There are many well documented flow meter technologies that are essentially trying to accomplish the same thing: measure fluid flow rate. Some of the technologies that are entrenched in the market, such as flow meters that utilize differential pressure as the measurement principle, are well understood due to the present installed base. However, an evolving technology such as thermal mass flow is often overcomplicated or not well understood. Instead of measuring flow rate by pressure drop, rotor rotation, or a number of conventional methods, thermal mass flow meters measure flow rate by convection heat transfer. Some of the key advantages are direct mass flow measurement, high sensitivity at low pressures and high turndown.
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