Det-Tronics C7050 A, C, G, P UV Flame Detector - Manual (Page 23)

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 view-
ing 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 (open-
ing down to prevent water buildup). If corrosive contami-
nants in the atmosphere cause the reflective rings to dete-
riorate 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.
Det-Tronics window cleaning solution (part number
001680-001) is designed specifically for cleaning the
optical surfaces of the detector. Avoid the use of com-
mercial cleaners, since many of them can leave a UV
absorbing residue on the surface.
NOTE
Remove power to the controller or switch the unit to
the Test mode when cleaning the detector windows
to avoid the possibility of false actuation.
Rubber O-rings are used on the detector housings to
ensure the watertight integrity of the detector. The hous-
ings should be opened periodically and the O-rings
inspected for breaks, cracks, or dryness. To test them,
remove the O-rings from the detector housing and
stretch them slightly. If cracks are visible, the O-ring
should be replaced. If they feel dry to the touch, a thin
coating of lubricant should be applied. When re-
installing the O-rings, be sure that they are properly seat-
ed in the groove on the housing.
It is imperative that these O-rings be properly installed
and in good condition. Failure to properly maintain these
rings can allow water to enter the detector and cause
premature failure. The life expectancy of rubber O-rings
can vary considerably, depending on the amount and
nature of contaminants that are present in the environ-
ment. The person responsible for maintenance of the
system must rely on experience and common sense to
determine how frequently the rings should be inspected.
A coating of lubricant should also be applied to the
threads on the detector enclosure before reassembling
the detector. This will both lubricate the threads and help
to prevent moisture from entering the detector housing.
CAUTION
The O-ring should be lubricated with polyal-
phaolefin grease, such as GRS-450 made by CPI
Engineering. Silicone based lubricants should
never be used if catalytic type combustible gas
sensors are being used in conjunction with the UV
detectors, since inadvertent use of a silicone lubri-
cant on or near the combustible gas sensor will
cause irreversible damage to the sensing element.
A test form is supplied at the rear of this manual for
recording maintenance performed on the system.
TROUBLESHOOTING
The Automatic oi feature continuously checks the sys-
tem for various faults that can occur. If a fault should be
detected, the FAULT LED will turn on. If the fault is in the
detector or wiring, the upper displays will indicate which
zone and detector is affected. The lower display will
indicate by code number the type of fault. If the fault is
in the microprocessor circuitry, the FAULT LED will turn
on, but the displays will remain blank. See Table 5 for a
detailed explanation of the status/fault code numbers on
the lower digital display, and the corresponding detector
identification numbers on the upper digital display.
The R7404 is not designed to be repaired by the customer
in the field. If a problem should develop, first carefully
check for proper wiring and programming. If it is deter-
mined that the problem is caused by an electrical mal-
function, the unit must be returned to the factory for repair.
Record all faults on the Fault Record Sheet at the back of
this manual.
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