Rotometer Manufacturers and Suppliers

IQS Directory provides a detailed list of rotometers manufacturers and suppliers. Find rotometers companies that can design, engineer, and manufacture rotometers to your specifications. Peruse our website to review and discover top rotometers manufacturers with roll over ads and complete product descriptions. Connect with the rotometer companies through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of roto flow meters, btu flowmeters, and rotameters of every type, IQS is the premier source for you.

  • Monterey, CA

    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

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  • Oak Creek, WI

    AW-Lake Company manufactures flow monitoring equipment and goes to market through four brands: TRICOR Coriolis Technology, LAKE Monitors, AW Gear Meters and Turbine Flow. The broad range of flow meters include coriolis mass, positive displacement, variable area and turbine technologies. We service many industries, including oil & gas, automotive, food & beverage, chemical processing and pharmaceuticals.

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  • Altus, OK

    Turbines is an ISO 9001:2000 certified manufacture specializing in the design of high quality, cost-efficient rugged turbine flow meters for industry oil and gas, and business flow measurement applications that require accuracy, repetition and reliability. We have established ourselves as a trusted leader in the field of flow measurement. We also offer a wide range of accessories such as centering rings, nuts, bolts, extension cables and more.

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  • Spartanburg, SC

    At Niagara Meters, we specialize in providing high-quality flow meters and comprehensive solutions to meet the diverse needs of industries worldwide. With our dedication to excellence and extensive experience, we have established ourselves as a trusted leader in the field of flow measurement. Our product portfolio encompasses a wide range of flow meters meticulously engineered to deliver accurate and reliable measurement across various fluid types and flow rates.

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Rotometers Industry Information


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.

Quick links to Rotometers Information

Benefits of Rotometers

Rotometers come in simple and complex designs. Some rotometers can be equipped with multiple features for checking material properties such as temperature, pressure, viscosity and more. There are many advantages and disadvantages to rotometers. One of the major advantages to rotometers is the fact that these devices have a simple design with few components which makes it easy to mass produce. Most rotometer designs require no electricity to operate which makes it ideal for applications where electricity would be a hazard or in situations where no electricity is available. The placement of the tube is very critical because gravity is a key factor for proper functionality of the rotometer. Another disadvantage of rotometers is the accuracy of the readings become less reliable at low flow rates. Rotometers come with an excellent value in terms of repeatability and ease of use. These devices are quick to respond to any changes in the flow path. An example of a common rotometer can be found in the medical field. Medical personnel typically utilize a rotometer in oxygen regulators.

Rotometer Design

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 flow meter 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.

Applications of Rotometers

Typically, rotometers are used to measure smaller flows and the reading is usually done locally, although transmission of the readings is possible. 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 are ideal for measuring the rate of liquids or gases which are being utilized for an application. Rotometers are equipped with a device called a “float” which rises and falls based upon the flow rate of the material. If the float is high then that means there is a greater force in the flow. These floats are engineered in different designs such as circular, triangular or elliptical. The float is housed in a special tube known as a tapered meeting tube. The diameter of a tapered tube gradually increases along the vertical axis of the device. Rotometers are crucial pieces of equipment when flow rate identification is essential.

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Rotometer Informational Video


Hoffer Provides Flow Solution to World-Class Scientific Institution Los Alamos Neutron Science Center

Los Alamos Neutron Science Center (LANSCE) is the major nuclear particle experimental facility at Los Alamos National Laboratory, underpinning the Laboratory as a world-class scientific institution. LANSCE pro¬vides the opportunity to perform experiments with low- to high-energy neutron sources and high-energy proton irradiations. As a desig¬nated Department of Energy national user fa¬cility, LANSCE hosts a considerable number of internal and external users, including large international collaborative research teams. Of utmost importance for many of the lab operations is the ability to provide adequate cooling capabilities given the amount of energy... Read More About This

Overcoming Ammonia Mass Flow Measurement & Control Challenges

Measuring or controlling ammonia flow can present challenges, and certain precautions should be taken to ensure accurate mass flow measurement and control. Sierra Instrument's Glen Coblentz shares tips on how to overcome these challenges as well as the precautions to take with ammonia mass flow measurement in this video from PITTCON.    ... Read More About This