The flow (volume) of the Glass Tube Rotameter is basically prop

  •   In the Glass Tube Rotameter, in addition to the floating effect of the fluid flowing through, the weighted float or plumb bob in the vertical tapered tube is lifted to the equilibrium position between the plumb downward force and the fluid upward force. The float passes through the annular orifice.

      Features of Glass Tube Rotameter:

      Linearity: The flow rate (volume) through the Glass Tube Rotameter is basically proportional to the area, so most of these flow meters have the same proportional increase. The typical indicating rotor scale is not linear around 5%.

      Differential pressure: An important characteristic of the Glass Tube Rotameter is that the pressure loss through the float is constant. Due to friction losses through the fittings, the general difference on the flowmeter will increase at higher flow rates.

      Accuracy: The most common accuracy is ± 2% of full-scale reading. This increases significantly with the individual calibration and the length of the scale. Very good repeatability

      Capacity: Glass Tube Rotameter is the most commonly used method for measuring low flow. Large-scale capacity ranges from 0.5 cm3/min of water to 30 cm3 standard/min. The smallest unit of air exceeds 1200 liters/min. 8 cm height of the water and 1700 cubic meters/hour of air.

      Minimum pipe requirements: The area meter can usually be installed without considering the connection or length of the straight pipe program or following the instrument.

      Corrosive or difficult to handle liquids: these can usually be managed successfully in an area meter. They include materials such as oil, tar, coolant, sulfuric acid, black liquor, beverages, aqua regia, and molten sulfur.

      Pressure drop: By placing a very light float on a larger meter, the flow can be managed through a combination of very low-pressure loss (usually 2.5 cm water column or less) and a 10:1 flow rate

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