Rotameter principle

Flowmeter-Product-Line-Overview Please contact us for a quote or if you have any questions. Wikimedia Commons has media related to Rotameters. The height of the float is directly proportional to the flowrate. Metallic tubes are used where the process fluid with high temperature and pressure. Thus, the rotameter designer can determine the tube taper so that the height of the float in the tube is a measure of flow rate.

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A rotameter is made up of a tapered tube and a float inside it. Similar to glass tube rotameters, the spring-and-piston combination determines the flowrate, and the fittings and materials of construction must be chosen so as to satisfy the demands of the applications. Thus, the rotameter designer can determine the tube taper so that the height of the float in the tube is a measure of flow rate. S Bharadwaj Reddy March 4, March 4, This feature enables the operator to reset or adjust the flow with confidence.

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Rotameter, Basic Flowmeter Principles

Would you like a direct reading rotameter or is a look up table acceptable? Flowmeter-Product-Line-Overview Please contact us for a quote or if you have any questions. The float may be diagonally grooved and partially colored so that it rotates axially as the fluid passes.

The buoyant force exerted on an immersed object is equal to the weight of liquid displaced by the object. Floats which are made from less dense materials will rise higher in the tube and therefore will yield lower flow capacities for the same diameter flow tube. Retrieved from " https: In operation, the rotameter is positioned vertically in the fluid system with the smallest diameter end of the tapered flow tube at the bottom.

The primary limitations of general purpose rotameters are the pressure and temperature limits of the glass metering tube.

In general, there is a linear relationship between the operating temperature and pressure. Also, the rotxmeter can get stuck when flow turns on suddenly or when high flow rates cause the float to be reach its highest mechanical position. The tube is precision formed of borosilicate glass, and the float is precisely machined from metal, glass or plastic.

Be careful to install variable area flowmeters with glass metering tubes in locations where the glass cannot be damaged. In other projects Wikimedia Commons.

This website uses cookies to improve your experience. This capability has considerably expanded the range of applications for the variable area flowmeter, since the measurement rotaketer observed remotely from the process or used for automatic control. The tapered tube is placed vertically in the flow channel with a conical shape inside.

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The drag force for a given fluid and float cross section is a function of flow princciple squared only, see drag equation. The most common design of variable area meter is the cone-and-float type, which is also known as a rotameter. They provide a simple, precise and economical means of indicating flow rates in fluid systems.

It is one of the most commonly rotametwr rotameter in the world. Please contact us for a quote or if you have any questions. Variable area flowmeters are used primarily to set flowrates. The float is now stationary at that level within the tube as its weight is being supported by the fluid forces which caused it to rise.

A change in flowrate upsets this balance of forces. Contact Details Isotopes Tel: One way to change the capacity or flow prihciple of a rotameter is to change the float material, and thus its density, while keeping the flow tube and float size constant.

Wikimedia Commons has media related to Rotameters. What is a Differential Pressure Flow meter?

Thus, k will change in proportion to Q. As the float weight and gravity are constant, the distance float displaced upward is proportional to the flow velocity of rotameetr fluid passing through the tapered tube. A float material, shapes are also varied according to applications considering density.

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