Trusted by top industrial facilities worldwide

Precision Flow Measurement for the World's Most Demanding Hazardous Environments

Global Hazardous Area Approvals for Explosion Proof, Intrinsically Safe, and Simple Apparatus applications.

Industry-Leading Accuracy & Repeatability with no flow conditioning required—delivering reliable performance every time.

Trusted Since 1964, Macnaught has set the global standard in Oval Gear Flow Meter technology for clean process fluid applications.
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FLOW METER HOTLINE(813) 896-2710
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MACNAUGHT HAZARD AREA FLOW METER PORTFOLIO

FlameProof

Macnaught Flame Proof (ExD) Flow Meter

Macnaught's ExD C1D1 flow meter is built off the legendary MX flow meter assembled to a ExD Flameproof Class 1 Division 1 sensor approved with all major certifications FM-US, FM-CA, ATEX and IECEx.

• Flow Ranges from .13 GPH to 600+ GPM in sizes 1/4" thru 4"
• Pulse output is NPN type
• Temperature ranges from -56F to 284F 
• .5% volumetric accuracy with .03% repeatability
• ExD Meters, displays and Flow Computers in stock
• 3 Meter cable
• Large stock of ExD displays on hand
 

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Intrinsically-Safe23

Macnaught Intrinsically Safe ( Ex ia ) Flowmeter

Macnaught's Ex ia Intrinsically Safe flow meter meets all major C1D1 approvals and certifications and supersede C1D2 requirements with FM-US, FM-CA, ATEX and IECEx.

• Flow Ranges from .13 GPH to 600+ GPM in sizes 1/4" thru 4"
• Stocked output is a Proximity Sensor with Namur connection and 15 meter cable
• Temperature range -13F to 158F
• Optional Omni Polar NPN sensor available
• Safety Barrier provide by others. Entity Parameters to size Barrier: Ui = 20v li= 60mA Pi = 200mW Ci = 150nF Li = 150uH
• I.S Displays in stock
 

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SimpleSafe

Macnaught Simple Safe ( Ex ia ) Flowmeter

Macnaught's latest Hazard offering allows for non powered Hazard Meter application. Perfect for remote locations or areas where power is not available. Our MX Meter is mated with our Simple Apparatus PCB and meets all Global Intrinsically Safe areas.

• PCB is completely passive and adds no energy to connected circuits
• Rate and total only option is completely non powered
• Batch and output versions require power and a Safety Barrier ( provided by others ) see instructions for entity parameters
• Temperature ranges -40F to 158F
• Rate & total is Std Display, Batch and Relay options available

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Mechanical24

Macnaught Mechanical Register Flow Meters

Macnaught's long standing Mechanical Register Industrial Flometer range allows for non powered hazard measurement applications. Easy for operators to reset and record values.

• 1% Volumetric Accuracy 
• Heavy Duty Industrial Grade Build
• Flow Direction dependent 
• Well suited for no power hazard fluid measurement options
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Explosion Proof Flow Meters
Intrinsically Safe Flow Meters
Simple Safe Flow Meters
Mechanical Register Flow Meters
Macnaught is the largest global provider of Positive Displacement Oval Gear Flow Meters and has been since 1964.
Macnaught is the largest global provider of Positive Displacement Oval Gear Flow Meters and has been since 1964.
. SUPERIOR QUALITY SINCE 1964
ABOUT MACNAUGHT

Largest global provider of Positive Displacement Oval Gear Flow Meters

All Macnaught Hazard Meters come with No Flow Conditioning, no upstream or downstream lengths of straight run pipe - put the meter where you need it.

• All Sensors are inscribed with detailed approval markings
• Stainless Steel or Aluminum Body Options
• FEP Body Seals and 316SS, PEEK or Aluminum Rotors
• .5% Volumetric Accuracy with .03% Repeatability
• Compact footprint, easy to install
• 2 Year Warranty

We carry a large inventory of stocked meters in sizes ¼” thru 4” with flow ranges as low as .13 Gallons per Hour to 317 Gallons per Minute. Non-stock meters can ship in 5-14 business days. All Flow Meters are tested with an individual calibration certificate along with K-Factor. Macnaught USA can process Flow Meter quotes within the hour with supporting documentation for USA, Canada, Mexico, Central America, South America and the Caribbean.
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Consult with our Flow Meter Specialists

Our technical staff has decades of PD Meter applications engineering experience and can assist with Flow Meter selection, specification and installation guidance.

Contact our Flow Meter Specialist

Fill out the form below and our flow meter team will get back to you with urgency.
Key Oval Gear Benefits

Macnaught Oval Gear Flow Meter Advantages

no-flow-conditioning

No Flow Conditioning

Put the meter where you need it: Off Valves & Pumps, U Bends. Perfect for tight installations.
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Accuracy

.5% Accurate of Reading with .03% Repeatability ( .1% accurate available in select models )
lowpressuredrops

Low Pressure Drops

Most fuel applications are less than 2psi
robustdesign

Robust Design

Built for demanding Industrial applications. MX meters machined from solid billet.
Macnaught FCM (fuel consumption) High Accuracy Diesel Fuel Flow Meters

Macnaught MX Series ExD Flow Meter General Overview

Macnaught USA is pleased to announce our long awaited Explosion Proof / Flame Proof Oval Gear Flow Meter product line. Built on the legendary MX Series platform – accuracy remains at .5% of reading and .03% repeatability.

Macnaught’s Oval Gear portfolio includes:
  • M Series Mechanical Register
  • M Series HP High Pressure Meters
  • M Series CR Series PPS MOC for aggressive chemistries
  • MX Series Pulse / Display / Display w 4-20mA / Remote Display with Modbus & Hart
  • MX IS Series Intrinsically Safe in Namur & NPN outputs
  • MX ExD FM / ATEX-IECex NPN output

Consult with our Flow Meter Specialists

Book a meeting
CALL US(813) 896-2710