G900X/G950 Installation and Maintenance Manual – GEA 71
Page 5-13
190-00719-00
Revision D
5.6.2.2
CHT (Cylinder Head Temperature) Sensor
Sensor Description:
Type K grounded thermocouple installed in CHT well. Two probe options exist:
1.
Two piece bayonet probe with separate probe well adapter (Alcor P/N 86252 and 28202)
2.
One piece probe with integrated well adapter (Alcor P/N 86253)
Both one piece and two piece probes are electrically equivalent. The one piece probe has the advantage
of not requiring the external CHT well adapter (reduced cost), while the two piece probe may provide a
more simplified installation and removal.
General Installation Guidance:
To maintain measurement accuracy, thermocouple (TC) wire must be connected directly to the inputs on
the GEA. If the supplied sensor wires are not long enough to connect directly to the GEA, then Type K
TC extension wire must be used. 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 would
be TT-K-22S Type K thermocouple wire from Omega Engineering.
Alcor P/N 59188 CHT Installation Instructions should be referenced for complete installation details
when using the two piece probe, while Alcor P/N 59167 CHT Installation Instructions should be
referenced for complete installation details when using the one piece probe. Engine manufacturer’s
guidance should always be consulted for proper location of CHT probes. As with the EGT probe
installation, 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 5-4. One Piece CHT Probe Package