Precision Industrial Fluid Measurement for Trade & Process Applications

Shop Macnaught Flow Meters for accurate industrial fluid measurement across fuel transfer, oil distribution, chemical dosing, manufacturing, process equipment, plant maintenance plus fluid-monitoring systems.

Macnaught’s industrial flow-meter platform centres on positive displacement oval gear technology, providing accurate measurement across both low-viscosity plus high-viscosity compatible liquids without requiring long straight pipe runs for flow conditioning.

The range includes MX-Series plus M-Series flow meters with digital displays, pulse outputs, specialised materials, multiple connection standards plus configurations for demanding industrial environments.

For broader measurement equipment used across trade maintenance, Testing & Measurement Tools provides a directly related pathway into workshop plus industrial testing equipment.

What Are Macnaught Flow Meters?

Macnaught Flow Meters are positive displacement measurement devices designed to measure the volume of compatible liquid passing through an industrial process or fluid-transfer system.

Macnaught uses precision-machined oval gears inside the meter body. As fluid passes through the measuring chamber, the gears rotate through known volumes, allowing the meter to calculate fluid quantity accurately.

Current Macnaught industrial flow-meter families include:

► MX-Series positive displacement flow meters
► M-Series positive displacement flow meters
► Digital-display flow meters
► Standard pulse-output meters
► Programmable register configurations
► Intrinsically safe configurations
► Flameproof configurations
► Mechanical-display configurations
► Aluminium-body meters
► Stainless-steel meters
► Fuel plus oil flow meters
► Chemical-process flow meters
► High-viscosity fluid meters

Macnaught currently specifies standard accuracy of approximately ±0.5% of reading across relevant MX-Series products, with selected configurations available at higher accuracy levels. Repeatability on relevant MX-Series meters is specified around ±0.03%.

For applications requiring broader equipment verification, Testing & Calibration Tools provides another relevant internal pathway.

Why Choose Macnaught Flow Meters?

Industrial fluid measurement needs more than a display showing litres.

Meter selection can influence measurement accuracy, process control, fluid accountability plus system reliability.

Macnaught’s oval-gear platform offers several practical advantages.

► High measurement accuracy – relevant models provide ±0.5% standard accuracy
► High repeatability – selected models specify approximately ±0.03%
► No flow conditioning required – oval-gear technology allows compact installation without long
straight pipe runs
► Wide viscosity capability – suitable configurations can measure both low-viscosity plus
high-viscosity liquids
► Compact installation footprint – useful where process-system space is restricted
Lications
► Multiple output types – digital displays, standard pulse outputs plus specialised registers are available
► Multiple process connections – BSP, NPT, DIN, JIS plus ANSI options are available across
selected ranges
► Broad flow coverage – Macnaught’s wider range extends from very low flow through to high-volume industrial transfer
► Australian manufacturing capability – Macnaught manufactures industrial flow meters in Australia

Macnaught states that its industrial flow-meter capability covers approximately 2LPH through to 2500LPM across sizes from roughly 1/4" through to 4".

For industrial teams monitoring rotating equipment alongside fluid systems, Vibration & Condition Monitoring Tools provides a relevant cross-sell.

Common Applications

Macnaught Flow Meters can support fluid measurement across industrial environments where transfer quantity, process flow or material accountability matters.

Common applications include:

► Fuel measurement
► Oil distribution
► Diesel transfer
► Lubricant monitoring
► Chemical dosing
► Chemical transfer
► Solvent measurement
► Biodiesel production
► Fuel additive blending
► Ethanol blending
► Manufacturing processes
► Industrial process control
► Fluid batching
► Transfer skids
► Tank filling
► Bulk fluid distribution
► Centrifugal oil systems
► Machinery lubrication systems
► Plant maintenance
► Production monitoring

The correct meter depends on the fluid plus process conditions.

