Rotameter











The rotameter is used to measure the flowrate of liquids and gases.
Therotameter consists of a,
1)tube
2) float.
3)inlet and outlet
4)scale

principle:
rotameter has a tapered tube withthe upper end larger than the lower end, having a float inside concentrically. The float moves up and downaccording to the flow rate, and the reading taken from.scale on tapered tube.
working:
as the flow Staring to inlet tube.according to the flow.,the float in the tapered tube goes on increaing or decreasing.float and liquid have gravity relations.as the flow increases float accelerate and as the flow reduces float decreases .so actual fliw rate can me measured by linear scale in taperes tube directly According to position of float
Selection of rotameter is depend on various factors such as flow rate,scale.accuracy,cost.apllicatiin and cost and maintaince.
Advantages:
1)Low pressure loss
2)Can measure very low flow rate
3)easy installation
4)variable viscous range
Disadvantages:
1)rotameter must always be vertical
2)Rotameters have generally limitations for manufactured in sizes 

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