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Flow Indicators

A reliable source for Flowmeter information and leading Flowmeter Companies & Manufacturers.

Flow Indicators

Flow indicators allow an operator to view the liquid as it moves through the pipes. 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.

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 of mechanical impact may be a threat. Read More…Request for Quote

Flow Indicators Flow indicators allow an operator to view the liquid as it moves through the pipes. 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.
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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. $$$

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 SIKA USA Alicat Scientific, Inc. Keyence Corporation of America Eastern Instruments

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 liquid is part of an important process and needs 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