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The difference between mass flow meter and volume flow meter
Nov 01, 2018

Mass flowmeter 

After years of research, in 1977, MICRO-MOTION Company of the United States first introduced the U-tube mass flowmeter. When this mass flowmeter was introduced, it showed its strong vitality. The utility model has the advantages that the mass flow signal can be directly obtained, and is not affected by the physical parameters of the medium, the precision is ±0.2% of the measured value, and some can reach 0.1%, and the gas, liquid and slurry can be metered into a wide variety, and is particularly suitable. The measurement of the liquefied petroleum gas and the liquefied natural gas by the mass trading medium supplements the shortage of the electromagnetic flowmeter; since it is not affected by the flow velocity distribution on the upstream side, no direct pipe section is required on the front and rear sides of the mass flowmeter. The disadvantage is that the mass flowmeter has high processing precision and generally has a heavy base, so it is expensive; because it is susceptible to external vibration, the accuracy is lowered, and attention should be paid to the choice of installation location and mode.

The difference between mass flow meter and volume flow meter

The volumetric flowmeter is a direct measurement type, such as a louver type, a float type flowmeter. The electronic control mainly has a hot wire (membrane) type, a Karman vortex type. The mass flow meter is an indirect measurement type. The electronic control is mainly converted into flow by pressure sensor, temperature sensor, measuring pressure and temperature.

What is a mass flow meter?

The Coriolis mass flow meter directly measures the mass of the substance by utilizing the influence of the Earth's rotation on the vibration fluid. What is the difference between a thermal mass flow meter and a mass flow meter? A thermal mass flow meter can only be used in a gas, using different gases to conduct heat and absorb differently, measuring heat transfer from heat to induction or heat loss. Corresponding flow rate.

A typical mass flow meter is a Coriolis flowmeter that uses the Coriolis principle (interference of the Earth's rotation to the moving material of the curve) to directly measure the mass of fluid flowing through it, allowing the measurement of gases and liquids. The most famous is MicroMotion.

Most of the various types of gas mass flow meters currently used are volumetric flow rates of metered gases. Since the volume of the gas varies with temperature and pressure, a large measurement error often occurs. If the working pressure changes frequently, it makes the quality meter difficult. The main feature of the gas mass flow meter is that it is not affected by temperature and pressure changes, and its display reading directly indicates the mass flow of the gas. It has a number of advantages:

1. It can be used under normal pressure, high pressure or negative pressure.

2. It can operate normally at normal temperature, 100 degrees, or even higher or lower.

3. Applicable range of wide range, can be used in small flow in the laboratory or in large plants in factory production.

4. The flowmeter's resistance drop is minimal.

5. Strong resistance to medium corrosion.

6. High measurement accuracy.

7. Output the signal signal, which can be remotely displayed, and it is also convenient to cooperate with other instruments to realize the flow record. Self-control or accumulation.