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Types of flow meters - focus on microfluidic control technology

Differential pressure flowmeter
According to the Bernoulli energy equation, installing a throttle in a fluid generates a differential pressure, and indirectly determining the fluid measurement flowmeter by measuring the differential pressure. Such as orifice flowmeter, venturi flowmeter, rotor flowmeter and so on. The orifice plate type flowmeter has firm structure, stable and reliable performance, long service life; generally low measurement accuracy, high requirements for on-site installation conditions, straight pipe sections, large pressure loss (referring to orifice plates, nozzles, etc.)
2. Speed flow meter
Flow meters that measure flow using the amount of fluid velocity inside the pipe are collectively referred to as velocity flow meters. The utility model is characterized in that the flow velocity of the fluid is directly measured to realize the measurement of the flow rate, the calculation formula is relatively simple, the output is a pulse frequency signal, and the total measurement and the computer connection are also provided, the measurement range is wide, the structure is simple, and the maintenance is convenient. Such as ultrasonic, turbine, vortex, electromagnetic and so on.
3. Volumetric flowmeter
Using a standard small volume continuous top displacement measurement, a cumulative flow rate flow meter is obtained based on the volumetric value of the standard solvent and the cumulative number of consecutive measurements. Commonly there are oval gear flowmeters, scraper flowmeters, rotary piston flowmeters, etc. The volumetric flow meter is especially suitable for high viscosity liquid flow measurement. Widely used in the measurement of oils such as crude oil. However, due to the gear transmission, the block of the pipe is the biggest hidden danger. Volumetric meters are heavier and require filters for installation. Life is limited and maintenance is often required.
4. Mass flow meter
Direct or single measurement of the mass flow meter. It is divided into direct type, indirect type and compensation type. The direct mass flow meter has thermal type, double orifice plate, double turbine, Coriolis, etc. The indirect type mass flow meter measures the flow rate and density of the fluid. The mass flow is obtained by the arithmetic unit; the compensating mass flow meter uses the relationship between the fluid and the temperature pressure, and compensates the influence of the change in the fluid density to obtain the mass flow.

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