High-temperature turbine flowmeters are designed for reliable flow measurement in hot liquids and gases where standard sensors may fail. Key technical parameters guide correct selection and safe operation. The temperature range often extends from -20°C to 350°C, with special designs reaching 450°C. Pressure ratings commonly range from 1.6 MPa to 42 MPa, depending on body material and connection. Wetted parts usually use stainless steel 304, 316L, Hastelloy, or other heat-resistant alloys, while bearings may be tungsten carbide or ceramic for wear resistance. The rotor and bearing material must match the medium. Accuracy is typically ±0.5% to ±1.0% of reading, with repeatability around ±0.2%. Nominal diameter spans DN4 to DN300, and flow range depends on viscosity and density; low-viscosity media provide better linearity. Output options include 4-20 mA, pulse, HART, RS485, and Modbus. Process connections may be threaded, flanged, clamped, or welded. Protection class is often IP65 or IP67, and explosion-proof versions are available for hazardous areas. The meter requires sufficient straight pipe upstream and downstream, filtration for particles, and periodic calibration to maintain accuracy. When specifying a high-temperature turbine flowmeter, confirm medium compatibility, maximum temperature, pressure, flow range, signal output, and installation conditions. These parameters ensure stable measurement, long service life, and reduced maintenance in power, petrochemical, and thermal systems.