Rotameter

Principle of Rotameter:

• Based on the variable area principle.
• A float rises in a tapered tube until the area between the float and the tube balances the gravitational force on the float.
• The flow rate is directly read from a scale on the tube.

Construction of Rotameter:

1. Tapered Tube: Vertically mounted, widens from bottom to top.
2. Float: Moves freely within the tube, indicating the flow rate based on its position.

Working of Rotameter:

• Fluid enters the bottom of the tapered tube, causing the float to rise.
• The float stabilizes at a position where the upward force from the fluid equals the weight of the float.
• The height of the float is read against a scale to determine the flow rate.

Uses:

• Measuring the flow rate of gases and liquids in laboratory and industrial settings.
• Common in medical devices, water treatment plants, and chemical processing.

Advantages:

Disadvantages:

• Not suitable for opaque fluids as the float position is not visible.
• Limited to specific flow ranges and not suitable for very high flow rates.
• Calibration can be affected by changes in fluid density and viscosity.

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