User's Manual
3
4. Weather-Tight Connector, P/N 73-117068-027 is used
to provide appropriate strain-relief where the sensor
cable enters an electrical box or enclosure. It is recom-
mended to secure tension on the end of a long sensor
cable run. The connector is designed to thread into a
standard 3/4" cast electrical box opening (3/4” NPT).
Sensor
Cable
Figure 3. Weather-Tight Connector
5. The sensor cable should be protected from mechanical
damage in non-detecting exposed areas by running it
in electrical metallic tubing (EMT). The sensor cable
should also be run in short pieces of EMT where the
sensor cable must pass through walls or partitions. The
ends of the EMT must have non-metallic bushings to
prevent damage to the sensor cable.
6. Selection of the mounting hardware that best suits the
application will depend upon the equipment or support
structures in the area being protected. Environmental
conditions and the practicality of mounting the clips
needs to be taken into consideration. The sensor cable
should always be attached to a support that permits the
least amount of movement, without crushing the cable
insulation. Three types of standard mounting hardware
(master clamp, flange clamp, nylon cable tie) permit
safe, secure sensor cable installation in most
applications.
7. The Master Clamp, P/N 73-117068-022 (box of 100), is
a multi-purpose fastener that fits all beam flanges up to
½” (13 mm) thick and resists vibration. Use the Nylon
Cable Clamp, P/N 73-117068-025 (box of 100) to fas-
ten the sensor cable to the master clamp.
Nylon Cable
Clamp
Sensor Cable
Figure 4. Master Clamp
8. The Flange Clip is available in two sizes. P/N 73-117068-
023 (box of 100) fits up to 3/16" (4 mm) thick metal.
P/N 73-117068-024 (box of 100) fits 3/16" (4 mm) to ¼”
(6 mm) thick metal. They are easily hammered onto
metal flanges on roof trusses and shelving for secure
mounting which resists vibration. Use the Nylon Cable
Clamp, P/N 73-117068-025 (box of 100) to fasten the
sensor cable to both sizes of flange clips.
Nylon
Cable
Clamp
Sensor Cable
Figure 5. Flange Clip
9. The Nylon Cable Tie, P/N 73-117068-020 (box of 100),
is a heavy duty mounting tab cable tie that is strapped
to sprinkler or other fire protection pipes up to 8" (20
cm) in diameter. This method of mounting the LHS
sensor may be used if acceptable to the local AHJ. Use
the Nylon Cable Clamp, P/N 73-117068-025 (box of 100)
to fasten the sensor cable to nylon cable tie.
Sensor Cable
Nylon Cable
Tie
Nylon Cable
Clamp
Pipe
Figure 6. Nylon Cable Tie
CAUTION
!
When the LHS sensor cable is installed in below
freezing environments, special precautions
should be taken to avoid contact with or
movement of the sensor cable. At temperatures
below 32
O
F (0
O
C), the Nylon Cable Tie may break
as a result of jarring or physical contact.
10. Messenger cable must be used if the LHS sensor cable
needs to be suspended for some distance over an object
or an area, without a ceiling to attach the cable to. Com-
mercially available stainless steel cable of a suitable size
should be used as messenger cable, tensioned appropri-
ately. The sensor cable can be attached to the messenger
cable using cable ties, approximately every 3 feet (1 m).
SENSOR CABLE SPLICING
The LHS sensor cable must be spliced or electrically con-
nected in a professional manner, in accordance with any
applicable codes or requirements. The recommended splic-
ing techniques described below do not preclude the use of
alternate means that are more suitable for a specific instal-
lation. Because of the heat-sensitive nature of the sensor
cable insulation, soldering or heat-shrink tubing should never
be used when splicing LHS sensor cable.
Preferred Method - Using a junction box:
The preferred method for joining two lengths of sensor cable,
or for connecting sensor cable to copper lead-in wire, inter-