High-temperature electromagnetic flowmeters are designed for reliable flow measurement in hot conductive liquids. Their technical parameters determine safety, accuracy, and service life. Typical medium temperature ranges are 120 degC, 180 degC, and up to 250 degC with special coils and insulation. Liners must resist heat and corrosion; common choices include PTFE, PFA, and ceramic. Electrode materials such as 316L, Hastelloy, titanium, and tantalum are selected according to chemical compatibility. Nominal diameter usually spans DN10 to DN1000. Pressure ratings commonly reach PN16, PN25, or higher, depending on flange standards. Accuracy is typically +/-0.5% or +/-1.0% of reading, with repeatability around 0.1%. The meter requires a minimum conductivity of about 5 uS/cm, though higher thresholds may apply. Recommended flow velocity is 1-5 m/s to reduce wear and improve stability. Outputs include 4-20 mA, pulse, and RS485/MODBUS. Protection classes often reach IP65 or IP68 for harsh sites. Proper grounding, thermal isolation, and regular verification are essential. These parameters help users select a high-temperature electromagnetic flowmeter for boilers, heat transfer, chemical processing, and energy systems. Ambient temperature is commonly -20 to 60 degC. Flange standards include DIN, ANSI, and JIS, and transmitters may support HART, MODBUS, and pulse outputs. Calibration, grounding, and proper installation improve zero stability and long-term accuracy in hot process lines.