► Macnaught | Inline Meters

Accurate Oil Measurement for Trade & Industrial Applications

Shop Macnaught Inline Meters for accurate oil measurement, workshop fluid monitoring & controlled lubricant transfer across Australian automotive workshops, fleet facilities, machinery servicing, agricultural maintenance & industrial fluid-handling systems.

Macnaught’s current oil-meter range covers mechanical inline meters, electronic inline meters, pulse-output meters & BOP inline meters for compatible lubricating oils plus selected workshop fluids.

Depending on the model, Macnaught inline meters can support engine oil, gear oil, hydraulic oil, ATF, coolant, diesel & kerosene, with different flow ranges, BSP connections, pressure ratings & output formats available.

Correct selection starts with the fluid, expected flow rate, operating pressure, connection size, required display or pulse output & wider pump-system configuration.

For workshops building complete oil-delivery systems, Macnaught Control Guns provides a relevant pathway into controlled dispensing equipment.

What Are Macnaught Inline Meters?

Macnaught Inline Meters are fluid-measurement devices installed within compatible oil or fluid-transfer systems to measure the volume passing through the line.

Unlike a control gun with an integrated meter, an inline meter can sit independently within the transfer path.

Macnaught’s current Oil Meter range includes:

► BOP inline meters
► Mechanical oil inline meters
► Electronic 1/2" inline meters
► Electronic 3/4" inline meters
► Pulse-output 1/2" meters
► Pulse-output 3/4" meters
► Batch total displays
► Cumulative total displays
► Resettable totalisers
► Non-resettable totalisers
► Pulse-output configurations for connection to compatible external devices

These options allow a workshop to select between local visual measurement & remote pulse-based monitoring.

Macnaught uses oval-gear metering technology across relevant oil-meter products, providing accurate positive-displacement measurement for compatible fluids.

For broader measurement equipment used around machinery servicing, Testing & Measurement Tools provides another directly related pathway.

Why Choose Macnaught Inline Meters?

Fluid transfer becomes easier to manage when the workshop can measure how much lubricant passes through the system.

A correctly specified inline meter can improve quantity visibility without forcing the meter to sit directly inside the dispensing gun.

► Accurate fluid measurement – selected models provide stated accuracy around ±0.5%
► Mechanical options – useful where a battery-free visual register is preferred
► Electronic displays – provide clear batch plus accumulated quantity information
► Pulse-output meters – allow compatible external devices to receive meter pulses
► Multiple flow ranges – different products suit lower-flow plus higher-flow systems
► 1/2" plus 3/4" BSP options – supports different workshop line configurations
► High-pressure capability – selected models are rated up to 1,500psi
► Wide fluid compatibility – selected meters handle oils up to SAE 140 plus other compatible fluids
► Flexible installation – inline format allows the meter to be positioned within the fluid path rather than only at the gun

The best meter is the one sized around the actual flow plus fluid system.

Installing a larger meter doesn’t automatically improve accuracy or system performance.

Common Applications

Macnaught Inline Meters suit trade environments where lubricant or compatible fluid volume needs to be measured during transfer.

Common applications include:

► Automotive workshops
► Fleet servicing
► Truck workshops
► Agricultural machinery
► Earthmoving equipment
► Construction plant
► Industrial machinery
► Manufacturing facilities
► Engine oil dispensing
► Gear oil transfer
► Hydraulic oil systems
► ATF dispensing
► Coolant transfer
► Diesel transfer where model compatibility permits
► Kerosene transfer where model compatibility permits
► Bulk oil distribution
► Workshop oil rooms
► Pumped lubrication systems
► Mobile oil-transfer equipment
► Fluid-accountability systems

The meter should be matched to the pump, fluid, hose, flow range & connection size used in the application.

For machinery-maintenance operations where lubricant condition forms part of a broader maintenance strategy, Vibration & Condition Monitoring Tools provides a relevant cross-sell.

Product Selection Guide

Choosing the right Macnaught Inline Meter starts with the transfer system rather than the display type.

1. Identify the fluid

Confirm exactly what will pass through the meter.

Depending on the model, Macnaught inline meters can be compatible with:

► Engine oil
► Gear oil
► Hydraulic oil
► ATF
► Coolant
► Diesel
► Kerosene
► Other specifically approved fluids

Never assume that every inline meter supports every fluid.

