1

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.

Recently Viewed Products

What's the GO?

Frequently Asked Questions

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.

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.

Related categories: Fuel Pumps · Bowsers and Dispensing · Hoses, Hose Reels and Fittings

4.9/5 Stars

Thousands of Happy GOers

Read All Reviews

4.9/5 Stars

Thousands of Happy GOers

Read All Reviews

4.9/5 Stars

Based on 20,000+ Orders
Fluid Handling Equipment
They Deliver us a Complete Solution with Minimal Delays
— Jarrod Ridgway | DGS
Michael and the team at GO Ind are a great team to work with, DGS have a lot of custom installations and GO Ind work closely with us to ensure they deliver us a complete solution with minimal delays during the communication process, giving us the opportunity to deliver our projects on time and at a high standard of quality.Thank you GO Industrial Team.
Read Reviews
Spare parts
I Trust GO Industrial Will All of My Needs - Thank You
— Karolis Aidukonis
I have been a customer of GO INDUSTRIAL for many years, and I can confidently say that their service is top-notch. The team is knowledgeable, friendly, and always goes the extra mile to ensure customer satisfaction. I trust GO INDUSTRIAL with all my needs. Thank you
Read Reviews
Pressure Cleaning Equipment
I Needed a Trusted Source to Build My Customer Vehicle From the Ground Up
— Branko | EcoJet Pro
Starting a new venture is always a challenge. I knew I needed a trusted source to build my custom vehicle from the ground up. I chose GO Industrial and I have never looked back. After the new build was complete, the service and support have been second to none as well. This has helped drive the business forward. I could not recommend a greater team of people to work with!
Read Reviews
Line marking equipment
The After Sales Service is Amazing
— Matthew Schwerdtfeger
GO Industrial have given me an exceptionally high level of service. They have listened and understood my needs as a line marking business and have delivered with 5 star all the way. They have excellent communication skills and have helped to thoroughly educate me on all issues of maintenance and servicing of the Graco Line Laser machine. I purchased a Graco 3400 at a very fair and competitive price. The after sales service is amazing! They have offered their skills, knowledge and insight into the line marking industry to help my business grow. I am very grateful for their generosity and feel very assured that my business and equipment is being looked after by absolute professionals. I highly recommend this business for all line marking business needs.
Read Reviews
Spare Parts
An Absolutely Impeccable Process
— John Bromhead
An absolutely impeccable process, from ordering, to the super fast delivery, the the top quality of the product.In 23yrs in the building, I have never dealt with a better, more efficient and knowledgeable rep in Jacob. His knowledge and ease of transitions the order is second to none!
Read Reviews