A meter intended for fuel transfer can require a different body material, seal package, connection, flow range or output configuration from a meter measuring aggressive chemicals or high-temperature process liquids.

For industrial operations maintaining mechanical drives around process equipment, Power Transmission provides a useful supporting category.

Teams working around heavy process equipment can also read Quarry Crews Crusher Maintenance for practical industrial maintenance context.

Product Selection Guide

Selecting the correct Macnaught Flow Meter should begin with the fluid plus operating conditions rather than nominal pipe size alone.

1. Identify the fluid

Start with exactly what will pass through the meter.

Potential applications include:

► Lubricating oil
► Hydraulic oil
► Diesel
► Petrol-compatible applications where specified
► Kerosene
► Solvents
► Chemical liquids
► Additives
► High-viscosity process fluids
► Compatible industrial liquids

Fluid identity influences:

► Body material
► Seal material
► Gear material
► Temperature capability
► Pressure capability
► Required certification

Never assume two liquids with similar viscosity require the same meter construction.

2. Establish the required flow range

The operating flow needs to sit inside the meter’s specified measurement range.

Current MX-Series examples demonstrate the breadth available.

A 1" MX meter can cover approximately 6–120L/min.

A 2" configuration can cover approximately 15–500L/min.

A 3" model can cover approximately 20–733L/min.

A 4" configuration can reach approximately 120–1200L/min on relevant models.

Low-flow process meters can operate far below these ranges.

Choose around normal operating flow rather than maximum pipe capacity.

3. Match meter size to real process demand

Macnaught industrial flow meters span multiple connection sizes.

Typical options include:

► 1/4"
► 1/2"
► 3/4"
► 1"
► 1 1/2"
► 2"
► 3"
► 4"

Larger connection size doesn't automatically mean greater measurement quality.

The meter needs to suit:

► Expected flow
► Fluid viscosity
► Pipe size
► Pressure
► Temperature
► Installation space
► Process connection

Incorrect oversizing can move normal operating flow towards the lower edge of the meter range.

4. Choose aluminium or stainless steel

Body material should follow fluid compatibility plus operating conditions.

Aluminium flow meters can suit compatible:

► Fuels
► Oils
► Lubricants
► Selected process liquids

Stainless-steel flow meters can suit broader industrial-process applications where fluid compatibility or operating conditions require a more resistant material.

Macnaught currently offers relevant stainless-steel MX configurations using 316 stainless construction plus FEP-encapsulated seals.

Always verify compatibility for the exact fluid.

5. Select the required seal package

Seal material matters because seals remain in direct contact with the fluid.

Current Macnaught configurations include materials such as:

► FKM / Viton®
► FEP-encapsulated seals
The correct seal depends on:
► Fluid chemistry
► Temperature
► Pressure
► Cleaning procedures
► Process conditions

Don't choose seals from familiarity alone.

6. Choose the output format

Macnaught flow meters support multiple output styles.

Depending on model, options can include:

► Local digital display
► Mechanical display
► Standard pulse output
► Programmable register
► Remote pulse signal
► Intrinsically safe output configuration
► Flameproof configuration

Choose a local display where technicians need measurement directly at the meter.

Choose pulse output where data needs to feed compatible:

► PLC systems
► Batch controllers
► Remote displays
► Fluid-management systems
► Data-acquisition equipment
► Process-control systems

For wider electrical measurement around plant systems, Testing & Measurement Tools provides another useful pathway.

7. Check temperature requirements

Process temperature can strongly influence meter selection.

Current Macnaught examples include configurations rated around:

► 80°C
► 120°C
► 150°C
depending on body, seals plus meter design.

Select around the maximum realistic process temperature rather than average room conditions.

8. Confirm pressure requirements

Flow meters need to remain suitable for the system operating pressure.

Consider:

► Normal operating pressure
► Maximum pump pressure
► Pressure spikes
► Fluid viscosity
► Temperature
► Connection type
► System isolation
► Meter specification

High-pressure applications require explicitly rated equipment.