Check the individual meter specification before installation.

2. Determine the expected flow range

A meter performs best when the actual operating flow sits within its specified range.

Current Macnaught examples include:

► IM012P-01 pulse meter – approximately 1–30LPM
► IM019E-01 electronic meter – approximately 3–80LPM

Different models suit different workshop flow requirements.

Consider:

► Pump output
► Hose diameter
► Hose length
► Oil viscosity
► Filter restriction
► Dispensing equipment
► Typical transfer volume

A meter sized far above the real flow may not be the best choice.

3. Choose 1/2" or 3/4" connection size

Macnaught’s current oil-meter range includes both 1/2" BSP(F) & 3/4" BSP(F) configurations.

Connection size should follow the existing fluid system.

Check:

► Pump outlet
► Hose diameter
► Pipe size
► Fitting type
► BSP connection
► Flow requirement

Avoid unnecessary reducers if the system can be configured correctly from the start.

4. Choose mechanical or electronic display

A mechanical inline meter can suit:

► Battery-free measurement
► Straightforward workshop dispensing
► Applications where a mechanical register is preferred
► Mobile servicing environments

A digital electronic meter can suit:

► Clear batch measurement
► Cumulative totals
► Higher-volume workshop tracking
► Applications needing easier quantity visibility

Macnaught’s mechanical meter uses an oval-gear system with a six-digit totaliser plus resettable batch display.

5. Choose a pulse-output meter where remote monitoring is required

Pulse meters differ from standard local-display meters.

They output a pulse signal to compatible external equipment.

This can support:

► Remote totalisation
► Workshop management systems
► Fluid-management controllers
► External displays
► Data collection systems

Macnaught’s IM012P-01 provides pulse output with a 1m fly lead for compatible connection to external devices.

Use pulse-output equipment only where the receiving system is suitable.

6. Check pressure rating

The meter must remain within the pressure of the fluid system.

Current Macnaught examples include:

► IM012P-01 – maximum pressure approximately 1,000psi
► IM019E-01 – maximum pressure approximately 1,500psi

Check:

► Pump pressure
► Hose pressure rating
► Meter pressure rating
► Control-gun rating
► Nozzle rating
► Fittings

The complete system must remain compatible.

7. Check viscosity compatibility

Macnaught’s current inline oil meters include models suitable for oils up to SAE 140.

Higher-viscosity fluids can reduce practical flow.

Consider:

► Oil grade
► Operating temperature
► Pump capability
► Flow requirement
► Meter range
► Hose restriction

A meter rated for the fluid still needs to be sized around the expected flow.

8. Decide whether BOP-specific metering is required

Macnaught also offers the IM012EB-01 BOP Inline Meter for the Battery Operated Pump platform.

That meter is designed to fit compatible BOP dispensing guns while providing accurate volume measurement.

Current BOP meter features include:

► Up to 10LPM flow
► Backlit display
► 360° meter rotation
► IP65 rating
► Metric plus imperial display options
► Engine oil compatibility
► Gear oil compatibility
► ATF compatibility
► Automotive coolant compatibility

Where the meter is specifically being paired with the BOP system, use the dedicated BOP product rather than a generic inline meter.

For battery-powered fluid transfer, Macnaught MPL Battery Operated Pump provides the relevant system pathway.

Expert Tips for Inline Oil Meter Installation

Accurate measurement depends on correct meter selection plus installation.

► Match the meter to actual flow. Don’t select from port size alone.
► Confirm fluid compatibility. Check oil type, viscosity plus other approved fluids.
► Keep the meter clean. Contamination can affect internal metering components.
► Use correct BSP fittings. Avoid forcing mismatched threads.
► Check flow direction. Install according to the product instructions.
► Avoid unnecessary restrictions. Undersized upstream or downstream fittings can affect
system performance.
► Inspect for leakage. Any fluid loss around fittings can affect both workshop cleanliness plus delivered quantity.
► Check meter readings periodically. Investigate abnormal totals or inconsistent performance.
► Protect electronic displays. Follow the specific product requirements around cleaning plus operating environment.
► Check pulse wiring. Pulse-output meters need secure compatible electrical connections.
► Keep fluid systems identified. Accurate metering is useless if the wrong lubricant is being measured.
► Record meter model plus product code. This makes future servicing or replacement easier.

