Transfer, Filtering
Measuring and Control

More than 50 years developing equipment for the transfer, filtering, measuring and control of fuels, AdBlue®, lubricants and other automotive fluids.

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High flow meters

M 50 and M 80 high flow meters: speed and accuracy for demanding operations

High-accuracy measurement for high industrial flow rates

The GESPASA Series M meters are positive displacement volumetric meters designed to provide extremely accurate measurement of fuels, hydrocarbons, biofuels and other low-viscosity liquids. Thanks to their internal three-rotor metering technology and calibration systems, they guarantee reliable results even under variable pressure and temperature conditions.

General features of the range
• Wide flow range: from 25 to 3,000 L/min, covering requirements from medium-sized installations to high-volume operations.
• High accuracy: ±0.2 % with repeatability ≤ 0.07 %.
• Fluid compatibility: fuels, biodiesel, kerosene, petrol, light oils and other non-corrosive liquids.
• Robust construction: bodies in aluminium or stainless steel depending on the model, with Viton seals or PTFE in special versions.

Integrated safety and quality systems
• Internal air eliminator to remove air bubbles.
• Metal mesh strainers (80–170 µm).

Configuration versatility
• Direct mechanical register.
• Version with pulser output for connection to controllers or PLCs.
• Models with electronic preset or integration with GE display modules.
• ATEX-certified versions for explosive atmospheres.

In environments where refuelling time is a critical factor and large volumes of fuel must be handled in the shortest possible time, GESPASA high flow meters are a reliable and efficient technical solution. The M 50 and M 80 models have been specifically designed to integrate into rapid-loading installations, such as fleet refuelling stations, high-turnover logistics points or central fuelling depots.

These devices stand out for their ability to measure high flow rates without losing accuracy, even under continuous-duty conditions. Thanks to their optimised internal design and the durable materials from which they are manufactured, they provide stable measurement, without interruptions or drift, during intensive operating cycles.

The M 50 model is prepared to handle medium-to-high flow rates, making it ideal for applications where agility and reliability are combined with compact installation requirements. For its part, the M 80 offers higher performance in terms of volumetric capacity, making it especially useful in tanker loading systems, heavy machinery refuelling or large-scale logistics terminals.

Both models are built to withstand continuous use in demanding environments. Their internal components are designed to minimise wear even when working with fuels subject to variable pressure or extreme temperatures. In addition, their mechanical metering system provides accurate results without the need for complex electronics, although they can easily be adapted with digital pulsers to integrate the data into centralised management systems.

The M 50 and M 80 meters combine perfectly with GESPASA high flow pumps, as well as with industrial pump dispensers, automatic nozzles and safety filters. This compatibility guarantees simple and rapid integration into complete professional transfer solutions.

Another key advantage is their low maintenance, which makes them ideal for installations where constant availability is essential. Their proven reliability in intensive operations reduces downtime and ensures continuous control of the volume supplied.

Thanks to their robust design, consistent accuracy and adaptability, the GESPASA M 50 and M 80 high flow meters have established themselves as indispensable tools for any installation that needs to manage large fuel flows with efficiency and reliable metrological control.

M50 high flow meter

High flow M-50 meter

The GESPASA M-50 high flow meter is a positive displacement volumetric meter designed to measure fuel supply accurately in industrial and high-capacity refuelling installations. Its architecture is based on a measuring chamber with three rotors that rotate in unison, driven by a timing gear train that synchronises the movement and transmits the rotation to the register, ensuring a stable and repeatable reading even when there are variations in pressure, temperature or viscosity in the line. Thanks to this mechanism, the M-50 maintains accuracy under real operating conditions, with a maximum error of ±0.2 % and repeatability ≤ 0.07 %.

Designed for high flow in diesel and petrol, the M-50 covers a range from 55 to 550 l/min and is connected by 2” flanges. Its hydraulic sizing minimises pressure drop and, together with the stability of the rotor system, allows sustained flow rates without sacrificing accuracy. To protect metrological integrity, it incorporates an air eliminator — preventing air pockets from being counted — and an integrated strainer with 80/170 µm mesh, so the fluid enters the measuring chamber in filtered condition. This combination is key to maintaining meter performance through thousands of loading cycles, with fewer maintenance stops and greater installation availability.

The body of the M-50 is made of aluminium with Viton seals, a robust choice compatible with common fuels. There is no erosive metal-to-metal contact inside the chamber, which reduces internal wear and preserves calibration over the long term. In addition, the instrument incorporates a stepless adjustment mechanism that allows fine micro-adjustment of the calibration point to align the indication with site reference standards. The working temperature range is wide (−30 °C to +71 °C) and the maximum permitted pressure reaches 10 bar (145 psi), so the meter can be safely integrated into pressurised manifolds, discharge lines and transfer skids.


For environments with safety requirements in explosive atmospheres, the M-50 has ATEX II 2G certification, with protection mode Ex h IIB T5 Gb, meeting the usual requirements in pump rooms, loading bays and distribution plants. The family supports several readout configurations: mechanical register, pulser output for connection to external systems, or GE electronic display — ideal when litre preset, shut-off by solenoid valve and communication with supervision are required. This versatility facilitates its integration into both stand-alone equipment and electronic or mechanical high flow dispensers, while maintaining the same metrological base.

