They also do not require temperature or pressure corrections and provide excellent overall accuracy and repeatability over a wide range of flow rates. It also permits their use in trying application areas, including wet (saturated) gas. There is no need for external temperature or pressure devices.Īn advantage of thermal flow meters is that they have no moving parts, which reduces maintenance. The electrical power required to maintain this overheat represents the mass flow signal. Within one second, the circuit will restore the lost energy by heating the flow sensor, so the temperature is restored. The circuit equilibrium is disturbed, and the temperature difference (ΔT) between the heated sensor and the reference sensor has changed. As gas flows by the heated sensor (flow sensor), molecules of the flowing gas transport heat away from this sensor, the sensor cools, and energy is lost. The SAGE proprietary sensor drive circuitry maintains a constant overheat between the flow sensor and the reference sensor. One of the sensors is heated by the circuitry and serves as the flow sensor, while a second RTD acts as a reference sensor and measures the gas temperature. The sensors are resistance temperature detectors (RTDs), and the Sage Metering sensors consist of highly stable reference-grade precision-matched platinum windings that are clad in a protective 316 SS sheath for industrial environments. Either insertion-style probes or in-line flow bodies support two sensors that are in contact with the gas. Thermal mass flow meters measure gas flow based on the principle of convective heat transfer. Principals of Thermal Mass Flow Meter Operation As gas flows by the heated sensor (flow sensor), molecules of the flowing gas transport heat away from this sensor, the sensor cools, and energy is lost. Thermal mass flow meters are ideal for measuring natural gas flow and combustion air flow in combustion processes. We conclude this combustion efficiency series by explaining that thermal mass flow meters are ideally suited as a natural gas flow meter and as a combustion air flow meter for industrial heat sources, such as industrial boilers, steam generators, furnaces, ovens, smelters, and process heaters.
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