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Fuel measurement and management

Fuel measurement and management systems

Eaton’s fuel quantity measurement and management portfolio features the latest advancements in digital sensing technology to significantly improve accuracy and weight reduction. From complete turnkey systems to customer-integrated component solutions, our products help airframe and sub-system suppliers optimize safety, reliability and life cycle costs.

Solutions that reduce weight, enhance accuracy

Eaton continuously works to improve product performance through material and design innovations:

  • Our simplified, unshielded harness helps reduce aircraft weight.
  • Probes are made from extremely lightweight carbon epoxy tubes.
  • Storing calibration data on probes (including A-D conversion errors) significantly enhances system-level accuracy.
  • Fuel temperature sensors (+/- 1°C) are built into probes without additional wiring.
digital-capacitance-probes.jpg
Eaton digital probe harness
Digital probe harness

Eaton’s simplified wiring system boosts reliability

Wiring faults are the leading cause of in-tank repairs. To reduce in-service tank entries, Eaton designed a simplified wiring solution that eliminates shielding headaches. Our patented digital probe harness accommodates up to eight probes, a compensator and a densitometer, all of which can be accessed over the same unshielded four-wire bus. Eaton’s probe circuit reliability exceeds 2 million hours MTBF, and circular connectors (D38999 equivalent) on probes help reduce installation time.

Typical architecture

  • Capacitance probes read height proportional to capacitance.
  • Compensators read fuel dielectric to normalize probe readings.
  • Densitometer measures fuel density so volume becomes mass.
  • Fuel quantity computer reads probe capacitance, temperature and calibration data; and calculates heights, volumes and masses per tank as function of pitch and roll.
  • Refuel panel communicates with fuel quantity computer to automatically control refueling.
Typical airwing fuel architecture

Experts in probe placement, accuracy analysis

By building expertise in areas such as macro programming and automation, Eaton is driving advancements in probe placement, optimization, accuracy analysis, and lookup table generation.

eaton-example-fuel-tank.jpg
Example tank
eaton-visualizing-ungagued-volumes.jpg
Visualizing ungauged volumes
eaton-probe-placement-tool-input.jpg
Probe placement tool input screens
eaton-ht-variation-wing-tank-flight.jpg
Ht variation in wing tank over flight
eaton-accuracy-analysis-output.jpg
Accuracy analysis output (each pitch & roll)

Related products

Eaton’s fuel-measurement products meet the latest FAA 25.981 intrinsic safety requirements and feature advanced capabilities and weight-saving designs.

Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.
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