Det-Tronics C7052J UV/IR Flame Detector used with R7494, R7495 Controller - Manual (Page 10)

oi RING OPENING DOWN
CONDUIT SEAL REQUIRED WITHIN 18 INCHES
OF DETECTOR. DETECTOR MUST BE ORIENTED
WITH CONDUIT ENTRY AT BOTTOM OR SIDE TO
ELIMINATE DRAINAGE INTO JUNCTION BOX.
* oi TEST LAMPS AT TOP OR SIDE
LED (2)
oi TEST LAMP
*oi TEST LAMP (2)
LED (2)
IR SENSOR HOUSING
UV SENSOR HOUSING
A1327
used, the seal must be located between the swivel and
the detector. When an explosion-proof installation is
required, an additional seal must also be installed at
any point where the conduit enters a non-hazardous
area. When pouring a seal, the use of a fiberdam is
required to assure proper formation of the seal. The
seals should never be poured in temperatures that are
below freezing, since the water in the sealing com-
pound will freeze and the compound will not dry proper-
ly. Contamination problems can then result when tem-
peratures rise above the freezing point and the com-
pound thaws. The shielding of the cable should be
stripped back to permit the seal to form around the indi-
vidual leads, rather than around the outside of the
shield. This will prevent any siphoning action that might
occur through the inside of the shield. The electrical
continuity of the shield must be maintained through the
seal via the shield drain wire.
Moisture in the air can be trapped within sections of
conduit and can condense and accumulate at the base
of vertical conduit runs. To eliminate this condition,
explosion-proof drains and breathers should be
installed to automatically bleed off accumulated water.
It is recommended that the detector be oriented with the
conduit opening at the bottom or at either side of the
device. This will reduce the possibility of moisture
entering the junction box through the conduit entry and
also ensure that the
oi test lamps are not in a position
that would make the detector overly susceptible to oi Oi
faults. Whenever possible, slope the conduit run down-
ward from the detector. Do not use conduit runs that
enter the device from the top. See Figure 10 for identifi-
cation of the detector parts of interest when mounting,
and Figure 11 for an example of vertical detector mount-
ing.
Detector Mounting and Wiring Procedure
The following procedure should be used for mounting
and wiring the C7052J.
1. Detectors should be located in positions best suited
for covering the area to be protected. Whenever
practical, they should be placed where they will be
easily accessible for cleaning and other periodic
servicing. Particular attention should also be paid
to potential false alarm sources within the cone of
vision of the detector, such as distant arc welding,
rotating fan blades, surface vibration of an IR
source, and movement of people or machines
between the detector and an IR source, all of which
could allow a flickering IR signal to reach the detec-
tor. Rain or ice can absorb radiation, which can
reduce the capability of the detector. For outdoor
applications, aim the detector downward to mini-
mize the buildup of water or ice on the detector
viewing windows and to prevent the cone of vision
from scanning the horizon. This minimizes
response to distant radiation sources outside the
protected area.
10
Figure 10—Front View of the C7052J Detector