Electronics International CA-1 - Manual (Page 14)

NOTE: A Carb Temp Probe should be connected to the precision channel on a CA-1, A-1 or EAC-1 unit. A
three to four degree F error can occur in some instances if the Carburetor Probe is not connected to a preci-
sion channel.
5. OAT Probe Installation:
Mount the OAT Probe in an appropriate location on the aircraft, using the hardware supplied. The OAT
Probe is sensitive to air temperature changes. For this reason, do not mount the OAT probe in the path of the
cowl or engine exiting air (i.e., on the belly of the aircraft). Also, the probe should not be mounted within 8
inches of an exhaust pipe. The radiant energy from the exhaust pipe can cause the probe to read slightly
high. Other than these considerations the OAT Probe may be mounted in an air intake vent, on the side of
the cowling or anywhere else on the aircraft.
NOTE: An OAT Probe should be connected to the precision channel on a CA-1, A-1 or EAC-1 unit. A three
to four degree F error can occur in some instances if the OAT Probe is not connected to a precision channel.
6. Route the Extension Cables:
Mark both ends of each cable with the appropriate cylinder and/or probe type. Plug each probe into its
associated extension cable. Be sure the connectors mate properly. When tie wrapping these cables down,
be sure there is no strain or pulling on the cable against the probe housing. Each probe should have 3 to 4
inches of slack to allow the engine to move in its mount without breaking any wires. Also, there should be a
tie wrap near the probe connectors. Dress each cable up to the instrument or remote switch keeping them
away from any hot areas (exhaust stacks, cylinder heads, etc.).
We do not recommend removing the connectors when installing the extension cables but if you must shorten
the cable, pull any excess cable length through the fire wall and cut it off at this time. However, it is recom-
mended you leave some extra wire length under the instrument panel for later modifications. Varying cable
lengths will not affect the accuracy of this instrument so cables of any length may be ordered from the
factory. The Extension Cables and probe wires are made of type K thermocouple wire that must not be
substituted or extended with regular copper wire. Also, it is important these wires not be kinked (i.e., do not
bend the wires on a radius less than 1 inch).
Attach the appropriate connectors to the ends of each of the Extension Cables as described below:
Red Slip-on Connectors
A) Strip the overbraid back 3 1/2". Be careful not to nick the wires.
B) Shrink a piece of 1" heat shrink over the cut portion of the overbraid.
C) Split the two wires back 3". Be careful not to nick the wires.
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5. OAT Probe Installation Installation Instructions