Difference between electromagnetic water meters and electromagnetic flow meters

　　1. Application Areas

　　Electromagnetic water meters: Mainly used in municipal water supply areas, such as clean water and raw water metering, to solve the problem of urban and rural water supply settlement.

　　Electromagnetic flowmeters: Suitable for various conductive media in industrial production (such as chemical industry, wastewater treatment, etc.), and also suitable for scientific research and process control.

　　2. Differences in Technical Indicators

　　Measurement range ratio: Electromagnetic water meters can reach 400, which is much higher than ordinary electromagnetic flowmeters (20-25), suitable for low-flow measurement (lower limit as low as 20-30 mm/s).

　　Accuracy: Electromagnetic flowmeters are usually ±0.5% (high accuracy reaches ±0.2%), while electromagnetic water meters are mostly Class II (±2%).

　　Repeatability: Electromagnetic flowmeters use this as a core indicator (such as ±0.16% corresponding to 0.5 level), while electromagnetic water meters pay more attention to starting flow and long-term stability.

　　3. Structure and Operating Environment

　　Nominal diameter: The maximum nominal diameter of electromagnetic water meters is DN300, while the nominal diameter of electromagnetic flowmeters can reach DN3000.

　　Power supply: Electromagnetic water meters mostly use batteries (low-power design), while electromagnetic flowmeters rely on mains power or external power supplies.

　　Protection: Electromagnetic water meters meet the IP68 standard (higher waterproof level), while the protection level of electromagnetic flowmeters varies depending on the environment (such as IP66 or explosion-proof design).

　　4. Implementation Standards and Maintenance

　　Standards: Electromagnetic water meters follow the water meter standard "GB/T 778", and electromagnetic flowmeters follow the industry standard "JB/T 9248".

　　Maintenance: The inspection cycle of electromagnetic water meters is longer (about 2 years), while electromagnetic flowmeters are usually maintained annually by professionals.

　　Overview: Electromagnetic water meters are flow meters specifically designed for water, low power consumption, and wide range, while electromagnetic flowmeters are general-purpose industrial, high-precision, multi-scenario measurement tools. The core difference stems from the targeted design for different application scenarios.