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Flow Indicators

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These simple but important flow meters are often called sight flow indicators and are components of industrial process lines that require an instant and inside look of the flow inside the pipe. Unlike ultrasonic flow meters or vortex flow meters, flow indicators do not take calculations or measurements regarding mass or speed. Read More…

Flow Indicators Flow indicators allow an operator to view the liquid as it moves through parts of a system.
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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 $$$

El Monte, CA  |  800-800-3569

Sparling Instruments designs and manufactures fluid flow measuring products used for measuring the flow of liquids in many industries including water production and distribution, wastewater treatment, water remediation, and a myriad of industrial and commercial applications.

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Sparling Instruments, LLC $$$

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 $$$

Andover, MA  |  978-645-5500

The MKS family of flow delivery products includes flow meters, mass flow controllers, in-situ mass flow verifiers, and flow ratio controllers. Enabling our customers to bring their products and processes to market faster, more reliably, and more cost effectively is at the heart of our flow measurement and control product design philosophy.

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MKS Instruments, Inc. $$$
placeholder image Sierra Instruments SIKA USA Sparling Instruments, LLC Burkert Fluid Control Systems MKS Instruments, Inc.

Flow indicators are the type of flow meters that monitor fluid clarity, level, and color through a glass or plastic observation window of varying size. The window can be horizontally or vertically oriented. The body of the flow indicator may be plastic or metal. Double windows held in position by a metal housing and gaskets are used in applications where high-pressure, corrosion, or mechanical impact may be a threat.

Rotator Sight Flow Indicator Flow Indicators - John C. Ernst Co., Inc.

Flow indicators are attached to the piping system by threaded, flanged, or butt-welded connection, all of which must be waterproof. For low visibility, flow indicators may contain lights. Visual indicators such as flappers or propellers indicate the direction of the stream although the material type may interfere with such accessories. Flow indicators are used mostly in industrial and manufacturing applications where flowing liquids are part of an important process and need to be monitored.

There are various types of flowmeters and flow indicators that are used depending on the type of liquid and what is being monitored.

Plain sight indicators are the simplest option, containing only an observation window. No moving parts are used, and this type is only for easily visible fluids.

Visual indicators use floating balls, flappers, and propellers. The floating balls indicate the liquid level in hard-to-see applications as an alternative to lights. Flappers are used when the flow of the liquid could be going in two different ways. It lets the observer know the flow direction. Propellers are used for clear or transparent liquids to determine whether or not they are flowing.

Another kind of flow indicator is a drip tube where the liquid drips into the tube in systems with a downward flow.

Some flow indicators have a self-cleaning mechanism consisting of a rotor and wiper. When the observation window is twisted, wipers inside the pipe clean the plastic or glass viewing area to allow for an unobstructed view. The interfering materials on the window are wiped off and carried away with the stream. This method does not require any downtime and is often necessary when the pipes contain suspended solids, slurries or highly viscous materials.

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