Garmin G3X Installation Manual page 254

Sensor Type
Coolant temperature (or
other temperature)
Hydraulic pressure (or
other pressure)
Other parameters
For a GDU 37X system, or if a single GEA 24 or GSU 73 is installed, engines with up to 6 cylinders can be
monitored. A GDU 45X/46X system with dual GEA 24 EIS units installed can monitor a single engine
with up to 12 cylinders, including radial engines, or twin engines with up to 6 cylinders each (see 21.2.5).
For large single-engine applications, cylinders 1-6 are connected to GEA 24 #1 and cylinders 7-12 are
connected to GEA 24 #2. (see
21.2.3 Retrofit Engine Applications
When installing a G3X system in a completed aircraft with a typical piston engine, it is generally possible
to reuse a number of the existing engine sensors that may already be present. Consult section 28 for general
engine sensor wiring guidance that can be applied to existing sensors.
Sensor Type
RPM
Manifold Pressure
Oil Pressure
Oil Temperature
Exhaust Gas
Temperature
Cylinder Head
Temperature
Turbine Inlet
Temperature
190-01115-01
Rev. AA
Table 21-9 Sensors for Other Piston Engines
Use "Custom" temperature configuration with RTD, thermistor, or
thermocouple
Use appropriate Kavlico pressure sensor or select "Custom"
configuration and enter voltage-to-pressure calibration
See Table 21-1
Section 23.5.16)
Table 21-10 Retrofit Engine Sensors
Sensors that provide a digital output signal can be used without modification, if
calibration characteristics are known.
Do not connect G3X RPM inputs directly to magneto P-leads.
Sensors that provide a voltage output can be used without modification, if
calibration characteristics are known.
Sensors that provide a resistance or current output may require replacement
with a supported sensor (e.g. 494-30004-01).
Sensors that provide a voltage output can be used without modification, if
calibration characteristics are known.
Sensors that provide a resistance or current output may require replacement
with a supported sensor (e.g. 494-30004-00).
Existing sensors are generally likely to require replacement with a supported
sensor (e.g. 494-70004-00).
Type K thermocouples can be used without modification. The GEA 24 J242
connector matches the pinout used by certain other engine monitoring
systems.
Type J or K thermocouples can be used without modification. The GEA 24
J242 connector matches the pinout used by certain other engine monitoring
systems.
Type K thermocouples can be used without modification.
G3X/G3X Touch Installation Manual - Engine/Airframe Sensor Installation
Details/Part Number
Notes on Suitability for Reuse
Page 21-10