Principle of mass flowmeter

Mass flow meter principle, the fluid volume is a function of fluid temperature and working pressure, is a dependent variable, and the fluid quality is a time, space temperature, pressure of the change and change of quantity.As mentioned above, the flow measurement value of common flowmeters, such as orifice flowmeter, laminar mass flowmeter, turbine flowmeter, electromagnetic flowmeter, electromagnetic flowmeter, rotor flowmeter, ultrasonic flowmeter and elliptical gear flowmeter, is the total flow of the fluid volume.In scientific research, manufacturing process control, quality control, economic accounting and trade transfer and other theme activities often involved in the fluid volume is generally quality.

The flowmeter is only used to measure the volumetric flow rate of the fluid, which usually cannot be considered according to people's regulations. It is also necessary to try to obtain the mass flow rate of the fluid.Previously, the quality of the fluid could only be obtained indirectly through adjustment, calculation and compensation after measuring the temperature, working pressure, density and volume of the fluid.This kind of measurement method, middlemen, quality flow measurement accuracy cannot be ensured and improved.With the development of modern science and technology, a number of measurement methods and equipment for measuring mass flow have appeared one after another, thus promoting the development of flow measurement technology.

Basic principle of mass flowmeter

The basic concept of mass flowmeter is to apply external heat source to heat the fluid to be measured in the pipeline. The heat energy flows with the fluid and reflects the mass flow rate of the fluid by measuring the calorific (temperature) change caused by the fluid flow.When the composition of the fluid is clear, the specific heat of the fluid at constant pressure is known as a constant.

Therefore, it is known from the above equation that if the output power of heating is maintained stable, the mass flow can be calculated by measuring the temperature difference.If the stable temperature difference method is adopted, that is, the temperature difference between two points is maintained unchanged, the mass flow can be calculated according to the output power of the measured heating.Because the stable temperature difference method is simple and easy to maintain, so more specific applications.

This type of steam flowmeter is used to measure the pressure of a large gas.In order to prevent the components of temperature measurement and heating from being stained and corroded by the fluid due to the immediate contact with the measured flow body, non-capacitive grid measurement method can be used. The electric heater and temperature measuring element are installed in the outside of the thin-walled tube, and the fluid is based on the inside of the thin-walled tube.Non-capacitive grid measurement method is suitable for the measurement of fine flow in caliber pipeline.When used for large flow measurement, the separation method can be chosen, that is, only measure the total flow of the separated part, and then obtain the flow to expand the measurement range.

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