Glass Tube Rotameter is the most commonly used method for measu

• Posted by xinsheng yuyao August 30, 2021 - Filed in Arts & Culture - 778 views

   

  　　Performance characteristics of Glass Tube Rotameter

  　　1. Linear

  　　The flow rate (volume) through the Glass Tube Rotameter is basically proportional to the area, so most of these flow meters have substantially equal scale increments. The typical indicating rotor scale is about 5% non-linear.

  　　2. Differentiation

  　　An important feature of the Glass Tube Rotameter is that the pressure loss at both ends of the float is constant. Due to friction losses through the fittings, the overall difference on the flowmeter will increase at higher flow rates.

  　　3. Accuracy

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

  　　4. Capacity

  　　The Glass Tube Rotameter is the most commonly used method for measuring low flow rates. The full-scale capacity ranges from the smallest unit of 0.5 cm3/min of water and 30 std cm3/min of air to more than 1200 liters/min of water and 1700 m3/h of air in an 8 cm height meter.

  　　5. Minimum piping requirements

  　　It is usually possible to install an area meter without considering the fitting or length of the straight pipe section or following the meter.

  　　6. Corrosive or difficult to handle liquids

  　　These can usually be successfully processed in an area meter. They include materials such as oil, tar, refrigerant, sulfuric acid, black liquor, beverages, aqua regia, and molten sulfur.

  　　Generally speaking, if the nature of the fluid does not allow the use of traditional differential pressure meters due to the fluid's dirty, viscous, or corrosive nature, some area meters have advantages over other types of meters.

  　　7. Pressure drop

  　　By placing a very light float in an oversized meter, the flow can be processed under a combination of very low-pressure loss (usually 2.5 cm water column or less) and a 10:1 flow range.

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