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Rotameters

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Most commonly, rotameters are used in applications with lower flow rates, and they serve as a cost-effective flow monitoring tool for both gasses and liquids in many applications. Read More…

Rotameters A rotameter is a unique type of flowmeter which utilizes a rotating float to determine the rate of flow in a system. The float is placed in a tube through which the flowing fluid passes, and it moves up or down according to the rate at which the fluid is flowing.
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Leading Manufacturers

Monterey, CA  |  831-373-0200

Sierra manufacturers high performance mass flow meters and controllers for nearly any gas, liquid or steam. Customers choose Sierra when they need an accurate and repeatable flow measurement, short delivery lead times, expert flow advice and long term support. When it matters, choose Sierra. Visit www.sierrainstruments.com.

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Sierra Instruments $$$

West Valley City, UT  |  800-316-5342

Established in 1990, HydraCheck is the market leader in developing, manufacturing, and selling engineered flow meters. Well known for their modular design, high performance and superior quality, HydraCheck boasts a full line of flow meters and transmitters as well as accessories such as displays, counters and indicators to ensure every customer receives the most suitable flow meter for any application.

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HydraCheck $$$

Sturtevant, WI  |  262-886-2695

SIKA is a developer and manufacturer of flow control products and a wide variety of other measuring and monitoring systems. Our inventory includes flow sensors, flow meters, flow switches, and many more. We know that flow solutions aren't one-size-fits-all, which is why we provide consultation and flow management solutions that are individualized and customized to your requirements. When you choose SIKA, you will receive efficient, durable products and customer service tailored to your needs.

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SIKA USA $$$

Itasca, IL  |  888-539-3623

Keyence is a leading supplier of flow meters and many other automation components. Our flow meters are compatible with everything from compressors to receiving tanks to machine drop points, while measuring both overall usage and costly leakage amounts. Additional features include multiple numerical and graphical data displays. Visit our website to find out more about our products.

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Keyence Corporation of America $$$

Wilmington, NC  |  910-392-2490

Since 1984, Eastern Instruments has been engaged in the development of solid particle mass and airflow measuring and control systems for clients in the food, petrochemical and agricultural industries. Many of the “legend” companies use Eastern Instruments’ in-processes, making brands that touch the lives of millions every day.

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Eastern Instruments $$$
placeholder image Sierra Instruments HydraCheck SIKA USA Keyence Corporation of America Eastern Instruments

This kind of flow meter is often called a variable area flow meter due to the fact that it is comprised of a slightly narrowing tube. The float moves vertically within this tube as the fluid enters through the bottom of the tube. The fluid pushes the float upward until the force of gravity on the float equalizes with the force of the fluid on the float. Once these forces come into equilibrium, the float will come to rest at a specific vertical position which corresponds to the rate of the fluid flow.

Reverse Flow Inline Flow Meter Rotameters - Hydra-Check

The vertical tube has graduations marked along its height which are used to visually read the flow rate. When the float comes to rest, the flow rate can be determined by simply finding and reading the graduation with which the float most closely aligns.

For the most part, flow readings are taken visually with rotameters, so they are often made from transparent materials such as glass, making the float visible to an operator. However, some rotameters are fitted with electronic sensors to transfer readings digitally. These rotameters do not need to be transparent and thus can be made of metal or other opaque materials.

These flow meters can also be manufactured in a multiple tube design, allowing them to measure the flow of multiple streams at the same time.

Rotameters are an excellent option for many different industrial applications due to the simplicity, versatility, and accuracy they provide. Installing and using rotameters is incredibly easy. They can be installed just about anywhere in your fluid flow system since they do not require straight pipe runs, and a flow reading can be made by simply taking a look at where the float is located in the meter.

Rotameters are also very flexible and come in a diverse range of configurations and constructions. Single tube rotameters can be used for essentially any simple flow metering application, while multiple tube rotameters are perfect for more complex applications involving more than one flowing stream. Though they are simple, rotameters still provide exceptionally accurate volumetric flow rate measurements, making them one of the top flow meters in the industry.

When purchasing a rotameter, it is important to consider several different factors and features. You should take into account which type of fluid you will be monitoring; rotameters are more frequently used with non-corrosive materials. Other factors include the number of flowing streams and whether a metering valve is needed for your applications. It is best to consult a flow meter manufacturer with these considerations and your application requirements, and they can help you find the right meter for you!

Rotameter Informational Video