Diesel Flow Meter Comparison: K24, K33, K44 and K700 Explained

Picking a diesel flow meter looks simple until you line up four PIUSI models that share the same basic job but differ in almost every other way. The K24, K33, K44 and K700 all measure litres dispensed, but flow rate range, output type, connection size and accuracy vary enough to matter for your purchasing decision. Get the match wrong and you either bottleneck a 90 L/min pump with an undersized meter or pay for pulse output and remote monitoring capability you'll never use.

This diesel flow meter comparison breaks down the specs that actually decide the outcome: flow rate range, mechanical versus pulse output, connection size, and how each meter pairs with PIUSI pumps already running on your site. By the end you'll know which meter suits a workshop bowser, a farm refuelling trailer, or a bulk tank filling station running through a PETRO Industrial self-bunded tank.

Whether you're speccing a new fuel point from scratch or replacing a tired meter on an existing pump, the right choice usually comes down to flow rate matching and whether you need data output for a fuel management system.

What's the Difference Between the K24, K33, K44 and K700?

The PIUSI K24, a mechanical oval-gear meter rated at 20-120 L/min with a resettable totaliser, is the entry point in the range. View Product. It has no digital display, just a mechanical counter, which makes it a straightforward, low-maintenance option for sites that don't need batch dispensing or logging.

Step up to the PIUSI K33, a mechanical meter with a digital LCD display and batch preset function, also rated at 20-120 L/min. View Product. The digital face lets you set a preset volume and track totals more precisely, and an ATEX-rated version exists for hazardous area installations.

The PIUSI K44 shares the K33's digital display and preset function but handles a higher flow rate range of up to 160 L/min. View Product. It's the meter fitted to PIUSI's Cube 90/44 pump kit, which runs a 90 L/min pump, so the meter needs headroom above the pump's rated output to avoid restricting flow.

The PIUSI K700, a cast iron pulse meter built for high-volume transfer with a flow range up to 700 L/min, sits in a different category altogether. View Product. Its 2" BSP connection and pulse output make it suited to bulk delivery and tanker offloading rather than nozzle-in-hand dispensing at a workshop bowser.

Diesel Flow Meter Comparison: Specs Side by Side

Lining the four models up side by side makes the decision easier once you know your pump's rated flow and whether you need digital output.

Note the overlap between the K24 and K33: same flow range, but the K33 earns its higher price with a digital display and preset dispensing, which matters if you're issuing fuel to multiple drivers or vehicles and need a clean, repeatable measure. The K44's extra flow headroom is the whole reason to choose it over a K33 when pairing with a pump rated above 70 L/min.

Which Meter Suits Your Industry?

Agricultural operations refuelling tractors and headers from a farm tank generally sit well within the K24 or K33 range. A 45 L/min PIUSI Pitstop pump paired with a K33 gives batch control for tracking fuel used per machine without overspending on flow capacity you'll never reach.

Fleet transport depots and workshops running higher-output pumps like the PIUSI EX50 (50 L/min) or the Cube 70/33 kit typically land on the K33 or K44 depending on how many vehicles cycle through per day. Where multiple bays draw from one bulk tank, the K44's higher ceiling avoids restricting flow during peak refuelling windows.

Mining and construction sites, along with power generation operators running large generator sets, often need the K700's bulk transfer capacity. Filling a 10,000L self-bunded tank from a tanker, or moving diesel between site tanks, calls for the flow rate and pulse output the K700 provides, especially where that data feeds into a fuel management system for reconciliation.

Workshops handling smaller volumes but wanting accurate job costing benefit from the K33's preset function paired with the PIUSI A60 diesel automatic nozzle. If you're specifying a new dispensing point from the ground up, it's worth browsing the full range of PIUSI fuel pumps to match pump output to meter capacity before you commit to either.

How Do These Meters Fit Into a Complete Fuel Management Setup?

None of these meters work in isolation on a well-run site. The K700's pulse output is designed to feed data into a broader system, and that's where PETRO Industrial's iPETRO Link Gateway and iPETRO Lite FMS come in, giving you remote tank level monitoring and dispensing records without walking out to check a mechanical counter.

If your site runs a self-bunded diesel tank, pairing it with an iPETRO hydrostatic level transmitter and a K700 on the delivery line gives you both inbound and outbound volume tracking. For smaller sites where preset batching is enough, a K33 or K44 on a Cube pump kit covers day-to-day dispensing without the added infrastructure.

It's also worth checking your filtration setup alongside meter selection, since a fouled filter restricts flow and throws off readings on any of these meters. The range of fuel and oil filters on site should be matched to your pump's flow rate the same way a meter is.

For sites building out a full fuel monitoring solution rather than a single dispensing point, it's worth reviewing the fuel monitoring systems collection before finalising your meter choice, since some FMS kits already bundle a compatible meter.

What to Buy

If you're running light diesel dispensing from a farm tank or small bowser, the PIUSI K24 covers 20-120 L/min without added cost for features you won't use.

For workshops and fleet bays wanting batch control and a digital readout, the PIUSI K33 is the practical mid-range choice, with an ATEX-rated version available for hazardous area sites.

Where your pump exceeds 70 L/min, such as the Cube 90/44 kit, step up to the PIUSI K44 for headroom that won't restrict flow.

For bulk transfer, tanker offloading, or any application feeding data into an iPETRO fuel management system, the PIUSI K700 handles up to 700 L/min with pulse output built in. Pair it with a PETRO Industrial self-bunded tank and an iPETRO Link Gateway for a complete monitored refuelling setup, and browse the full flow meters collection to compare fittings and mounting options before you order.

Need help choosing the right setup? Contact the PIUSI Shop team for advice specific to your pump and tank configuration.

FAQ

What's the difference between the PIUSI K24 and K33 flow meter?

Both cover a 20-120 L/min flow range, but the K24 is a purely mechanical meter with a resettable totaliser, while the K33 adds a digital LCD display and batch preset dispensing for more precise fuel tracking.

Can I use a K33 meter with a 90 L/min pump?

Not ideally. The K33 is rated to 120 L/min in mechanical terms but is typically paired with pumps up to around 70 L/min in PIUSI's kit configurations. For a 90 L/min pump like the Cube 90/44, the PIUSI K44 is the better match.

Is the K700 meter suitable for AdBlue as well as diesel?

The K700 is built for diesel and similar fuels with a cast iron body rated up to 700 L/min. For AdBlue, PIUSI offers dedicated stainless steel pulse meters designed for the fluid's corrosive properties, which shouldn't be substituted with diesel-rated meters.

Do these meters work with a fuel management system like iPETRO?

The K700 and other pulse-output meters in the PIUSI range are designed to feed data into fuel management systems, including PETRO Industrial's iPETRO platform, for remote tank monitoring and dispensing reconciliation. The K24 has no digital output and works as a standalone mechanical counter.

What size pump should I pair with a K44 meter?

The K44 handles flow rates up to 160 L/min, which comfortably covers pumps like the 90 L/min unit in PIUSI's Cube 90/44 kit, with headroom to spare so the meter doesn't restrict flow during peak dispensing.