Comparison of characteristics and selection of small flow measurement

①There are many kinds of instruments that can be used to measure small flow. The common feature is that the small diameter is easy to be blocked by impurities in the fluid. Therefore, the filter needs to be installed before the flow meter.
    ②Calibration is easy.
    Due to the small flow measurement range, it is easy to perform off-line calibration or online calibration of the flowmeter in the laboratory. Especially the float flowmeter and the thermal flowmeter.
    ③Do not care about pressure loss.
    In the measurement of small flow rate, the user generally does not mention the requirement of “the pressure loss is as small as possible”. Therefore, in calculating the opening diameter of the orifice plate, in order to improve the accuracy, a higher differential pressure upper limit is often allowed within the range of the allowable pressure loss. value.
   ④Various common instruments are selected for comparison.
    Glass tube float flowmeters are the cheapest, but only suitable for measuring fluids that are not very viscous, clean, and transparent. Metal tube float flowmeters do not require fluid transparency, but they also require viscosity and cleanliness.
    The thermal mass flowmeter has a large range, and the lower limit of the measurable flow rate is smaller, and it is also applied in specific occasions.
    The biggest advantage of the volumetric flowmeter is its ability to measure liquids with higher viscosities and high precision, which is commonly used in the metering of oils.



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