The greater the flow, the higher the float is raised. It works on the principle of upthrust force exerted by fluid and force of gravity. Metal tube rotameter, characterized by high strength, safety, and durability, is designed to measure the flow of such medium as liquid, gas, and vapor etc. The float moves upwards by a force obtained by multiplying the pressure differential by the maximum cross sectional area of the float. Most commonly known variable area meter is known as rotameter. The height of the float is directly proportional to the flowrate. Rotameter is variable area flowmeter used to measure fluid flow. Along with the float and tube, a rotameter may come equipped with an adjustment knob, which enables the user to set the flow rate according to their requirement. Variable area flowmeter ariable area flowmeter rotameter. Basic construction, armored metal tube flowmeter the flowrates listed flow range tables are based on floats made of 304 1. The variable area flowmeter is one of the oldest and mature principles in flow measurement with its simple design.
A rotameter is a device that measures the flow rate of liquid or gas in a closed tube rotameter. Due to this flexible and modular system it can be equipped with additional features and various materials suited for all kind of applications. The accuracy of a rotameter is determined by the accuracy of the pressure, temperature, and flow control during the initial calibration. Principles of rotameter flowmeter when fluid or gas flows through a taper tube containing a float, a pressure difference of p1 and p2 is created between upper and lower side of the float. Rotameter variable area flowmeter yokogawa thailand. Pvc fittings are standard to the king instrument 7330 series rotameter. The float takes up a position where buoyancy forces and the float weight are balanced in proportion to flow rate. Apr 09, 2020 rotameter working principle posted by. A device used to measure fluid flow, in which a float rises in a tapered vertical tube to a height dependent on the rate of flow through the tube. Sep 16, 2016 it is an experiment used to measure the volume flow rate. Variable area basic fundamentals flowmeter and descriptions.
King instrument 7520 7530 series rotameter rotameters. The buoyant force exerted on an immersed object is equal to the. It is a variable area meter which works on the principle of upthurst force exerted by fluid and force of gravity. Rotameter experiment ssn variable area flow meter youtube. The black ball is read until it goes off scale, and. Rotameter variable area flowmeter yokogawa south africa. Because operation of a rotameter depends on the force of gravity for operation, a rotameter must be oriented vertically. This stream of gas also causes the rotameter to rotate. Their top six responses are clues as to why a rotameter continues to be successful even after a hundred years.
A rotameter is a device that measures the flow rate of liquid or gas in a closed tube. Connecting the rotameter with the fluid flowing source, to initiate the process. Jul 24, 2016 for the love of physics walter lewin may 16, 2011 duration. Mar, 2016 part 1 introduction to variable area meters rotameter construction principle working 4. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. They belong to the group of devices working with a constant pressure drop. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. For the love of physics walter lewin may 16, 2011 duration. King instrument 7330 series rotameter rotameters instrumart. Metal tube variable area flow meters measures volumetric flow rate of liquid and gases that operates on the float principle. Rotameters are a particular kind of flowmeter, based on the. The float response to flowrate changes is linear, and a 10to1 flow range or turndown is standard. Rotameter basics, variable area flow meter instrumentation.
Rotameter flow meters are devices that can measure the flowrate of liquids and gases. Theory and calibration procedures for the use of a rotameter f. The rotameter type of flowmeter is the most accurate, with an accuracy of 2%. Rotameters are a particular kind of flowmeter, based on the variable area. Working, construction and application of rotameters. Understand the basic principle of operation of an obstruction type flowmeter. Open or close the red globe valves so the circuit for the flowmeter rotameter to be calibrated is open. Features simple measurement principle uncomplicated design local indicator without additional power supply low maintenance suitable for continuous operation cost effective high efficiency. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube. What makes this rotameter different from other brands is known by many users, who value the ease of installation and troublefree operation. It is an experiment used to measure the volume flow rate. An introduction to flow measurement with rotameters.
