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www.sensorsmag.com/components/basics-rotameters

The term rotameter derives from early versions of the floats, which had slots to help stabilize and center them and which caused them to rotate. Today's floats take a variety of shapes, including a spherical configuration used primarily in purgemeters (which will be discussed later on).

www.brooksinstrument.com/en/blog/why-use-a-rotameter...

Rotameters can be installed with other flow measurement technologies and be used to complement each other at an economical price. Simple to install and maintain – Rotameters are quickly installed by connecting the process line to the inlet and the outlet of the rotameter. Make sure the meter is vertical and you are now ready to measure flow.

en.wikipedia.org/wiki/Rotameter

A rotameter requires no external power or fuel, it uses only the inherent properties of the fluid, along with gravity, to measure flow rate. A rotameter is also a relatively simple device that can be mass manufactured out of cheap materials, allowing for its widespread use.

www.omega.com/prodinfo/Rotameters.html

The rotameter is an industrial flow meter used to measure the flowrate of liquids and gases. The rotameter consists of a tube and float. The float response to flowrate changes is linear, and a 10-to-1 flow range or turndown is standard. In the case of OMEGA laboratory rotameters, far greater flexibility is possible through the use of ...

www.wordhippo.com/.../sentences-with-the-word/rotameter.html

The flow rate of hydrogen was adjusted by a rotameter with remote control. Air was introduced into the base of the gas pre-heater via a rotameter. A rotameter, specially designed for diesel engine exhaust gas was used to measure the flow rate of the exhaust and the same is verified using an orifice meter.

www.azom.com/article.aspx?ArticleID=16953

The OMEGA™ laboratory rotameters offer a higher flexibility due to the use of correlation equations. 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.

proteusind.com/how-to-read-a-rotameter

How to read a Rotameter: 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. Let’s summarize the procedure for reading a rotameter: Connecting the rotameter with the fluid flowing source, to initiate the process.

www.reference.com/science/rotameter-work-42c490c2e2a21943

A rotameter works by the use of a float located in a tube, through which flows a particular substance. The float, which is denser than the substance, determines the flow rate by rising and resting at a precise level in the tube as the substance flows through.