How is a rotameter designed?

Rotameters, also referred to as variable area flow meters, are widely used to measure gas and liquid flow. The basic principle of rotameter design includes A float that rotates as it is pushed by the flow. The rotation speed of the float indicates the rate of the flow.

The two basic components of every rotameter are The tapered metering tube and the float. Tube sizes vary from ¹/₁₆ To 4 in., with a ¹/₈–2 in. range being the most common. Of course, each model has limitations as to capacity, temperature, pressure, and, in the case of liquids, viscosity.

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.

A rotameter (variable area flow meter) is a flow meter that Measures the volumetric flow of liquids and gases. There is no difference between a rotameter and a flow meter, and these terms are interchangeable.

A rotameter Requires no external power or fuel, it uses only the inherent properties of the fluid, along with gravity, to measure flow rate.

The variable-area flowmeter is called a rotameter Because the float spins, or rotates, as the flow passes it. The spinning float is a clear indication that fluid is flowing. Variable-area technology was invented in Germany more than 100 years ago.

Chapter 2: Types of Rotameters. Rotameters can be used in a variety of applications and each of the instruments has unique elements which meet these different applications. The types of rotameters include the Glass tube flow meters, armored purge meter, and the flanged armored rotameter.

₹2,399.00 FREE Delivery.

Rotameters are available for a wide range of liquids but are most commonly used with water or air, for example, in demineralized (DM) water. They can be made to reliably measure flow Down to 1% accuracy.

Metal-tube rotameters can be used as flow transmitters, with analog or digital controls; they can detect the float position through magnetic coupling. This then moves a pointer in a magnetic helix to give an external indication of the float position.

Rotameters are Volumetric meters (as opposed to meters that measure mass) by nature so for liquids, they need no accommodation for changes in temperature and pressure as liquid volume is not greatly affected by changes in these 2 operating conditions.

The metering tube in a rotameter is installed vertically (Figure 2-15) and the small end is at the bottom. The fluid that is going to be measured enters at the bottom of the tube, passes upward around the float, and exits the top. If there is no flow, then the float stays at the bottom.

Most flow meters can be installed in any direction, except for the Rotameter, which can only be mounted in a Vertical direction with a flow from bottom to top.

The tapered glass tubes are positioned vertically in the fluid flow Since the float position is based on gravity. As liquid enters the bottom of the tube, the float begins to rise. A float within the tube rides upward in relation to the amount of flow.

Ideally, a rotameter is designed and calibrated At the same temperature and pressure, and with the same process gas, for which it will be used. This ensures that the density of the gas is the same, although it is often too difficult to replicate the exact conditions of use.

Connecting the rotameter with the fluid flowing source, to initiate the process. The float starts to swim in the middle of the tapered pipe due to the velocity of the fluid. The side of the meter has a scale. The lower and upper level of the float is to be measured by that scale, which gives the flow rate.

Re: What is the reason for tapering the tube of rotameter? If it were the same diameter, the ball would either stay at the bottom or rise all the way to the top. The taper Allows the annular area between the ball and the tube to be proportionate to the flow, in a balanced condition.

The tapered glass tubes are positioned vertically in the fluid flow Since the float position is based on gravity. As liquid enters the bottom of the tube, the float begins to rise. A float within the tube rides upward in relation to the amount of flow.