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Rotometers

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Rotometers

Rotometers are flow meters named for the rotating float which functions as the meter’s indicating element. A float moves up and down a tapered tube according to the rate of flow.

Rotometers are typically used to measure low flow rates and are an economical method of indicating and controlling gas and liquid flow for several applications.
Typically, rotometers are used to measure smaller flows and the reading is usually done locally, although transmission of the readings is possible. Read More…Request for Quote

Rotometers Rotometers are flow meters named for the rotating float which functions as the meter's indicating element. A float moves up and down a tapered tube according to the rate of flow.
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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

Most rotometers are made of glass with markings on the outside so that flow readings can be taken visually, similarly to flow indicators; however, metal rotometers are also available. Rotometers are advantageous due to the simplicity of the device and the constant pressure drop they offer. Also, rotometers do not require straight pipe runs for installation so installation can be performed almost anywhere.

The selection of the appropriate rotometer for a particular application requires attention to a few key details. These include which gas will be used, the required flow rate, the number of streams to be measured and whether a metering valve is included.

Rotometers are favorable for their simplicity, versatility, accuracy, and ease of use. For all these reasons, rotometers are the flow meter of choice for many industries. Rotometers consist of a float that moves vertically through a slightly narrowing tube. As fluid enters the bottom of the rotometer, the float is forced upward until the force is balanced by gravitational forces.

Like peak flow meters, graduations are marked on the tube so that the level of the float can be aligned with a gradient to provide an accurate, fast and easy-to-understand flow rate reading. Rotometer tubes are read directly in standard cubic feet per hour of air. Rather than using a constant restriction area and a variable pressure differential, rotometers use a variable restriction and a constant pressure differential to measure flow.

Rotometers may be designed to measure the flow rate of single or multiple streams. Single tube rotometers are usually mounted directly on the piping and they are used with non-corrosive materials.

Single tube rotometers are used if there are special conditions for the measurement or when a basic flowmeter will suffice. Multiple tube rotometers are mounted to a tripod base plate with feet to level the assembly. They may also be bench or wall mounted. This kind of rotometer takes measurements for flow rates of more than one stream of gas or liquid. Other variations are also available.

Rotometer Informational Video