Det-Tronics U7602E Unitized UV Flame Detector/Controller - Manual (Page 13)

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leave a UV absorbing residue on the surface of the
window. Avoid leaving fingerprints on the reflective
surface of the
oi ring. Re-install the ring so that the
opening is positioned downward.
NOTE
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.
To ensure the watertight integrity of the detector
housing, the O-rings must be in good condition.
Periodically, the housing should be opened and the O-
rings inspected for breaks, cracks, or dryness. To test
the O-rings, remove them from the detector housing and
stretch them slightly. If cracks are visible, they should
be replaced. If they feel dry to the touch, a thin coating
of silicone-free grease should be applied. When re-
installing the O-rings, be sure that they are properly
seated in the grooves on the housing.
Before re-assembling the detector, apply a thin coating
of silicone-free grease to the threads on the detector
enclosure. This will both lubricate the threads and help
to prevent moisture from entering the detector housing.
REPLACING A DETECTOR MODULE
1. Remove power from the detector and relay
contacts.
2. Remove the appropriate section of the sensor
housing (see Figure 2).
3. Remove the existing module and install the new
module. When replacing an electronic module,
note the settings of all switches on the electronic
module being replaced, then duplicate those
settings on the replacement module. The electronic
module is secured inside the housing using three
captive screws.
4. Check the condition of the O-ring, then replace the
sensor housing.
5. Inspect the viewing window and oi ring and clean if
necessary.
6. Perform the “Startup Procedure” as described in
this manual before returning the system to normal
operation.
FEATURES
• Long detection range to gasoline fires.
• Selectable automatic or manual oi .
• Fire and fault relays standard.
• Easily visible LEDs indicate normal operation, fire and
fault conditions.
• Adjustable sensitivity and time delay for fire output.
• High-speed capability.
• Selectable latching or non-latching for fire and fault
outputs.
• Programmable for arc rejection or standard signal
processing method.
• Microprocessor based circuitry.
• Optional swivel mounting bracket for ease of
installation and positioning.
• Optional Data Logger available.
• Operates under adverse weather conditions and in
dirty environments.
• Space provided for installation of addressable
interface devices.
• EMI hardened.
• Explosion-proof/flame-proof detector housing
designed to meet CENELEC, FM and CSA
requirements.
SPECIFICATIONS
OPERATING VOLTAGE—
24 vdc nominal (18 vdc minimum, 32 vdc maximum).
POWER CONSUMPTION—
2.0 watts typical, 4.0 watts maximum during
oi test, 7.0
watts maximum when end of line components are
installed.
OUTPUT RELAYS—
The Fire Alarm relay is Form C (N.O. and N.C. contacts
available), nor mally de-energized and field
programmable for either latching or non-latching
operation. The Fault relay is normally energized. The
Fault relay contacts are normally closed when power is
applied and no faults are present. Relay contacts are
rated for 5 amperes at 30 vdc.