190-01115-01
G3X/G3X Touch Installation Manual - Engine/Airframe Sensor Installation
Rev. AC
Page 23-15
23.3.1.1 Lycoming and Continental Engine Sensor Installation
General Installation Guidance –
To maintain measurement accuracy, Type K thermocouple (TC)
extension wire must be used to connect the CHT 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 is 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 ensure they are exposed to similar ambient temperatures.
When using Alcor Type K probes, refer to Alcor CHT Installation Instructions (P/N 59167) for complete
installation details. Engine manufacturer’s guidance should always be consulted for proper location of
CHT probes. A finger sized loop should be provided to allow sufficient strain relief of the probe assembly,
and care should be taken to ensure that no chafing of the wires occurs.
Figure 23-2 CHT Probe Package
Figure 23-3 CHT Probe Well
