What is the difference between a thermal mass flow meter and a mass flow meter?

May I ask the difference between a thermal mass flowmeter and a mass flowmeter? The thermal type can only be used in gas. It uses the different heat conduction and absorption capabilities of various gases to measure the heat transfer or heat energy loss from heating to induction to correspond to the flow rate. . There are many domestic products, the more famous ones are FCI/BROOKS/Krohne and Sierres. Thermal Mass Flowmeters (TMF for short) are commonly known in China as thermal flowmeters, which measure the fluid mass flow by using the temperature field changes generated when the fluid flows through a pipe heated by an external heat source, or by using the time when the fluid is heated A flow meter that measures the mass flow rate of a fluid based on the relationship between the energy required to raise the fluid temperature to a certain value and the mass of the fluid. Generally used to measure the mass flow rate of gas. It has the characteristics of low pressure loss; large flow range; high precision, high repeatability and high reliability; no moving parts and can be used for monitoring and control of extremely low gas flow. Measure the fluid by using the heat (or temperature) change of the heated fluid Mass flow has a long history. The usual mass flowmeter refers to the Coriolis flowmeter, which uses the Coriolis principle (the interference of the earth's rotation on the curved moving substance) to directly measure the mass of the fluid flowing through it, and can measure gases and liquids. The volume of fluid is a function of fluid temperature and pressure, and is a dependent variable, while the quality of fluid is a quantity that does not change with time, space temperature, and pressure. As mentioned above, the flow measurement values ​​of commonly used flowmeters, such as orifice flowmeters, turbine flowmeters, vortex flowmeters, electromagnetic flowmeters, rotor flowmeters, ultrasonic flowmeters and oval gear flowmeters, are fluid volume flow.

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is something that has been around for a few decades now, enjoying it's heyday back in the electromagnetic flow meter slurry.