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Electromagnetic Flow Meter

Industrial and Municipal Mag Meter

FPI Mag flowmeter

The FPI Mag® Next Generation Mag Flow Meter from McCrometer. 0.5% accuracy, installs without cutting pipe, welding flanges, de-watering lines or interrupting service; dramatically reducing installation time and costs, including heavy equipment and added labor, by up to 45% over traditional full pipe flow meter installation.

A New Approach to Accurate Water Flow Measurement

Click here to learn more about this breakthrough technology. Or calculate your savings.

Electromagnetic Flow Meter

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Municipal and Industrial water and wastewater treatment systems present a challenging environment in which the accurate and reliable measurement of liquid flow is essential for cost-effective plant operation. In order for these systems to run as economically as possible, water and wastewater treatment facilities need a Flow Meter with accurate flow measurement necessary to ensure that limited water resources and treated wastewater effluent are processed efficiently.

The FPI Mag digital insertion water flow sensor supports the following water and wastewater treatment water flow applications:

Municipal Water & Wastewater

The FPI Mag meter supports the following water and wastewater treatment applications:


  • Distribution
  • Effluent
  • UV Dosing
  • Filter Balancing and Backwash
  • Wells & Booster Stations
  • Potable Water


  • Effluent
  • Recycle / Reclaim

Industrial Facilities

The FPI Mag is a suitable industrial meter for a variety of industrial facilities: power plants (including cogeneration), paper mills, chemical & petrochemical plants, metals & mining, food & beverage.

Applications include:

  • Cooling Water
  • Fire Water
  • Feed Water
  • Raw Water
  • Inlet to Surge Basin
  • Effluent


New Feature: The FPI Mag is now available in battery or solar powered options for forward flow sensors, enabling installation in remote applications without access to power. Additionaly, ask us about the new Smart Output feature, which allows the FPI Mag to connect to AMI / AMR systems through an encoded digital output.

Simple Installation

The insertion design of the FPI Mag allows for easy installation across a wide range of applications and pipe sizes. This hot tap flow meter allows you to insert the meter without interrupting service, de-watering lines, cutting pipe or welding flanges

Lower Costs

Customers save up to 45% on installation and the total cost of ownership. The FPI Mag eliminates the need for heavy equipment and manpower necessary during a typical full bore meter installation.

Unmatched Accuracy

The FPI Mag's multi-electrode design and unique operating principle delivers accuracy unmatched by other insertion meters and rivals the performance of full-bore mag meters.

Robust Construction

With no moving parts, there is nothing to wear or break. The sensor body is made from heavy-duty 316 stainless steel for maximum structural integrity. The sensor body is hermetically sealed and protected by NSF certified 3M fusion-bonded epoxy coating.


The FPI Mag is ideal for capital or maintenance projects, retrofits and sites never before metered. The unique combination of accuracy, ease of installation and total cost savings make the FPI magmeter the perfect choice for a wide range of Municipal and Industrial Applications.

The FPI Mag has no moving parts and a single-piece design. The Multi-electrode water flow sensor contains nothing to wear or break and is generally immune to clogging by sand, grit or other debris. The FPI Mag is available with forward-flow only or bi-directional measurement for line sizes from 4 to 138 inches and the system now includes a brass full port ball valve with stainless steel nipple, the quick connect cable fitting, our new M-Series converter and wrenches necessary for installation.

The FPI Mag flow meter is a versatile Insertion Mag Meter which is an affordable alternative to full-bore meters and ultrasonic flow meters. This unique, patented hot tap flow meter is an excellent choice when your project needs measurement on any one or more of the following:

  • Filter Balancing and Backwash
  • Pumping Station Flow Meter
  • Wells & Booster Stations
  • Waste Water Influent
  • Drinking Water
  • PC Water Cooling
  • UV Dosing
  • Non-Revenue Water


Rivals the performance of a full bore mag! Click to download the 3rd party testing accuracy White Paper HERE.
Multi-electrode design delivers accurate, full profile measurement with repeatable results.

Method: Electromagnetic


The following specifications will help determine if the FPI Mag is suited for your specific flow measurement application.

Range: 0.3 ft/s to 32 ft/s - for large line sizes, please consult the configuration sheet 
Accuracy: ± 0.5% from 1 ft/s to 32 ft/s - per velocity limits
± 1%: when using the battery powered converter
Linearity: 0.3% of reading 
Pipe Sizes: 4" - 138" (100 mm to 3,500 mm) 
Materials: 316 Stainless Steel Sensor Body, Insertion Hardware and Sensor Electrodes NSF Certified 3M Fusion-Bonded Epoxy Coating



Literature Videos Case Studies
FPI Mag Brochure Installation Video Tight Installation Case Study
Spec Sheet Non-Revenue Water Video Case Study City of Geneva Case Study
Data Sheet: Product Demo Power Plant Cooling Water Case Study
Configuration Sheet Product Manager Nick Voss Davidson Water Case Study

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McCrometer introduces the Next Generation apps!

FPI Cost Calculator

FPI Mag Cost Calculator

Ideal for calculating FPI Mag cost savings on the web!

Please click below to navigate to the cost calculator on the web.

FPI Cost Calculator on the WEB


CSA, UL, ISO Certifications and Approvals:
McCrometer CSA Certification   Listed by CSA to 61010-1: Certified by CSA to UL 61010-1 and CSA C22.2  No. 61010-1-04
McCromter Ultra Mag ISO Certification   ISO 9001:2008 certified quality management system

FPI Mag Electromagnetic Flow Meter White Paper on Accuracy  

Multi-electrode design delivers 0.5% accurate, full profile measurement with repeatable results.

3rd Party Testing verifying the accuracy of the FPI Mag.

Click Here to Read the WATER FLOW METER accuracy paper.

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