What is the working principle of a rotameter?
Working principle of rotameters It consists of a tapered tube; as fluid passes through that tube, it raises the float. Greater volumetric flow exerts more pressure on the float, lifting it higher.
What is rotameter application?
The main application of the rotameter flow meter is to measure the flowrate of liquids and gases. The rotameter is simple to install and maintain, and has gained popularity because it has a linear scale, a relatively long measurement range, and low pressure drop.
What is the unit of rotameter?
A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube. It belongs to a class of meters called variable-area flowmeters, which measure flow rate by allowing the cross-sectional area the fluid travels through to vary, causing a measurable effect.
How do you read a rotameter?
Find the ball floating in the middle of the rotameter column. Look at the bottom of the ball, and see where it lines up with the scale on the side of the meter. This is the flow rate. Rotameters are marked from the top to bottom, increasing to decreasing flow, similar to a thermometer.
What is the basic principle of Venturi meter?
The principle behind the operation of the Venturi flowmeter is the Bernoulli effect. The Venturi measures a fluid’s flowrate by reducing the cross sectional flow area in the flow path and generating a pressure difference.
How many types of flowmeters are there?
Types of Flow Meters. There are two categories of flow meters: gas and fluid or liquid. Fluid flow meters have five subcategories: differential pressure, velocity, positive displacement, mass flow, and open channel.
Where is a rotameter used?
Used for monitoring process, instrument impulse-line, purge-gas, flushing- or cooling-media, make-up, reactor-gas and liquid- feed flows; additional rotameter applications include the following: Chemical injection/dosing – controlling flow rate of fluids to be mixed (added) to the primary fluid.
Where are rotameters used?
Which principle is used in variable head flow meter?
variable area principle
Variable area flowmeters are very simple yet versatile flow measurement devices for use on all types of liquids, gases and steam. They operate on the variable area principle, whereby a flowing fluid changes the position of a float, piston, or vane to open a larger area for the passage of the fluid.
What is Venturi flow meter?
Venturi meters are flow measurement instruments which use a converging section of pipe to give an increase in the flow velocity and a corresponding pressure drop from which the flowrate can be deduced. They have been in common use for many years, especially in the water supply industry.
Which instruments are used by the principle of Venturimeter?
venturimeter working principle:- Venturimeter is an instrument which is used to measure average velocity of a flowing fluid or flow rate of a flowing fluid. The venturimeter is attached to a pipe using flanges so that the fluid which is flowing through the pipe also flows through a venturimeter.
What is the difference between Orificemeter and Venturimeter?
Venturi meter and orifice meter are used for measuring the volumetric flow rate of the fluid that based on the continuity equation and Bernoulli’s equation. The difference between venturi meter and orifice meter are: The coefficient of discharge in the venturi meter is 0.98 while in orifice meter it is 0.6.
What is A rotameter and how does it work?
A rotameter is a commonly used type of industrial flowmeter that is used to measure the flowrate of a liquid or gas. It consists of a tapered tube with a float inside. Rotameters work in a simplistic way: fluid raises the float when it passes through the tapered tube. When there is no flow, the float stays resting at the bottom.
Why is the inside of A rotameter cone shaped?
However, as the inside of the rotameter is cone shaped (widens), the area around the float through which the medium flows increases, the flow speed and drag force decrease until there is mechanical equilibrium with the float’s weight. Floats are made in many different shapes, with spheres and ellipsoids being the most common.
What materials are used in A rotameter float?
The glass type is used for gas and liquid, metal tubes are used for opaque liquids. The rotameter float could be constructed of metals of various densities it could be lead to aluminum, glass, and plastic types are also used. Mostly stainless steel floats are used.
Why is viscosity important in A rotameter?
Due to its reliance on the ability of the fluid or gas to displace the float, graduations on a given rotameter will only be accurate for a given substance at a given temperature. The main property of importance is the density of the fluid; however, viscosity may also be significant.