9. Match the process connection

Selected Macnaught MX meters are available with connection standards including:

► BSP
► NPT
► DIN
► JIS
► ANSI

Connection type needs to match the existing pipework plus installation standard.

Avoid unnecessary adaptor chains where the correct meter connection can be specified from the start.

10. Identify hazardous-area requirements

Some industrial applications involve environments where electrical equipment requires specialist protection.

Macnaught’s current MX range includes relevant configurations described as:

► Intrinsically safe – Ex ia
► Flameproof – Ex d

These products serve specialised applications.

Hazardous-area equipment selection should follow the site classification plus applicable engineering requirements.

Expert Tips for Industrial Flow Meter Selection

Reliable flow measurement begins before the meter reaches the pipe.

► Define the fluid first. Body plus seal compatibility depend on the actual process liquid.
► Use normal flow when sizing. Don't size only around maximum theoretical flow.
► Check viscosity range. High-viscosity liquids require suitable metering technology plus
operating range.
► Confirm minimum flow. Measurement performance matters at the low end of the process as
much as maximum capacity.
► Check process temperature. Fluid temperature can affect seals plus meter suitability.
► Match connections correctly. BSP, NPT, DIN, JIS plus ANSI shouldn't be treated as
Interchangeable.
► Choose outputs around the control system. Pulse output is valuable only when the receiving
equipment is compatible.
► Keep fluid clean. Foreign material can affect positive displacement meter internals.
► Install isolation where appropriate. Future servicing becomes easier when the meter can be
isolated correctly.
► Record meter configuration. Keep body, seals, connection, output plus model details
Accessible.
► Monitor unexpected measurement changes. Process variation can indicate meter, fluid or
system issues.
► Use appropriate calibration procedures. Measurement-critical applications should follow the required verification schedule.

Industrial Shed’s Trade Support Solutions provides a service pathway for businesses specifying equipment across larger industrial requirements.

MX-Series vs M-Series Flow Meters

Macnaught currently maintains two core positive displacement flow-meter families.

MX-Series

The MX-Series represents Macnaught’s newer modular platform.

Key characteristics include:

► Precision billet construction on relevant models
► Modular design
► Digital display options
► Pulse-output configurations
► M-Lock™ quick-release architecture
► Multiple material options
► Compact installation
► Industrial process flexibility

M-Series

The M-Series is Macnaught’s established original flow-meter platform.

Key characteristics include:

► Proven cast construction
► Mechanical display options
► Pulse-output configurations
► Long-standing industrial use

Both families use positive displacement measurement principles.

Selection should follow process requirements rather than assuming newer automatically means better.

How Oval Gear Flow Meters Work

An oval gear meter contains two precision gears inside a measurement chamber.

Fluid entering the meter causes the gears to rotate.

Each rotation corresponds to a known fluid volume.

The meter converts that gear movement into:

► Local quantity display
► Pulse signal
► Batch total
► Accumulated volume

depending on the selected output configuration.

Positive displacement measurement is particularly useful because it directly measures discrete fluid volumes rather than inferring flow from velocity.

That architecture contributes to strong performance across fluids with different viscosities.

Why Flow Conditioning Matters Less With Oval Gear Technology

Many flow technologies can require long straight pipe sections before or after the meter to stabilise the flow profile.

Macnaught specifically identifies no flow conditioning requirement as a benefit of its oval gear meters.

That can provide advantages where:

► Installation space is limited
► Pipe layouts are compact
► Skid systems are crowded
► Meter positioning needs flexibility
► Existing plant layouts can't easily provide long straight runs

Installation still needs to follow the exact Macnaught product instructions.

No flow conditioning doesn't mean installation orientation, filtration, pressure or connection requirements can be ignored.

Measuring High-Viscosity Fluids

High-viscosity fluids create challenges for many flow technologies.