In real applications, the M-50 is the reference meter within GESPASA equipment from 300 to 500 l/min, where it is combined with high flow BDP pumps and GE electronics or GK-7 controllers; in this way, a transfer set is obtained with presetting, partial/total totalisation and consumption management. This native compatibility with the brand's electronics simplifies integration and supply traceability, while maintaining the meter's volumetric accuracy.

For the integrator, the M-50 also offers ease of assembly and maintenance. The 2” connection, the packing dimensions of 510 × 460 × 490 mm and the gross weight of 28 kg streamline logistics and mounting on a base or frame. The pulser output allows the signal to be sent to PLCs or the GE console, and the range of options — pulser, mechanical presetter with shut-off valve and printer version — broadens the scope of control during loading and unloading. With this, the M-50 can act as the main meter in dispenser islands, tank-to-tank transfer lines or dispatch skids, always with the same objective: reliable and stable measurement at high flow rates.

The M50 high flow meter condenses GESPASA's experience in high-performance volumetric metering: 55–550 l/min, ±0.2 % accuracy, ≤ 0.07 % repeatability, air eliminator and 80/170 µm strainer as standard, aluminium body with Viton, −30…+71 °C, 10 bar and ATEX II 2G Ex h IIB T5 Gb. A robust, adjustable meter ready to integrate with GE electronics and GK-7 systems, created for diesel and petrol supply where accuracy and operational continuity are non-negotiable.

M80 high flow meter

The M-80 high flow meter is GESPASA's solution for high-volume fuel transfer when accurate and stable readout is required above 1,000 l/min. Based on the same positive displacement technology with three synchronised rotors, the M-80 ensures consistent measurement in tank loading and unloading lines, industrial dispenser manifolds and pumping units, even with pressure or temperature variations resulting from the duty cycle. The engineering design, with no erosive metal-to-metal contact in the chamber, minimises wear and protects calibration over time.

With a range of 115 to 1,150 l/min and a 3” connection, the M-80 is prepared to operate as the main meter in 1,000 l/min systems mounted on a bedplate, where it is combined with high flow BDP vane pumps and control electronics. This integration is common in the brand's high flow electronic and mechanical supply equipment, where the M-80 provides the metrological basis on which the GE console performs volume presetting and valve control, or else communicates with the GK-7 controller for consumption and user management.

Accuracy is ±0.2 % with repeatability ≤ 0.07 %, values maintained thanks to the stability of the timing gear train and the low-friction design of the rotor assembly. As standard, the M-80 includes an air eliminator — to prevent air from being counted as liquid — and a strainer with 80/170 µm mesh, which protects the measuring chamber and reduces premature contamination. Like the rest of the range, the body is aluminium, with Viton seals and a micro-adjustment mechanism for fine-tuning calibration in the field. The meter operates between −30 °C and +71 °C, withstands up to 10 bar, and is supplied with ATEX II 2G under Ex h IIB T5 Gb, for use in potentially explosive atmospheres.

In terms of connectivity, the M-80 can be configured with a mechanical register, pulser output or GE electronic display, depending on the level of automation required. The pulser output enables direct connection to PLCs, SCADA systems and the GE console — which offers total/partial display and presetting; in turn, the GESPASA ecosystem enables integration with the GK-7 controller for fleet control and own-consumption management, using RS-485 communication and the brand's protocol. This set of options makes it easy to deploy solutions from simple loading islands to managed systems with users, limits and reports.

The M-80 is designed for installations where operational continuity is critical: internal refuelling terminals, logistics bases or industrial plants with simultaneous flow and accuracy requirements. The 3” connection and its packing size of 580 × 500 × 610 mm, with a gross weight of 47 kg, make mounting on a base frame and connection to large-diameter manifolds easier. When 1000 l/min systems are required, integration of the M-80 into GESPASA electronic or mechanical equipment is direct, maintaining supply traceability and reliable readout in every loading cycle.

Operationally, the meter is optimised for diesel and petrol, meeting ATEX safety requirements and offering low maintenance thanks to the absence of erosive metal-to-metal contact in the chamber. Its continuous micro-adjustment allows deviations after servicing tasks or changes in process conditions to be compensated, maintaining ±0.2 % over time. In environments with advanced electronics, the pulser output and compatibility with GE and GK-7 provide a layer of control, presetting and event logging that simplifies audits and inventory reconciliations.

The M80 high flow meter is the reference meter for high flow when metrological accuracy, mechanical robustness and automation compatibility are required: 115–1,150 l/min, ±0.2 %, ≤ 0.07 % repeatability, air eliminator and 80/170 µm strainer, aluminium + Viton, −30…+71 °C, 10 bar and ATEX II 2G Ex h IIB T5 Gb. All of this with direct integration into 1000 l/min equipment, connection to GE and GK-7, and the reliability that characterises the GESPASA M series.

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Certifications and standards

ATEX

Equipment for
explosive atmospheres

ISO 9001

Quality management
system

CE marking

Compliance with
European regulations