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radiation. Check the area for the external source
of UV radiation, and either remove it or shield the
detector from it. If the high count rate continues after
the detector window is covered, this indicates a faulty
module, and it must be replaced. If other detectors in
the vicinity exhibit similar symptoms, the presence of
x-rays or gamma radiation is indicated.
NOTE
If a zone has two detectors, the sum of the two is
displayed.
5. Press the SELECT button to position the next zone for
test.
— The DETECTOR display remains the same until
the ZONE display changes from the lowest to the
highest zone. The DETECTOR display then cycles
from “2” to “1” or “1” to “2.”
6. Repeat the test until all detectors have been checked.
At the completion of the sequence, each detector will
have been tested for the following conditions:
— Influence of background radiation
— Capability of optical surfaces to transmit UV
radiation
— Calibration of UV source/UV detector (these
elements are factory adjusted, but are subject to
influences that may affect the calibration).
— If the system is to be tested for response to an
actual fire, the exact response of each detector
can be measured. If any improvements in system
layout are needed, it will be revealed in this way.
7. After completing the test, return the keylock switch
to the NORMAL position. All LEDs are reset and the
digital displays should become blank.
MaNUaL ChECK IN NORMaL MODE
The whole system should be checked periodically with a
UV test lamp (such as the Det-Tronics model W8066) to
make sure that the detectors are not obstructed, that the
area “seen” by the detector has not changed, and that
there is no fault in the
oi
circuit.
CAUTION
Secure all output loads connected to the controller
outputs to prevent unwanted activation.
1. Place the keylock switch in the NORMAL position.
2. Shine the UV test light into a detector viewing
window.
— The corresponding ZONE LED turns on and
flashes, indicating the zone in which the detector
is located. The upper display shows the first zone
activated. The lower display shows a “6.”
— The appropriate FIRE LOGIC LED(s) turns on if
voting requirements are met.
3. Turn off the UV source.
— FIRE LOGIC LED(s) stays on (if illuminated).
— ZONE LED stays on but stops flashing. The
numeral indicating the first zone to respond to the
UV signal is shown in the upper display, and the
numeral “6” remains in the lower display.
4. Repeat the test for all detectors in the system.
5. After all detectors have been checked, reset the
system by turning the keylock switch to the RESET
position, then turn it to the NORMAL position.
6. Restore power to output loads or remove any
mechanical blocking devices.
MAINTENANCE
The detector requires no periodic calibration. However,
to maintain maximum sensitivity, the viewing windows
should be cleaned on a regular basis. The length of
time between periodic cleanings will be determined by
the nature and amount of contaminants present in the
environment.
Remove the
oi
ring from the detector and clean the viewing
window thoroughly, all the way to the edge. Also clean the
oi
ring. When re-installing the reflective ring, hold it by its
tabs to avoid leaving fingerprints on the reflective surface.
Re-install the rings so that the split is 180 degrees from
the
oi
test lamp on the UV detector (opening down to
prevent water buildup). If corrosive contaminants in the
atmosphere cause the reflective rings to deteriorate to the
extent that it is no longer possible to restore them to their
original condition, they must be replaced.
Use a clean cloth or tissue to clean the window and
oi
ring. DO NOT use commercial glass cleaning tissues.
Many of these contain a silicone substance that remains
on the cleaned surface and will absorb radiation.
