Electromagnetic flowmeters measure conductive liquids using Faraday's law. Their performance depends on selected technical parameters. The nominal diameter (DN) must match the pipeline, usually from DN6 to DN3000. Flow velocity typically ranges from 0.5 to 10 m/s; low speeds can reduce accuracy, while high speeds may cause noise and wear. Wide turndown ratio, often 100:1, supports variable flow.

Accuracy is commonly +/-0.5% or +/-0.2% of reading, with repeatability near 0.1%. Minimum conductivity is usually 5 uS/cm, though some models require 20 uS/cm. Pressure ratings include PN10, PN16, PN25, PN40, and higher. Temperature limits depend on the liner. Common liners are PTFE, PFA, F46, and rubber, covering -20 degC to 180 degC. Electrodes use 316L stainless steel, Hastelloy, titanium, tantalum, or platinum for corrosion resistance.

Outputs include 4-20 mA, pulse, frequency, HART, Modbus, Profibus, and Ethernet. Power options are 220 VAC, 24 VDC, or battery. Enclosure protection may be IP65, IP67, or IP68. Ambient temperature, humidity, vibration, grounding, and straight pipe requirements also affect performance. Full-pipe conditions are essential. Meter should be installed with sufficient upstream and downstream straight pipe, and the pipe must remain full. Proper grounding improves stability.

By balancing diameter, velocity, accuracy, liner, electrode, pressure, temperature, and output, engineers ensure reliable measurement in water, wastewater, chemicals, food, and mining.