Det-Tronics C7050 A, C, G, P UV Flame Detector - Manual (Page 22)

DETECTOR COUNT TEST
1. Place the keylock switch in the TEST position.
— The SYSTEM STATUS display shows the number
“1.”
— The upper displays show the detector and zone
that are electrically positioned for test. If the
desired detector and zone are not displayed,
press the SELECT button until the appropriate
numerals appear on the upper display.
2. Press and release the SELECT and TEST/ACCEPT
buttons at exactly the same time.
— SYSTEM STATUS display changes to an “8.”
— Upper display does not change.
3. Press and hold the TEST/ACCEPT button.
— The UV source tube in the detector under test
turns on.
— The upper displays indicate the discharge rate of
the UV sensor under test. If the FIRE LOGIC LEDs
turn on, multiply the displayed count by 10. If the
count rate does not fall within the 50 to 300 range,
clean the detector viewing window and the
oi
reflector ring, then test again. If cleaning does not
solve the problem, replace the
oi reflector ring.
Make sure that the slot is positioned at the bottom
of the detector and away from the source tube.
NOTE
During normal operation, tube modules should be
replaced only if a “2” fault occurs and cannot be
remedied following the above procedure.
4. Release the TEST/ACCEPT button. The upper
displays now indicate the quiescent state of the
detector tube. The count should be between 0
and 5. If higher, place an obstruction (cardboard
or similar material) over the detector window. If
the count rate returns to the 0 to 5 range, the
detector has been responding to external radia-
tion. Check the area for the external source of UV
radiation, and either remove it or shield the detec-
tor 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 indi-
cated.
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 con-
ditions:
— Influence of background radiation
— Capability of optical surfaces to transmit UV radi-
ation
— Calibration of UV source/UV detector (these ele-
ments 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 flash-
es, 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.
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