190-01115-01 G3X/G3X Touch Installation Manual - Engine/Airframe Sensor Installation
Rev. AC Page 23-16
Figure 23-4 One Piece CHT Probe Installed
23.3.2 EGT (Exhaust Gas Temperature)
Sensor Description – Type K grounded thermocouple probe with integrated clamp for mounting in an
exhaust pipe.
If ungrounded thermocouples are used, the low side must be taken to a GEA 24/GSU 73
ground pin.
23.3.2.1 Engine Sensor Installation
General Installation Guidance – To maintain measurement accuracy, Type K thermocouple (TC)
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. TT-K-22S Type K thermocouple wire from Omega Engineering is one
such example of appropriate wire. 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 ensure
they are exposed to similar ambient temperatures.
When using Alcor Type K probes, refer to Alcor EGT Installation Instructions (P/N 59180) for complete
installation details. Engine manufacturer’s guidance should be consulted and followed for proper location
of EGT probes.
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