WARNING
Do not open the detector assembly in a haz-
ardous area when power is applied.
CAUTION
1.
The wiring procedures in this manual are
intended to ensure proper functioning of
the device under normal conditions.
However, because of the many variations in
wiring codes and regulations, total compli-
ance to these ordinances cannot be guar-
anteed. Be certain that all wiring complies
with applicable regulations that relate to the
installation of electrical equipment in a haz-
ardous area. If in doubt, consult a qualified
official before wiring the system.
2.
The U7652 contains semiconductor devices
that are susceptible to damage by electro-
static discharge. An electrostatic charge
can build up on the skin and discharge
when an object is touched. Therefore, use
caution when handling the detector, taking
care not to touch the terminals or electronic
components. Observe the normal precau-
tions for handling electrostatic sensitive
devices.
3.
To minimize the risk of damage, handle the
electronic module by the protective cover
only. Do not touch the connector, circuit
board, or electronic components.
4.
Alarm and extinguishing devices should be
disconnected before performing the manual
oi
test.
DESCRIPTION
The U7652 UV/IR Flame Detector is an explosion-
proof device that consists of a UV sensor and an IR
sensor mounted side-by-side on a junction box. This
mounting arrangement allows both sensors to monitor
the same hazardous location with a 90 degree cone
of vision.
A pair of red LEDs is located inside each sensor view-
ing window (four LEDs per U7652 Detector). The two
LEDs for each sensor are illuminated simultaneously
to provide visual annunciation of detector status con-
ditions such as normal operation, fire, fault, UV only,
and IR only conditions.
When both sensors simultaneously detect the pres-
ence of fire, a fire signal is generated which then
actuates a Fire relay and illuminates the sensor LEDs.
Table 1 indicates the condition of the Fire relay, Fault
relay, and LEDs for each detector status.
INSTRUCTIONS
Unitized UV/IR
Flame Detector
U7652
©
Detector Electronics Corporation 2001
3/01
95-8385-06
DET
-
TRONICS
®
*
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is Detector Electronics' Trademark for its patented Optical
Integrity Systems, U.S. Patent 3,952,196, United Kingdom Patent
1,534,969, Canada Patent 1,059,598.
