Det-Tronics U7652B, C Unitized UV/IR Flame Detector - Manual (Page 18)

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9. Perform the “Startup and Checkout Procedure
(Manual
oi Test)” as described in this manual
before returning the system to normal operation.
MAINTENANCE
VIEWING WINDOWS/ oi RINGS
The U7652 Detector requires no periodic calibration.
However, to maintain maximum sensitivity, the detec-
tor viewing windows must be kept clean at all times.
NOTE
Remove input power when cleaning the detector
windows. The rubbing motion on the surface of
the windows during cleaning can create static
electricity that could result in unwanted output
activation.
To clean the optical surfaces, remove the oi rings
from the detector by gently squeezing the tabs
together and then pulling out. Clean the viewing win-
dows and the back side of the
oi rings using a clean
cloth or tissue and Det-Tronics window cleaning solu-
tion. Avoid leaving fingerprints on the reflective sur-
faces of the
oi rings. Re-install the rings so that the
openings are pointed down to prevent a buildup of
contaminants. If corrosive contaminants in the atmo-
sphere 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.
O-RINGS
Rubber O-rings on each of the detector base hous-
ings are used to ensure the watertight integrity of the
detector. Periodically, the housing should be opened
and the O-rings inspected for breaks, cracks, and
dryness. To test them, remove the rings from the
detector housing and stretch them slightly. If cracks
are visible, the ring should be replaced. If they feel
dry to the touch, a thin coating of lubricant should be
applied. When re-installing the rings, be sure that
they are properly seated in the groove on the hous-
ing. It is imperative that these O-rings be properly
installed and in good condition. Failure to maintain
these rings can allow water to enter the detector and
cause premature failure.
Use a silicone free polyalphaolefin grease (available
from Detector Electronics) to lubricate the O-rings. A
thin coating of lubricant should also be applied to the
threads on the sensor housings before reassembling
the detector.
FEATURES
• Detector and controller housed in a single unit.
• Responds to 1 x 1 foot gasoline fire at 50 feet.
• Responds to fire even when UV or IR false alarm
sources are present.
• Relay outputs for fire and fault signals.
• Optional 4 to 20 ma output available.
• Optional auxiliary relay available that responds to
either “UV radiation only” or to “any UV or IR radia-
tion.”
• Optional Data Logger available.
• Selectable latching or non-latching alarm output.
• Selectable 0.5 or 3 second response time.
• LEDs indicate normal operation, fire, fault, UV only
and IR only conditions.
• Selectable automatic and/or manually initiated oi
test.
• Microprocessor controlled.
• Fire and fault algorithms ensure reliability.
• Watchdog timer monitors the operation of the pro-
gram.
• Modular design allows easy field replacement of
sensor modules.
• Surface mount technology printed circuit board
assemblies.
• Suitable for Style D (Class A) wiring.
• RFI/EMI hardened - meets MIL STD 461, 462 and
463.
• Solar blind and immune to most commonly encoun-
tered false alarm sources.
• Explosion-proof enclosure is FM approved, CSA
certified, and CENELEC certified.
SPECIFICATIONS
OPERATING VOLTAGE—
24 volts dc nominal, 18 volts dc minimum to 32 volts
dc maximum.
MAXIMUM RIPPLE—
Ripple should not exceed 5 volts peak to peak. The
sum of dc plus ripple must be ≥18 vdc and ≤32 vdc.
OPERATING POWER—
2.0 watts nominal, 5.0 watts maximum.