The FPI Mag meter from McCrometer saves on installation costs

Learn about the innovative FPI Mag from McCrometer, a hot tap mag meter that saves installation costs by eliminating the need for trenches. With 0.5% accuracy, it's a Build America Buy America-compliant solution for flow measurement.
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June 11, 2025
2 min read
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The FPI Mag from Hach's Flow Solutions by McCrometer is a hot tap, full profile insertion mag meter for pipes ranging from 4-inches to 138-inches in diameter.

"Instead of an insertion meter like a normal mage meter where you have all your electrodes inside the pipe, you don't have to cut out the pipe," said Corey Christensen, McCrometer regional sales manager. "You can just hot tap this in. It's a 2-inch hot tap."

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The FPI Mag is a Build America Buy America-compliant mag meter that uses Faraday's law of electromgnetic induction to measure flow. Running the length of meter on the inside of pipe are electromagnetic coils that produce magnetic fields. As water moves through those magnetic fields it produces voltage that is directly proportional to the velocity of the conductor.

The voltage produced by the water is collected from stainless steel eletrode pairs running along the outside of the entire sensor, and that voltage is then transmitted to electronics that convert the voltage to flow velocity. By multiplying the average flow velocity by the cross-sectional area of the pipe, the device can provide a volumetric flow rate.

Since the FPI Mag can be hot-tapped, it saves costs for utilities as trenches are not required for installation. Instead, the unit can be installed directly into the top of the pipe without the need to use heavy equipment such as cranes, nor is the manpower necessary to use that heavy equipment needed for installation.

Accuracy is 0.5% from 1 ft/s to 32 ft/s, and 1% from 0.3 ft/s to 1 ft/s. The epoxy seal is is NSF-certified and lifetime guaranteed.

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Bob Crossen

Editorial Director

Bob Crossen is the editorial director for WaterWorld Magazine, Wastewater Digest, Stormwater Solutions, and Water Quality Products, which compose the Endeavor Business Media Water Group. Crossen graduated from Illinois State University in Dec. 2011 with a Bachelor of Arts in German and a Bachelor of Arts in Journalism. He has worked in business-to-business journalism covering the drinking water, wastewater, stormwater and point-of-use/point-of-entry markets since April or 2016. Crossen can be reached at [email protected] or 847.954.7980.

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