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2.4 Connecting the Fiber Optic Cable
Use care in handling the fiber optic cable. Even though it is armored, sheathed, and sealed for durability,
individual glass fibers within the cable can be damaged by mishandling. Avoid dropping, shocking, kinking,
pulling, or sharply bending the cable. When routing the fiber optic cable, it is important to observe the
minimum bend radius specification of 3 inches (7.6 cm). Bending the fiber optic cable more sharply than
specified radius can result in low temperature readings due to excessive infrared energy losses in the cable.
The fiber optic cable is connected to a sensor in the fiber optic adapter as shown in Figure 9.
1.
Insert the cable into the fiber optic adapter. The cable must be inserted all the way to the bottom of the
adapter hole for the cable grip to seat and to avoid calibration errors.
2.
Tighten the cable grip to seal the cable against moisture.
Model HIR Electronics
Housing
2. Tighten cable grip
1. Insert cable
Note: Do not unscrew this ½” NPT
connection without first
disconnecting the sensor wires.
Otherwise, damage to internal
wiring could result.
¾” NPT
Conduit
Connection
Figure 9
– Inserting the Fiber Optic Cable
