The characteristics and type selection comparison of micro flow measurement

Characteristics and type selection comparison of micro-flow measurement ①There are many kinds of instruments that can be used to measure micro-flow. Set up a filter with an appropriate mesh number. ② Calibration is easy. Due to the small flow measurement range, it is easier to perform offline or online calibration of the flowmeter in the laboratory. Especially for rotameters and thermal flowmeters, when the actual fluid is not consistent with the fluid used for calibration at the factory, if the measurement accuracy is required to be high, the actual fluid must be calibrated before putting into operation. When the instrument is used for a period of time or the accuracy of the instrument indication is in doubt, the actual fluid is often used to calibrate the instrument. ③Don't care about the pressure loss. In micro-flow measurement, users generally do not mention the requirement of 'minimal pressure loss'. Therefore, when calculating the diameter of the built-in orifice plate opening, in order to improve accuracy, the upper limit of differential pressure is often set within the range of allowable pressure loss. The value is higher. ④ Selection and comparison of various commonly used instruments. Among the several flowmeters mentioned above, glass tube rotameter is the cheapest, but it is only suitable for measuring low viscosity, clean and transparent fluids. The requirements are the same. Rotameters often fail due to the float being stuck by solid impurities, and are often used for general indication.

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