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A Rotameter is a device used to measure the flow rate of liquids or gases in a closed tube. It belongs to the class of variable area flow meters, which determine flow rate by varying the cross-sectional area through which the fluid passes, creating a measurable effect. Inside the tapered tube, a float moves up or down in proportion to the fluid’s flow rate. The float reaches a stable position when the upward fluid force balances with gravity. Any change in flow rate alters the float’s position within the tube. Since the operation depends on gravity, rotameters must be mounted vertically with the wider end of the taper at the top. In the absence of flow, the float naturally settles at the bottom. The flow rate is read from a graduated scale on the side of the rotameter, calibrated for a specific fluid with a known specific gravity. Fluid density plays a significant role in accuracy and performance. For example, all of our rotameters are calibrated using water with a specific gravity of 1.0. Rotameters can also be calibrated for other fluids by applying the same operating principles. Accuracy depends on proper control of pressure, temperature, and flow during calibration. Any variation in fluid density, float weight, or system conditions (such as pressure and temperature changes) can impact readings. To maintain reliability, annual calibration is recommended. © 2024 Paul Water Treatment
A Rotameter is a device used to measure the flow rate of liquids or gases in a closed tube. It belongs to the class of variable area flow meters, which determine flow rate by varying the cross-sectional area through which the fluid passes, creating a measurable effect.
Inside the tapered tube, a float moves up or down in proportion to the fluid’s flow rate. The float reaches a stable position when the upward fluid force balances with gravity. Any change in flow rate alters the float’s position within the tube. Since the operation depends on gravity, rotameters must be mounted vertically with the wider end of the taper at the top. In the absence of flow, the float naturally settles at the bottom.
The flow rate is read from a graduated scale on the side of the rotameter, calibrated for a specific fluid with a known specific gravity. Fluid density plays a significant role in accuracy and performance. For example, all of our rotameters are calibrated using water with a specific gravity of 1.0.
Rotameters can also be calibrated for other fluids by applying the same operating principles. Accuracy depends on proper control of pressure, temperature, and flow during calibration. Any variation in fluid density, float weight, or system conditions (such as pressure and temperature changes) can impact readings. To maintain reliability, annual calibration is recommended.
© 2024 Paul Water Treatment
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