D is the pipe diameter)

4. The latest technical standards and data timeliness. JJG 1033-2023 "Electromagnetic Flow Meter Calibration Regulations" implemented in 2023 specifies the online calibration method for large-diameter instruments. In 2024, mainstream manufacturers such as E+H, Krohne, and Shanghai Guanghua will use zone excitation and dual frequency excitation technology for DN2000 and above products, significantly reducing measurement noise in mud media. At present, the publicly available bidding data for the municipal laughing gas project (such as the Guangzhou water project in May 2024) shows that the purchase price of DN2000 caliber flow meters is about 150000 to 250000

National standard for electromagnetic flowmeter | What is the difference between electromagnetic water meter and electromagnetic flowmeter

1. Measurement range of large-diameter electromagnetic flowmeter

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