190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-198
30.4.32.13 Fuel Flow
The following sensors can be configured for the Fuel Flow input on the GEA 24 or GSU 73:
• Electronics International FT-60 (0-70 gph)
• Electronics International FT-90 (0-125 gph)
• Electronics International FT-120 (0-250 gph)
• Floscan 201B-6
• Floscan 231
• Custom sensor
The fuel flow input requires calibration of the K-factor (pulses per gallon) (see Section 21.3.10.1
). The
Custom configuration option supports any fuel flow sensor with a maximum output frequency of up to 5
kHz.
FADEC
: The GEA 24 can be configured to monitor fuel flow data from the following FADEC
interfaces:
• Rotax (912iS/915iS/916iS)
• ULPower
The GEA 24 and GSU 73 also have provisions for a second fuel flow input (FUEL FLOW 2) to use in
aircraft that require a second fuel flow sensor for differential fuel flow measurement. If both fuel flow
inputs are configured, the displayed fuel flow will be FUEL FLOW 1 (feed) minus FUEL FLOW 2
(return).
30.4.32.13.1 Fuel Flow Calibration
The Fuel Flow input requires calibration as detailed below.
K-Factor – Enter the ‘K’ factor (pulses per gallon) for the fuel flow sensor (Section 21.3.10.1
).
When installing the fuel flow sensor, the installer should take note of number on the tag attached to the
sensor (if applicable). This number is the calibrated K-factor of the sensor. For sensors that are not
supplied with a specific calibration value, use the default K-factor value provided.
The K-Factor represents the number of electrical pulses output by the sensor per gallon of fuel flow.
Aspects unique to each installation will affect the accuracy of the initial K-Factor, and as a result, the K-
Factor must generally be adjusted up or down to increase the accuracy of the fuel flow calibration.
If the fuel usage reported by the G3X differs from the actual fuel usage, as measured at the fuel pump (or
other trusted method of measurement), use the following formula to calculate a corrected K-Factor, which
can then be used to calibrate the fuel flow.
Corrected K-Factor = ( [G3X reported fuel used] x [previous K-factor] ) / [actual fuel used].
For differential fuel flow installations (when a return flow meter is used) the K-factor adjustment applies to
the normal (forward) flow sensor only. The K-factor must be adjusted until the displayed Net Fuel Flow
equals the Forward Flow minus the Return Flow (see preceding figure).
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