Spring and piston flow meters can be used for most fluids, including corrosive liquids and gases. We'll assume you're ok with this, but you can opt-out if you wish. The tapered tube is placed vertically in the flow channel with a conical shape inside. A float material, shapes are also varied according to applications considering density. A potential safety hazard can be created if a glass metering tube breaks, especially when dangerous fluids are present in the flowmeter.
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Rotameter, Basic Flowmeter Principles
The operator observes the meter, and adjusts the valve to bring the process flow to the proper flowrate. A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube. This article needs additional citations for princpile. Rotameters with all plastic construction are available for applications where metal wetted parts cannot be tolerated, such as with deionized water or corrosives.
Variable area meters are widely used for metering gas but different types are available for a variety of different fluids. However, it is important to note that because the float position is gravity dependent, rotameters must be vertically oriented and mounted.
Views Read Edit View history. The float moves up or down in the tube in proportion pdinciple the fluid flowrate and the annular area between the float and the tube wall. Be careful to install variable area flowmeters with glass metering tubes in locations where the glass cannot be damaged. Do you require a valve to regulate the flow? Variable area flowmeters are used rotameterr to set flowrates. Fluid dynamics Flow meters. In other projects Wikimedia Commons.
However, the difference in this application is that the value inside the radicand is constant eotameter the pressure difference will remain constant and the fluid density will likely remain constant as well. Flowmeters are used in fluid systems liquid and gas to indicate the rate of flow of the fluid. A uniformly tapered flow tube, a float, and a measurement scale. Relative flow capacities for some rottameter float materials can be seen from the link below: See More Rotameters Models.
The buoyant principl exerted on an immersed object is equal to the weight of liquid displaced by the object. This shows if the float is stuck since it will only rotate if it is free.
One way to change the capacity or flow range of a rotameter is to change the float material, and thus its density, while keeping the flow tube and float size constant. Metal Tube Flow Meters For higher pressures and temperatures beyond the practical range of glass tubes, metal tubes are used.
From Wikipedia, the free encyclopedia. This page was last edited on 7 Novemberat Please contact us for a quote or if you have any prindiple.
The float moves up or down in the tube in proportion to the fluid flowrate and the annular area between the float and the tube wall. A buoyancy correction term is required for liquids and dense fluids.
Variable Area Flow meters Working Principle Instrumentation Tools
Ultimately, a point is reached where the flow area is large enough to allow the entire volume of the fluid to flow past the float. Please help improve this article by adding citations to reliable sources. The float will find equilibrium when the area around float generates enough drag equal to weight - buoyancy. With plastic end fittings, care must be taken in installation, not to distort the threads. With gases, buoyancy is negligible, and the float responds to the velocity head alone.
They can also control the rate of flow if they are equipped with a flow control valve. Variable area flowmeters that require upward flow may not suitable in many applications where the fluid flows using only gravity. Fluid enters princple the bottom of the tapered tube, then some of the fluid strikes directly into the float bottom and others pass aside the float.
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