AVL Fuel Reference

The AVL Fuel Reference is a professional calibration system for the efficient verification of AVL measurement devices and their setup on the testbed.

AVL Approach

The range of application includes the execution of regulation conform calibrations, plausibility checks of fuel consumption measurement results and testfield wide comparability checks of fuel consumption measurement results. Easy installation on the testbed and user-friendly application - as well as automatic execution of calibration procedures and calibration report generation - reduces the calibration effort by up to 1 hour.

Benefits at a Glance

  • Calibration of the whole measurement chain including device and test cell integration
  • High repeatability and precise calibration results thanks to the special hydraulic architecture
  • Fulfills all current and pending legislation regulations regarding calibration of fuel consumption measurement devices (ISO, EPA 40 CFR Part 1065 and UN ECE R49)
  • Reduction of installation effort by up to 30 minutes
  • Calibration without fuel waste and unnecessary recycling costs via direct coupling to the fuel consumption measurement device
  • Compatible with all actual AVL fuel consumption measurement devices and PLU Sensors
  • Reduction of the overall calibration effort (installation and execution of the calibration) by up to 60 minutes

Technical Data

AVL Fuel Reference

Type: Fuel Reference
Measurement principle: PLU or mass flow
Measurement ranges:
Mass flow

0.03…300 l/h*)
0…250 kg/h *)
Systematic measurement uncertainty:

≤ 0.1% (to DIN 1319)
1 g/dm³
Interfaces / to measurement devices:
AVL Measurement systems:
PLU Sensors:
(only for Fuel Reference PLU)

Ethernet, RS 232,
frequency, temperature, density sensor, thermocouple
Fuel types: 100% bio fuels
Power supply: 230/110V, 50-60 Hz
Ambient temperature: 15…45 °C
Dimensions (W x H x D): 610 x1145 x545 mm

*) with different sensors

Measuring Principle

PLU Measurement Principle
The PLU positive displacement meter combines a servo-controlled gear counter with a dynamic piston sensor. A gear meter (2) driven by a servo motor (7) with encoder (8) defines a geometric volume to pulse frequency ratio when gear rotation is adjusted to media flow.

A bypass (5) ensures zero pressure difference (∆p=0) between inlet and outlet, preventing leakage flow. Flow changes immediately displace a zero-friction piston (4) in either direction.

A piston position sensor (3) and a servo controller (9) provide a fast gear speed control loop keeping the piston centered.

Mass Flow Measurement Principle
Fuel passes through a U-shaped tube, which vibrates at its natural frequency. This frequency is proportional to the fuel density, which in addition to the mass flow is a separate measurement variable and thus allows for the output of volumetric measurement values. The time lag of the vibration frequency C1 to C2 is proportional to the mass flow.