Flow Meters & Gauging.

Discover precision and reliability with our collection of flow meters and gauges. From diesel oil and diesel tank flow meters to versatile water tank gauges and tank flow meters, we’ve got the right solution for accurate measurement and monitoring. Designed for efficiency and ease of use, these tools help businesses keep operations integrated while reducing waste. Whether you're gauging water levels or managing fuel use, find the right fit for your needs here today.

FAQs

Common questions answered.

Five of the questions we hear most often on carpark and street linemarking gear. Full knowledge base on our FAQ page.

  • What is a flow meter?

    A flow meter measures the volume of liquid passing through a pipe or hose. Industrial flow meters are calibrated in litres per minute (lpm) and report either as a running total on a mechanical drum, a digital LCD readout, or as a pulse signal to a remote totaliser. They sit inline between a fuel pump and a dispense nozzle, between a tank outlet and a process line, or as part of a meter-and-pump bowser unit. The meter's job is to count what was dispensed; what you do with that number (display, log, invoice, sub-meter) is what determines the readout type you choose.

  • How is a tank gauge different from a flow meter?

    A tank gauge measures how much liquid is currently sitting in a tank: the volume in storage, like the dipstick reading on a fuel cap. A flow meter measures liquid moving through a pipe: the volume per minute or the cumulative volume since the last reset. Tank gauges sit on the tank (mechanical float, ultrasonic, or hydrostatic pressure sensor; the FOZMULA GLL28, GRACO Pulse Tank Level Monitor, OLE T5020/Z5020 and PIUSI OCIO ranges are common Australian options). Flow meters sit in the line (PIUSI K-series, Macnaught Digital Diesel, Fill-Rite TT and 900 series). Most operators use both: a gauge to know what is in stock, a meter to count what was dispensed.

  • Can flow meters be used with diesel?

    Yes, with the right material spec. Standard PIUSI K-series meters, Macnaught mechanical and digital meters, Fill-Rite TT and 900 series, GPI M30, and Adam by Piusi mechanicals all run diesel without modification. The internals are aluminium or cast iron with diesel-rated seals. Avoid running petrol or AdBlue through a diesel-rated meter without checking the spec sheet: petrol needs ATEX/IECEx certification, AdBlue needs stainless steel and Viton.

  • Are tank gauges accurate?

    Mechanical float gauges (FOZMULA GLL28, ROCHESTER 6583) are accurate to roughly 5-10% of full scale, fine for stock-on-hand decisions but not for fiscal sale. Electronic gauges with hydrostatic or capacitance probes (PIUSI OCIO, OLE T5020/Z5020/C2020, FRANKLIN EVO 200, GRACO Pulse TLM) deliver 1-2% accuracy and can output a 4-20 mA signal to a PLC. For fiscal-grade dispensing accuracy, use an NMI-pattern-approved bowser meter, not a tank gauge. Water tank gauging is a separate product family from these fuel and oil gauges; ask if you need a water-specific recommendation.

  • Do I need a digital or mechanical meter?

    Mechanical wins on simplicity and longevity. No batteries, no electronics, decades of service with a seal kit replacement once or twice. Use a mechanical meter for stand-alone refuel points where a person reads the drum and writes it down. Digital wins on usability and integration. Battery-powered LCD with batch reset, large display, often a pulse output to a fuel-management system. Use digital where operators batch-dispense to multiple vehicles, where you want a totaliser the operator does not have to write down, or where the meter feeds telemetry. Pulse-only meters (no display) are the choice when the meter is wired into an iFUEL, BlueBOXX, or similar fluid-management system that does the totalising centrally.

Full guide

Choosing the Right Flow Meter or Tank Gauge

Flow meters and tank gauges measure liquid in two different states. A flow meter counts the litres passing through a pipe (in motion). A tank gauge tells you how much liquid is sitting in a tank (at rest). Most fuel and lubricant operations need both: the meter for dispensing accountability, the gauge for stock-on-hand.

Flow meters by fluid. Diesel, petrol, lubricants, AdBlue and water each demand a different internal material. Diesel and oil run on standard cast or aluminium meters. Petrol needs an ATEX or IECEx-certified meter (PIUSI K33 ATEX, K24 ATEX, Adam by Piusi K150 ATEX). AdBlue (DEF) needs stainless internals and Viton seals (PIUSI Turbinox K24 AdBlue, Macnaught Digital UREA/DEF, PIUSI AdBlue K24 pulse). Running a diesel meter on AdBlue corrodes the brass and falsifies the reading.

Flow range and port size. PIUSI K200 HP starts at 1/8 inch BSP for fine measurement. Mid-range workshop meters (PIUSI K24, K33, K44, Adam by Piusi mechanical) cover 7-120 lpm on 1 inch ports. Higher-flow lubricant and bulk-transfer applications run on PIUSI K600/3 (1 inch BSP), K700 (2 inch BSP, 20-220 lpm), and K900 3 inch BSP. Match meter port size to the line ID at the install point: oversizing reduces accuracy, undersizing chokes flow.

Tank gauges. A tank gauge tells you how much fluid is currently in storage. Mechanical contents gauges (FOZMULA GLL28, FOZMULA Vertical Spiral, ROCHESTER 6583) use a float linked to a dial, with no power requirement and decades of service life. Electronic tank gauges with probe (PIUSI OCIO, OLE T5020/Z5020/C2020 with probes for tanks up to 3 m, FRANKLIN EVO 200 for tanks up to 2 m, GRACO Pulse Tank Level Monitor) measure level with a hydrostatic or capacitance sensor and report on a digital display, with optional 4-20 mA output to a PLC or fluid management system. Level switches (FOZMULA S285/S286, BANLAW FillSafe overfill protection) trigger an alarm or pump cut-out at high or low setpoints.

Mechanical, electronic, or pulse output. Mechanical meters (PIUSI K33, K44, Macnaught Lubemate, Fill-Rite 800/900) show the litre count on a rolling drum. They need no power, run forever with a seal kit replacement, and are the choice for stand-alone refuel points. Electronic meters (PIUSI K24 Digital, Macnaught Digital Diesel, Graco IM20) add a battery-powered LCD with batch reset, totaliser, and unit selection. Pulse-output meters (PIUSI K200/K400/K600/K700/K900 pulse, Macnaught Pulse) emit pulses to a remote PLC, fluid management system, or telemetry box for centralised reconciliation.

Approval. If the meter is being used to invoice on the litres dispensed (fiscal-grade billing or sub-metering for cost recovery), it has to be NMI pattern-approved and recalibrated annually by a certified technician. Most meters listed here are technical-grade, not NMI fiscal-grade: for fiscal use see the bowser and dispenser units that ship with NMI-approved metering.

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