Installing terminators
Page 18
FlexPI Product Guide
Installing terminators
The FlexPI sensor cable must be properly terminated, to enable processor supervision of the
cable. To terminate the sensor cable, a terminal block is used to install a 1 M
Ω
resistor between the
center conductor and the shield at the end of the cable (away from the processor). Once the
sensor cable is mounted, you can install the terminator. Begin by cutting the cable at the specified
termination point. For outdoor cable installation, cut the cable approximately 0.5 m (20 in.) past the
specified termination point to allow for a drip loop. Create the drip loop by raising the enclosure
15 cm (6 in.) above the sensor cable run (see
).
Figure 17: Terminating the sensor cable
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2
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4
7
8
5
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Remove 2.5 cm (1 in.) of the outer jacket.
DO NOT nick the braided shield
.
Carefully, separate the strands of the exposed
braided shield.
Tightly twist the strands into a single conductor, and then
carefully remove 6 mm (0.25 in.) of insulation from the
center conductor. DO NOT nick the center conductor.
Insert the twisted shield into one of the terminals on the
terminal block and tighten the screw. Insert the center
conductor into the adjacent terminal and tighten the screw.
Insert the termination resistor into the opposing two
terminals and tighten the screws.
Line up the terminal block with the center of the enclosure
will fit into the enclosure’s cable guide bars. (*Or use 2
and apply 3 or 4 wraps of electrical tape* where the cable
Align the tape over the cable guide bars and press the
terminal block into the gel in the center of the enclosure.
Press the taped section of cable into the cable guide bars.
DO NOT remove the gel in the enclosure.
Snap the enclosure shut, ensuring that both
tabs are locked into the respective slots.
Using appropriate fasteners, attach the enclosure to
the mounting surface.
cable ties.)
