Det-Tronics R7495D UV/IR Flame Detection System User Manual

Page 16

10. If the IR sensors are the DE3895 type that electrical-

ly connects directly onto the terminal block, install
them by lining up the connection pins using the
index pin to properly orient the module. Press the
sensor firmly into place.

11. If the IR sensor is the DE5500 type that connects

via a wire harness (Figure 17), thread the wire leads
and keyed connector plug through the slotted
opening on the side of the IR module. Plug the IR
module into the two banana plugs inside the junc-
tion box cover. If repositioning is necessary to
properly align the oi lamps (as described in the
“NOTE” below), this module can be rotated 180°
and remounted on the banana plugs.

NOTE

The two

lamps on the DE5500 IR sensor should

be at the top or side of the detector (when viewed
from the front) and the opening on the

ring

should be at the bottom. See Figure 10. This will
ensure proper operation of the

system and also

minimize the accumulation of moisture and con-
taminants between the

ring and the viewing win-

dow. (The

lamps on the IR sensor are identified

as oblong in shape and clear in color.)

12. Connect the keyed connector plug to the 4-pin con-

nector on the DE5500 IR module. Tuck the lead-
wires inside the module to prevent binding or wire
damage when installing or removing the sensor
housing.

13. Check the O-rings on both sensor housings to be

sure that they are in good condition and are fitted
properly, then re-install the sensor housings on the
junction box cover. (See the “Maintenance” section
of this manual for information regarding care of O-
rings.) The sensor housing with the large viewing
window is for the UV detector and the sensor hous-
ing with the small window is for the IR detector.
Hand tighten the sensor housings into the base until
the O-rings are fully seated to maintain the explo-
sion-proof and watertight integrity of the housing. If
the unit is equipped with cover locking clamps,
loosen the clamps sufficiently so that the clamp
catches can be seated in the blind holes on the
junction box cover. Fasten the clamps securely
using a 5/32 inch hexagonal (Allen) wrench. (See
Figure 15.)

14. Re-install the junction box cover, making sure that

the center nine-pin connector on the cover is prop-
erly aligned with the connector in the junction box.
The six screws must be tight to ensure a metal to
metal fit to maintain explosion-proof and watertight
integrity of the junction box.

15. Inspect and clean (if necessary) the detector view-

ing windows and oi rings by following the instruc-
tions in the “Maintenance” section of this manual.

16. The opening of the oi rings should be pointed down

to minimize the accumulation of moisture or con-
taminants behind the ring (see Figure 10). Verify
that the oi test lamp is at the top or side of each
sensor. Note that Figure 10 shows the DE5500 IR
module with the test lamps located together on one
side of the edge. The DE3895 IR module has test
lamps located directly opposite one another. In
both cases, ensure that no test lamp is positioned
at the bottom when the detector is installed.

Figure 16—Jumper Plug

JUMPER "J"

A1702

A1331

IR MODULE

4–WIRE CONNECTOR PLUG

Figure 17—IR Module with Four-Wire Connector