For workshops maintaining frequently used fluid-handling equipment, Tool Maintenance Kit provides a relevant supporting category.

Industrial Shed’s Tool & Equipment Care also provides a service pathway for regularly used trade equipment.

Mechanical vs Electronic Inline Oil Meters

Both measure fluid volume but they suit different workshop requirements.

Mechanical Inline Meters

Can suit:

► Battery-free operation
► Straightforward local measurement
► Mobile equipment
► Workshop oil transfer
► Mechanical totalisation

Macnaught’s mechanical oil inline meter provides a six-digit totaliser plus resettable batch measurement.

Electronic Inline Meters

Can suit:

► Digital quantity display
► Batch totals
► Accumulated totals
► Larger flow ranges
► Easier local reading

Macnaught’s IM019E-01 provides a 3–80LPM flow range plus ±0.5% stated accuracy.

Neither type is automatically superior.

Choose according to operating environment plus measurement requirements.

Pulse Meters for Remote Fluid Monitoring

Pulse-output meters are useful where the volume data needs to leave the meter.

Instead of relying only on a local display, the meter outputs a pulse signal corresponding to fluid movement.

This can support compatible:

► Oil-management systems
► Remote displays
► Workshop monitoring systems
► Controllers
► External totalisers

Macnaught’s IM012P-01 uses a pulse-only configuration with a 1/2" BSP(F) connection plus flow range up to approximately 30LPM.

A pulse meter should be selected around both the hydraulic system plus the electronics receiving the signal.

The plumbing can be correct while the monitoring system remains incompatible.

1/2" vs 3/4" Inline Meters

Port size influences which fluid systems a meter fits most naturally.

1/2" inline meters can suit:

► Lower to medium workshop flow
► Compact oil systems
► Control-gun supply lines
► Smaller hose configurations

3/4" inline meters can suit:
► Higher-flow oil systems
► Larger dispensing lines
► Industrial oil transfer
► Higher-volume workshop distribution

The 3/4" IM019E-01 supports flows up to 80LPM while Macnaught’s 1/2" pulse meter example supports up to 30LPM.

This doesn’t mean every 3/4" application needs 80LPM.

Size the meter around actual flow plus existing line dimensions.

Inline Meters vs Metered Control Guns

Both measure oil but they sit in different places within the system.

An inline meter can be installed independently within the fluid line.

A metered control gun combines measurement plus dispensing control in the technician’s hand.

Choose an inline meter where:

► Measurement is needed upstream
► Multiple dispensing points share a line
► Remote monitoring is required
► A standalone meter suits the installation

Choose a metered control gun where:

► The technician needs quantity feedback at the fill point
► Dispensing plus measurement need to remain together
► Mobile hose-end servicing is the priority

Some systems can use both depending on their fluid-management requirements.

For hose-end measured dispensing, Macnaught Control Guns provides the more focused pathway.

Inline Meters Within a Complete Oil System

A typical measured oil-distribution system can look like:

Bulk oil storage → pump → filter → hose reel → inline meter → hose → control gun → machine

The meter measures one part of the transfer process but accuracy still depends on the wider system operating correctly.

Potential causes of poor measurement or flow can include:

► Incorrect meter sizing
► Air in the fluid system
► Fluid contamination
► Excessive viscosity
► Blocked filters
► Pump limitations
► Hose restrictions
► Incorrect fittings
► Meter wear

Diagnose the full system before assuming the meter itself is the only problem.

For broader machinery-maintenance requirements, Power Transmission provides another relevant cross-sell.

Measurement Accuracy & Workshop Oil Accountability

Accurate fluid measurement can support stronger workshop oil-management practices.

Macnaught’s current inline oil-meter products specify accuracy around ±0.5% of reading on relevant models.

That can support:

► Fleet lubricant tracking
► Workshop consumption monitoring
► Machinery servicing
► Repeated known-volume transfers
► Bulk oil management
► Job-level oil accountability

The meter confirms fluid quantity.

It does not confirm:

► Correct oil selection
► Correct machine capacity
► Final oil level
► Lubricant condition
► Correct service procedure

Technicians should still follow the machinery manufacturer’s servicing requirements.

For practical workshop context around equipment selection plus servicing processes, The Apprentice's First Tool Kit: What You Actually Need provides relevant supporting reading.