Pvdf fittings are available as an option to the king instrument 7330 series rotameter. If you have questions or are ready for a quote, simply contact your local abb representative or visit. Rotameters work on the principle of vameters and are used to measure the flow of liquids and gases in pipes and sheathed lines. Rotameter applications extend across industries because it was and still is an economical way of measuring very low to high flow rates. The rotameter gets its name from the rotating float which was developed by rota to provide self stabilization. Rotameter should be designed taking care of process and technical requirements as detailed in the data sheet enclosed. It belongs to a class of meters called variable area meters, which measure flow rate by allowing the crosssectional area the fluid travels through, to vary, causing a measurable effect.
Expired lifetime application number us355575a inventor kenneth d bowen. The most common size is a glass tube rotameter with in 6 mm connections, a range of 0. Design and working principle of rotameter the rotameters are one of the most common flow meters. These fittings are rated for a maximum temperature of f 54c and maximum pressure of 150 psig for sizes 4172w and 125 psig for sizes 90103w. If a wide range of flows is expected, a dualball rotameter can be used. Overview of flowmeter models matheson offers a complete line of variable area flowmeters to meet your application requirements.
Working principle of rotameters the rotameter s operation is based on the variable area principle. In operation, the rotameter is positioned vertically in the fluid system with the. A metal bobbin, usually aluminum, is pushed upward in the flowmeter by the force of the gas passing through the meter. Customers have been asked why they select rotameters. Theory and calibration procedures for the use of a rotameter. The combination of a cone, a float, a scale and a process connection build up a rotameter. We are a wellrounded digital marketing agency that builds your businesss digital identity from scratch and up towards being one of the top searches in search engines. Its main elements are a vertically positioned conical transparent tube 1 and float 2. It has high accuracy working capability and this rotameter are used for wide application depending upon the flow rate, viscosity and turbidity of fluid. This arrangement produces a resistance value coefficient of resistance for the float, which depends on its position in the measuring tube.
In the variable area flowmeters the drop rate in the pressure is constant and the flowrate is a function of area of constriction. Under this principle, the rotameter works with floattapered tube system. Its operation is based on the variable area principle. An example of calibration fluid is water with a specific gravity of 1. It features a tapered metal tube, in which a float is allowed to move freely up and down. King instrument 7520 7530 series rotameter datasheet pdf 846 kb manuals king instrument 7520 7530 series rotameter manual pdf 1. Lets summarize the procedure for reading a rotameter. The float moves freely up and down in the tapered borosilicate glass tube with fluid flow from bottom to top. In the 1990s, yokogawa strengthened its focus on flowmeters through the acquisition of the german flowmeter manufacturer rota. The rotameter consists of a tapered measuring tube and a float. Glass tube rotameter eureka variable area flow meters rotameters work on the principle of variable area. Rgc1 series glass rotameter rgc2 series glass rotameter rqc1 series. An introduction to flow measurement with rotameters azom.
Flowmeters in this type of unit must be vertical fig. Taufiqullah april 9, 2020 331 views the rotameter consists of a vertical tube with a hole in which the position of the buoy is considered vertical according to the flow rate through the tube fig. Rotameter, learn about rotameters and how they work. The buoyant force exerted on an immersed object is equal to the weight of liquid displaced by the object. The rotameter is popular because it has a linear scale, a relatively long measurement range, and low pressure drop. The rotameters operation is based on the variable area principle. A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube. Dustelbergen instrumentation laboratory, department of applied physics, technological university, delft, holland received 21 january 1964.
The variety in cones, floats and scales combine to make the yokogawa rotameter suitable for a very wide range of applications. In so doing yokogawa gained access to 100 years of flowmeter expertise and completed its flowmeter portfolio by adding the rotameter variable area and rotamass coriolis product lines. Overview rotameter type ramc metal short stroke rotameter rakd mini rotameter ragg housing rotameter measurable flow rates water 20c min. Sep 11, 2014 rotameter variable area meter what is rotameter. The rotameter is an industrial flowmeter used to measure the flowrate of liquids and gases. Variable area flowmeter rotameter the original insatech. Working of rotameter variable area flowmeter flow measurement. It is especially suitable for measuring the corrosive and turbid liquid as a result of its fine characteristics of high pressure and temperature resistance. Rotameter working principle animation instrumentationtools. Rotameters can be calibrated for a wide range of fluids by understanding basic operating principles. The flowmeter rotameter on the far left side measures from 0.
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