Mass flowmeter working principle, in the industrial production, because the material balance, thermal balance and its storage, economic accounting must be all quality, not volume, so in the measurement work, often need to be measured in the volume of the total flow times density conversion into mass flow.However, since the density changes with temperature and pressure, the working pressure and relative density of the fluid should be separately measured to calculate the mass flow when measuring the volume flow of the fluid.Under the condition that temperature and working pressure change frequently, it is difficult to realize the goal of measurement.A mass flow meter is then used to measure the mass flow without manual service for the calculation.

Mass flowmeter classification

Direct mass flowmeter

That is, immediately check and mass flow into the proportion of the quantity, the inspection component immediately reflect the mass flow.

(2) computational mass flowmeter

The mass flow is measured by the instrument panel composed of the volume flow meter and densitometer, and the volume flow and the relative density of the fluid are also checked.

Compensation type mass flowmeter

In addition, the total volume flow of the fluid and the temperature and pressure of the fluid were tested. Then, based on the correlation between the relative density of the fluid and temperature and pressure, the density of the fluid was calculated by the calculation module, and the mass flow value of the fluid was calculated.

There are many kinds of instantaneous mass flowmeter, the most popular one is coriolis mass flowmeter.The coriolis mass flowmeter (CMF) is a kind of instantaneous mass flow meter made by using the coriolis force (coriolis force) which is proportional to the mass flow when the fluid flows in the vibrating tube.The mass flowmeter composed of coriolis force has many forms such as nozzle, elbow, multi-tube, multi-tube, etc.Among them, the most common is the double elbow, which consists of two metal u-shaped pipes, the ends of which are connected and connected to the pipeline under test, as shown in figure 1.So that the fluid can flow in two u-shaped tubes at the same time with A set of piezoresistive transducers in the middle of each tube at A, B, and C.

Coriolis mass flowmeter

Under the effect of additional alternating working voltage, the transducer A produces alternating changing forces, making the two u-shaped tubes vibrate one by one, which is equal to the continuous shaking of the two hoses in the opposite direction. The transducer B and C are used to test the vibration of the two tubes.Since B is on the inlet side and C is on the outlet side, according to the rule that the vibration phase of the inlet and outlet side is ahead of that of the inlet side, the position of the alternating data signal output by C will be ahead of a certain position of B.The size of the phase difference is proportional to the mass flow rate.If the phase difference between the two ac data signals is further converted into dc 4-20ma and other standard data signals, it will become a mass flow intelligent transmitter.

The mass flowmeter has a high precision of measurement and is suitable for measuring the total flow of single-phase current and miscible fluid with high viscosity and density.Because of the structure and so on, this kind of mass flowmeter is suitable for medium and small size pipeline total flow test.

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