Fuel Quantity Measurement Systems
THINKING SAFETY
Fuel Quantity Measurement Systems
Signal Conditioning Units
The AUTOFLUG Signal Conditioning Units (SCU) are designed and
manufactured in various configurations for Fuel Quantity Measurement Systems (FQMS) and Fuel Management Systems (FMS).
The SCU contains different electronic circuitry designed in
Fuel Sensors
accordance with RTCA / DO-254 to satisfy all functional and
environmental requirements:
The AUTOFLUG Fuel Gauge Transmitters (FGT) are active ca-
• Processing and Communication Unit
pacitance type sensors designed to measure the fuel height
• Sensor Processing Unit
inside the tanks of fixed wing aircraft, helicopters and land
• Level Sensor Processing
vehicles.
• Pump and Valve Driver Unit
• Power Supply Unit
The AUTOFLUG Fuel Gauge Transmitters
• EMI Protection / Filter Unit
• measure the capacitance and produce an EMI-robust out-
The AUTOFLUG SCUs process Fuel Sensor signals and gen-
put signal, e.g. pulse width modulated (PWM) or frequency
erate discrete, analogue and/or digital outputs (ARINC 429,
output
RS232, CAN, TTP, MIL STD 1553B, etc.) as required.
• provide an outer tube shielding the sensing element
against electromagnetic interference
The AUTOFLUG SCUs perform the following functions:
• are immune to wiring problems such as parasitic capacitance, leakage resistance and/or poor shield connections
• do not require any maintenance and are easy to install either
as flange mounted or clamp mounted versions
• meet intrinsic safety requirements with respect to limited
current, voltage and stored energy
• Fuel Quantity Measurement
– Fuel type & temperature compensation
– Flight attitude (acceleration) compensation
– Fuel quantity calculation
– Filtering to suppress fuel sloshing effects
• Fuel Level Sensing (independent)
• are available as crashworthy sensors suitable for helicopter
applications
– Fuel high level detection
– Fuel low level detection
• Fuel Management
AUTOFLUG flexible Fuel Gauge Transmitters can be mounted
– Pump control, e.g. fuel supply and balancing
in a pre-installed guiding tube or supplied already installed in
– Valve control, e.g. refueling, fuel transfer
a curved tube.
• System monitoring and built-in test
tance type and optical versions.
The AUTOFLUG Signal Conditioning Unit software is of mod-
AUTOFLUG Fuel Gauge Transmitter and Fuel Level Sensor de-
ular design and can be tailored to a specific application with
signs are based upon “construction kits” allowing AUTOFLUG
minimized programming effort. The software is developed
to generate custom designs using standard parts and proven
and verified in accordance with RTCA/DO-178B.
www.autoflug.de
materials.
THINKING SAFETY
10-2015
AUTOFLUG Fuel Level Sensors are available as active capaci-