3
95-8576
3.3
Magnetic
oi
/ Manual
oi
The detector also incorporates both magnetic
oi
and
manual
oi
features that provide the same calibrated test
as the automatic
oi
, and in addition actuates the Alarm
relay to verify output operation for preventive maintenance
requirements. These features can be performed at
any time and eliminate the need for testing with a non-
calibrated external test lamp.
CaUtIon
These tests require disabling of all extinguishing
devices to avoid release resulting from a
successful test.
The magnetic
oi
test is performed by placing a magnet by
the marked location (mag
oi
) on the outside of the detector.
The manual
oi
test is accomplished by connecting the
oi
lead (terminal 22) to power supply minus via an external
switch. The magnet or switch must be held in place for
a minimum of 6 seconds to complete the test. Either of
these test methods activates the calibrated IR emitters.
If the resulting signal meets the test criteria, indicating
that greater than half of the detection range remains, the
Alarm relay changes state, the indicating LED changes
to red, and the 4-20 mA current output goes to 20 mA.
This condition remains until the magnet is removed or the
switch is released, regardless of whether the relays are
set for latching or non-latching operation
If less than half of the detection range remains, no alarm
is produced and a fault is generated. The fault indication
can be reset by momentarily applying the magnet or
manual
oi
switch.
NOTE
Refer to the Appendix for FM verification of
Det-Tronics’ Optical Integrity
oi
function.
COMMUNICATION
The X3302 is furnished with an RS-485 interface for
communicating status and other information with external
devices. The RS-485 supports MODBUS protocol, with
the detector configured as a slave device.
NOTE
The EQP model uses LON/SLC communication.
RS-485 communication is not available on the
EQP model.
DATA LOGGING
Data logging capability is also provided. Status conditions
such as normal, power down, general and
oi
faults, pre-
alarm, fire alarm, time and temperature are recorded.
Each event is time and date stamped, along with the
temperature and input voltage. Event data is stored in
non-volatile memory when the event becomes active,
and again when the status changes. Data is accessible
using the RS-485 port or the EQP controller.
INTEGRAL wIRING COMpARTMENT
All external wiring to the device is connected within
the integral junction box. The screw terminals accept
wiring from 14 to 24 AWG. The detector is furnished with
four conduit entries, with either 3/4 inch NPT or 25 mm
threads.
GENERal aPPlICaTION
INfORmaTION
RESpONSE ChARACTERISTICS
Response is dependent on distance, type of fuel,
temperature of the fuel, and time required for the fire to
come to equilibrium. As with all fire tests, results must be
interpreted according to an individual application. See
Appendix for fire test results.
IMpORTANT AppLICATION CONSIDERATIONS
In applying any type of sensing device as a fire detector,
it is important to know of any conditions that can prevent
the device from responding to fire, and also to know
what other sources besides fire can cause the device to
respond.
welding
Arc welding should not be performed within 20 feet of
the detector. Gas welding mandates system bypass,
since the gas torch is an actual fire. Arc welding rods
can contain organic binder materials in the flux that burn
during the welding operation and are detectable by the
X3302. Welding rods with clay binders do not burn and
will not be detected by the X3302. However, system
bypass is always recommended, since the material being
welded may be contaminated with organic substances
(paint, oil, etc.) that will burn and possibly trigger the
X3302.
Artificial Lighting
The X3302 should not be located within 3 feet of artificial
lights. Excess heating of the detector could occur due to
heat radiating from the lights.
