190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-194
30.4.32.12 Fuel Quantity
The GEA 24 and GSU 73 support fuel quantity inputs from both analog (resistance or voltage) and digital
(frequency) sensors. "Float" type resistive fuel quantity sensors are analog devices. Capacitive fuel
quantity sensors may be analog or digital devices, depending on whether they output a voltage (analog) or
a frequency (digital).
NOTE
When in-line resistors are installed as shown in Section 26, use "Voltage" configuration
setting, if in-line resistors are not installed, use "Resistive" configuration setting.
NOTE
Refer to Section 32.2.5 for information regarding swapping GEA 24 and GEA 24B units.
The GEA 24 supports four fuel quantity inputs (FUEL 1 through 4), any of which can be used with an
analog or digital fuel quantity sensor.
The GSU 73 supports four analog fuel quantity inputs (FUEL 1 through 4) and two digital fuel quantity
inputs (CAP FUEL 1 and 2). Of these inputs, up four can be configured at any one time.
For both the GEA 24 and GSU 73, up to four fuel quantity measurements may be configured, using one
item from each of the following groups:
• Group 1 - Fuel Quantity 1, Main Fuel 1
• Group 2 - Fuel Quantity 2, Main Fuel 2
• Group 3 - Aux Fuel 1
• Group 4 - Aux Fuel 2
If the CUSTOM FUEL setting is used in place, the installer can specify the gauge name that is displayed
for that input.
Analog and digital fuel quantity inputs may be configured interchangeably for the above listed Groups 1-4.
The "Fuel Quantity" and "Main Fuel" configurations are functionally the same, only the displayed text
differs.
NOTE
The GSU 73 FUEL 3 and 4 analog inputs require an external pull-up resistor when used
with a resistive analog fuel quantity sensor (see Figure 26-3.1
).
The analog and digital fuel quantity inputs require calibration (see Section
).
NOTE
Note: After performing fuel quantity calibration, it is advised to back up the calibration
data to an SD card (see Section
). Changing the configuration for a fuel quantity input
may reset calibration data.
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