190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 21-19
Figure 21-5 One Piece CHT Probe Installed
21.3.2 EGT (Exhaust Gas Temperature)
Type K grounded thermocouples are supported for exhaust gas temperature (EGT) measurements.
NOTE
If ungrounded thermocouples are used, the low side must be taken to a GEA 24/GSU 73
ground pin.
To maintain measurement accuracy, Type K thermocouple extension wire must be used to connect the EGT
probe sensor wires directly to the inputs of the GEA 24/GSU 73. To minimize risk of breakage, it is
recommended that a high quality stranded (as opposed to solid) thermocouple wire be used. One such
example of appropriate wire TT-K-22S Type K thermocouple wire from Omega Engineering.
Thermocouple extension wire lengths may vary between cylinders for installation convenience; there is no
requirement to use the same length of thermocouple extension wire for each engine cylinder. However, for
each individual thermocouple lead, the positive and negative wires should be the same length. When
attaching thermocouple extension wire with splices or connectors, the connections for an individual pair of
positive/negative wires should be located close together to
make sure they
are exposed to similar ambient
temperatures.
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