Garmin G3X - Page 980

190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page H-130
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).
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
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
).
The analog and digital fuel quantity inputs require calibration (see Appendix H.4.19.4
).
NOTE
Note: After performing fuel quantity calibration, it is advised to back up the calibration
data to an SD card (see Appendix H.4.19.4
). Changing the configuration for a fuel
quantity input may reset calibration data.
Position
The GEA 24 and GSU 73 each have multiple POS inputs. Each POS input can be used with a resistive
(potentiometer) sensor to monitor the following position measurements:
• Elevator Trim
• Aileron Trim
• Rudder Trim
• Flap Position
These inputs require calibration (see Appendix H.4.19.4
).
Vertical Power
: When using a Vertical Power unit, trim and flap positions will automatically be displayed.
Connecting, configuring, and calibrating the POS inputs is not required when the position sensors are
connected to a Vertical Power unit.