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Thermal mass flow meters, also known as thermal dispersion or immersible mass flow meters, comprise a family of instruments for the measurement of the total mass flow rate of a fluid, primarily gases, flowing through closed conduits. A second type is the capillary-tube type of thermal mass flow meter.
Thermal mass, or the ability to store heat, is also known as volumetric heat capacity (VHC). VHC is calculated by multiplying the specific heat capacity by the density of a material: Specific heat capacity is the amount of energy required to raise the temperature of 1kg of a material by 1C.
The differential pressure flow meter is the most widely used flow technology in industrial process measurement and control, natural gas custody transfer measurement and many other applications.
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. Mass flow rate measures mass per unit time, differing from volumetric flow rate which measures volume per unit time.
What is the Accuracy for Thermal Dispersion Flow Meters? Thermal mass flow meter accuracy is usually not quite as high as Coriolis, Magnetic, Ultrasonic, and Vortex flow meter technology, but still offers an above average accuracy which typically ranges from 1% to 3%.
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Thermal mass flow meters can have very high rangeability and reasonable accuracy, but they also have serious limitations. Potential problems include the condensation of moisture (in saturated gases) on the temperature detector. Such condensation will cause the thermometer to read low and can lead to corrosion.
Different Technologies / Types of Flow Meters Differential Pressure Flow Meters. This type of flow meter relies on Bernoullis equation to judge the flow of fluids through a pipe. Positive Displacement Flow Meters. These are also called mechanical flow meters. Velocity Flow Meters. Mass Flow Meters. Open Channel Flow Meters.
Coriolis mass flow meters measure mass through inertia. A liquid or gas flows through a tube which is being vibrated by a small actuator. This artificially introduces a Coriolis acceleration into the flowing stream, which produces a measurable twisting force on the tube resulting in a phase shift.
Thermal mass flowmeters prices are much more affordable. They are typically preferred for measuring smaller flow rates at low pressure. However, as they are affected by variations in density, temperature, and pressure, they require a real flow for calibration, to docHub high accuracy (
Thermal mass flow meters measure the heat transfer as the gas flows past a heated surface. The gas molecules create the heat transfer, so the greater the number of gas molecules in contact with the heated surface, the greater the heat transfer.

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