The heater can protrude into the fluid stream or can be external to the pipe. The components of a basic thermal mass flow meter include two temperature sensors and an electric heater between them. These meters operate either by introducing a known amount of heat into the flowing stream and measuring an associated temperature change or by maintaining a probe at a constant temperature and measuring the energy required to do so. Thermal mass flow meters also measure the mass flowrate of gases and liquids directly. When a fluid is flowing in a pipe and it is subjected to Coriolis acceleration through the mechanical introduction of apparent rotation into the pipe, the amount of deflecting force generated by the Coriolis inertial effect will be a function of the mass flow rate of the fluid. Types of Mass Flow Meters Coriolis Mass Flow MetersĬoriolis mass flow meters introduce an artificial Coriolis acceleration – an apparent force that acts relative to a rotating frame – into the flowing stream and measure mass flowrate by detecting the resulting angular momentum. Thermal mass flow meters also measure the mass flow rate of liquids and gases directly and the function on the principles of heat transfer using a heating element and temperature sensors. Inertia meters, known as Coriolis flow meters, use the Coriolis Effect to measure mass flow rate. The two flow technologies that are used to measure mass flow are inertial and thermal. With these being the most critical flow measurements in a processing plant, the reliability and accuracy of mass flow detection is of the upmost importance. Mass flow measurement is the basis of most recipe formulations, material balance determinations, billing, and custody transfer operations throughout industry. Mass flow rate measures mass per unit time, differing from volumetric flow rate – which measures volume per unit time. A mass flow meter is a type of flow meter and is a device that accurately measures the mass flow rate of a fluid moving through a pipe.
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