Dynon Avionics SkyView System Installation Guide - Manual (Page 149)

SV-EMS-220/221 Installation and Configuration
SkyView System Installation Guide – Revision S 7-37
CHT wire may be extended as well, provided that:
1) Type J thermocouple is used for the extension wire. (This is different than EGT
wire)
2) There is no temperature change across the connection between the junction
that is created. For example, do not create a junction across the firewall.
If either of the above guidelines are not followed, your CHT readings will be
incorrect.
Dynon Avionics sells and supports a variety of CHT probes. All thermocouple harnesses supplied
by Dynon have each function (e.g., CHT1, EGT1) labeled on each thermocouple pair.
Lycoming/Continental
Dynon Avionics sells bayonet style CHT probes (used in Lycoming and Continental engines).
With each probe we sell, a bayonet adapter is included. Your specific engine manual should
describe where to mount these bayonet adapters, but normally, there is a threaded hole (CHT
well) near the bottom of the cylinder close to the lower spark plug. Screw the bayonet adapter
into this hole. Screw the locking collar up or down the spring surrounding the probe such that
the tip of the probe is pressed against the bottom of the CHT well when the collar is attached to
the adapter. Insert the CHT probe into the well and lock the collar to the adapter. Now, plug
each thermocouple wire into its corresponding wire on the thermocouple harness. Ensure that
you match the wire color pairs on the harness to those on the thermocouples.
Rotax 912 (except 912 iS) and Rotax 914
Rotax 912 and Rotax 914 engines use 2 resistive CHT probes that are included with the engine.
These probes are preinstalled, but you need to route the connections from them to the SV-
EMS-220. See the Rotax CHT Sensors Section for information on making the physical connection
to the sensor.
Jabiru
Jabiru engines require a 12 mm ring-terminal CHT probe for each cylinder. First, slide the
compression washer off the spark plug. Slide the 12 mm ring-terminal probe onto the plug.
Now, slide the spark plug compression washer back onto the spark plug. Reinstall the spark plug
into the spark plug hole. Please refer to the documentation that came with your engine for
more information. Now, plug each thermocouple wire into its corresponding wire on the
thermocouple harness. Ensure that you match the wire color pairs on the harness to those on
the thermocouples.
Tachometer
Tachometer pulses/revolution are set in the Engine Information Wizard – SETUP
MENU > HARDWARE CALIBRATION > EMS CALIBRATION > TACHOMETER
CALIBRATION.
Dynon Avionics does not sell a tachometer transducer.