Thermal Mass Flow Meter Working Principle

Volumetric measurements are affected by all ambient and process conditions that influence unit volume or indirectly affect pressure drop while mass flow measurement is unaffected by changes in viscosity.

Thermal mass flow meter working principle.

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. In a typical thermal flow meter gas flowing over a source of heat absorbs the heat and cools the source. Vortex flow meters are ideal for steam flow measurement because other mass flow meters or volumetric flow meters cannot measure steam. Thermal gas mass flow meters are designed based on the principle of thermal diffusion.

The instrument uses the constant temperature difference method to accurately measure the gas. As flow increases more heat is absorbed by the gas. Gas flows by the heated flow sensor and molecules of the gas transport heat away the sensor cools and energy is lost. No temperature and pressure compensation is required.

What is the thermal mass flow meter working principle. Thermal mass flow meter is a true mass flow meter. Thermal mass flow working principle theory and design. Thermal mass flow meters measure the mass flowrate of gases and liquids directly.

Volumetric measurements are affected by all ambient and process conditions that influence unit volume or indirectly affect pressure drop while mass flow measurement is unaffected by changes in viscosity density temperature or pressure. In this video from sierra you ll learn the theory and working principles of thermal dispersion mass flow technology that is used in our gas flow meters. Many mass flow controllers mfc which combine a mass flow meter electronics and a valve are. Thermal mass flow sensors measure the mass flowrate of gases and liquids directly.

Differential pressure techniques can be used for indirect mass flow measurement of steam but as mentioned above direct mass flow measurements are much better than indirect mass flow measurement.