Macnaught positions oval gear technology for measurement across a broad viscosity range.

Applications can include:

► Heavy oils
► Lubricants
► Additives
► Process liquids
► High-viscosity industrial fluids

As viscosity increases, system pressure loss plus available flow can change.

Meter selection should therefore consider both measurement capability plus the pump’s ability to move the fluid through the complete system.

A meter can be chemically compatible while still being poorly sized for actual operating flow.

Fuel & Oil Flow Measurement

Fuel plus oil represent major applications within the Macnaught MX range.

Current aluminium MX-Series models are available specifically for fuel plus oil measurement.

These can support applications such as:

► Diesel distribution
► Lubricant transfer
► Fuel monitoring
► Bulk oil measurement
► Fleet-fluid systems
► Industrial oil transfer
► Additive blending
► Production processes

For narrower workshop oil measurement at lower flow rates, the dedicated Macnaught Inline Meters collection should remain separate.

This Flow Meters collection should own industrial process measurement, particularly where pipe size, flow range, hazardous-area output or specialised process connections become relevant.

Chemical & Industrial Process Measurement

Macnaught also provides stainless-steel configurations for broader industrial-process applications.

Selected current stainless MX-Series products use:

► 316 stainless-steel bodies
► FEP-encapsulated seals
► High-temperature capability
► Multiple industrial process connections
► Digital plus pulse configurations

These can suit compatible chemical plus solvent measurement where the exact material compatibility has been confirmed.

Before specifying a meter for a chemical application, confirm:

► Chemical identity
► Concentration
► Temperature
► Pressure
► Viscosity
► Body material
► Seal material
► Cleaning fluid
► Process connection

For workshop teams handling chemical documentation, How to Read a Safety Data Sheet - A Quick Guide for Workshop Operators provides useful supporting guidance.

Pulse Output & Process Integration

A pulse-output flow meter converts measured volume into electrical pulses.

Those pulses can feed compatible external equipment such as:

► PLCs
► Batch controllers
► Remote totalisers
► Process-monitoring systems
► Fluid-management systems
► Data-acquisition equipment

Pulse configuration matters because the receiving equipment needs to interpret the signal correctly.

Check:

► Pulse type
► Pulse scaling
► Power requirements
► Wiring
► Input compatibility
► Hazardous-area requirements
► Cable requirements

before commissioning the system.

Flow Meter Accuracy, Repeatability & Calibration

Accuracy plus repeatability describe different aspects of measurement performance.

Accuracy describes how closely the measured quantity reflects the true quantity.

Repeatability describes how consistently the meter produces the same result under the same conditions.

Macnaught currently specifies approximately ±0.5% standard accuracy plus ±0.03% repeatability across relevant MX-Series products. Selected accuracy options can be tighter depending on configuration.

Where flow measurement supports commercial, regulatory or critical process decisions, calibration plus verification requirements should be established during system design.

Macnaught also identifies National Measurement Institute-certified flow-meter options within its broader Australian range.

Flow Meters vs Inline Oil Meters

These two categories should remain deliberately separated.

Choose Macnaught Flow Meters where the application involves:

► Industrial process measurement
► Larger pipe sizes
► Chemical transfer
► Specialised seals
► High temperatures
► High flow rates
► Pulse integration
► Hazardous-area requirements
► ANSI, DIN, JIS or industrial process connections

Choose Macnaught Inline Meters where the requirement centres on:

► Workshop oil measurement
► Compact lubrication systems
► BOP metering
► 1/2" or 3/4" oil lines
► Local oil dispensing
► Smaller workshop fluid systems

That distinction creates clearer purchasing pathways plus stronger SEO intent separation.

For teams managing plant measurement as part of a wider maintenance program, Calibration & Testing Tools provides another relevant cross-sell.

For broader maintenance preparation, Spring Jobsite Prep Getting Your Gear Ready provides additional trade-focused reading.