Rotameter (rotameter) is a device used to measure the flow (flow measurement) that can be used to measure the flow of both liquid and gas The structure of the rotameter consists of a transparent glass tube is a cone rests is vertical, within a float (float) that can move up move down freely according to the flow rate of the flow. In general, it flies made from brass, stainless steel or plastic special. Float inside the rotameter have many shapes. The point read the value displayed on a float. Designed according to fluid properties need to measure flow and area measurements (range) flow rate, such as floating sphere is suitable for flow rate measurement in the low speed region. For other shapes, is appropriate to use each different tasks. Mainly by using corked with edge to create a turbulent (turbulent flow).Generally conical tube made of transparent glass to be able to notice the movement of the float clearly. The durability of rotameter type glass tube based on working conditions. The durability of the glass tube is reduced or breakage easily under conditions of use pressure (pressure) or high temperature (temperature) high. Therefore, in the use of some cases that cannot use the glass tube may have a special design uses a metal pipe. Or use points that cannot be read directly from the float may use the rotameter with air มือวั levels (level measurement) or in motion. (displacement measurement) of cork by calibrated (calibration) the movement phase measured with flow rate occurs.
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