rotameter

                                                              Rotameter

The rotameter is used to measure the flow rate of liquids and gases.

The rotameter consists of a,

1)tube

2) float.

3)inlet and outlet

4)scale

principle:

rotameter has a tapered tube with the upper end larger than the lower end, having a float inside concentrically. The float moves up and down according 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 increasing or decreasing. float and liquid have gravity relations.as the flow increases float accelerate and as the flow reduces float decreases .so actual flow rate can be 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. Application  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