High-temperature turbine flowmeters are precision instruments designed to measure flow rates of gases and liquids in extreme thermal conditions. They operate on a simple principle: fluid flow rotates a turbine wheel, and the rotation speed is proportional to volumetric flow. A magnetic pickup or inductive sensor detects blade passing, converting pulses into flow readings. With heat-resistant materials such as stainless steel, Hastelloy, and ceramic bearings, these meters can handle media from 200°C to over 600°C. Typical applications include superheated steam, thermal oil, exhaust gas, molten salts, and high-temperature chemical processes. Key advantages include high accuracy, repeatability, wide turndown ratio, and fast response. However, selection must consider temperature compensation, lubrication, thermal expansion, and signal stability. Installation requires straight pipe runs upstream and downstream, proper alignment, and insulation to reduce heat loss. Regular inspection of bearings and rotor is essential because high temperatures accelerate wear. When paired with temperature and pressure sensors, the meter can output mass flow or standardized volume flow. Modern designs offer digital displays, HART, Modbus, and 4-20 mA outputs for integration into control systems. They also provide reliable data in steam injection, gas turbine fuel lines, and engine test benches. For reliable performance, choose a meter rated for your maximum operating temperature and verify material compatibility with the process fluid.