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Flow Indicators

A reliable source for Flow Meter information and leading Flow Meter Companies & Manufacturers.

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

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 $$$

Concord, CA  |  925-687-8363

At RCM Industries, our flow meters are designed to improve productivity, reduce cost, and protect the most sensitive equipment and processes. All flow meters are suitable for measuring water, oil, and most low viscosity liquids, and are available in Monel, stainless steel, and bronze alloys. Since our founding in 1972, we have served industries ranging from pharmaceutical to chemical to food and beverage. No matter what your application, we aim to exceed your expectations.

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RCM Industries, Inc. $$$

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 $$$

Huntington Beach, CA  |  714-893-8529

Blue-White Industries specializes in providing high-quality flowmeters, water flow meters, air flowmeters and ultrasonic flow meters. Our extensive line of flowmeters is sure to meet any requirement you may have. We are committed to ensuring that our customers succeed with our products. For more information, please call or visit our website today!

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Blue-White Industries, Ltd. $$$

Evanston, IL  |  800-553-0550

Our flow meters are made from the highest quality materials. We work hard to ensure we use the best materials because we know how important flow regulation is for safety and the effectiveness of your business processes. We work hard to exceed all regulations and requirements for flow meter design, so you never have to worry about the compliance of your supplies. Contact us for more info!

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ERDCO Engineering Corporation $$$

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 $$$
placeholder image HydraCheck RCM Industries, Inc. Sierra Instruments Blue-White Industries, Ltd. ERDCO Engineering Corporation SIKA USA

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.

Flow Indicator Informational Video