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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 $$$

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 $$$

Tucson, AZ  |  888-290-6060

We are manufacturers of Internally Compensated Laminar (ICL) mass flow meters and mass flow controllers. Flow rates as low as 0.5SCCM full scale, as high as 1500SLPM full scale. Standard features: local display, 14-gas calibrations per unit, digital and analog communication, 100:1 turndown.

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Alicat Scientific, Inc. $$$

Wichita, KS  |  800-835-0113

GPI® is a manufacturer of fluid transfer pumps and liquid flow meters. For over 30 years, we have been manufacturing mechanical, oval gear, paddle wheel and turbine flow meters. Applications for which our products have been used include beverage, chemical, food, fuel, petroleum, pharmaceutical, sanitary and water.

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Great Plains Industries, Inc. (GPI®) $$$

Irvine, CA  |  800-325-1405

The flow meters that we are able to provide will withstand the tests of time in order to provide a long lasting value! We have locations in thirty five countries worldwide and we are dedicated to being wherever you need us to be! We have the knowledge and the capability to work with you closely in order to come up with the perfect product to suit your needs! Visit our website today to learn more about what we may do for you!

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Burkert Fluid Control Systems $$$

Levittown, PA  |  800-800-1908

It is our primary goal that we are able to treat each and every customer as if they were number one in hopes of turning first time customers into lifelong connections as well as to exceed customer expectation one hundred percent of the time in order to keep you coming back to us for all of your diaphragm valve needs! To receive more information about our company get in touch with our customer service staff today!

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Simtech USA $$$
placeholder image Sierra Instruments SIKA USA Alicat Scientific, Inc. Great Plains Industries, Inc. (GPI®) Burkert Fluid Control Systems Simtech USA

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