
395-854915.1
Magnetic
oi
/ Manual
oi
The detector also incorporates both Magnetic
oi
(Mag
oi
) and Manual
oi
(Man
oi
) features that
provide the same calibrated test as the Automatic
oi
, and in addition actuates the Alarm output to verify
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 Mag
oi
test is performed by placing a magnet
at the location marked "MAG OI" on the outside
of the detector (see Figure 2). The Man
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 UV emitter.
If the
resulting signal meets the test criteria, indicating that
greater than half of the detection range remains, the fire
alarm output of the detector is activated. This condition
remains until the magnet is removed or the switch is
released, regardless of whether the detector has been
configured 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 Mag
oi
or Man
oi
switch. In this case, the detector's optics should be
cleaned and the
oi
tests should be repeated. See the
"Cleaning Procedure" section of this manual for details.
NOTE
Refer to Appendix A for FM verification of
the
oi
function.
COMMUNICATION
The X2200 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.
For HART communication, connect a HART communicator
across a 250 ohm resistor in the 0-20 mA loop.
NOTE
The EQP model uses LON/SLC communication.
RS-485 and HART communication are not
available on the EQP model.
DATA LOGGING
Data logging capability is also provided. Status conditions
such as normal, power down, general and oifaults, 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 Inspector Connector accessory, RS-485, or the
EQP Controller.
INTEGRAL WIRING COMPARTMENT
All external wiring to the device is connected within
the integral junction box. The detector is furnished with
four conduit entries, with either 3/4 inch NPT or M25
threads.
SIGNAL PROCESSING OPTIONS
The UV detector output (measured in counts per second)
is compared to the fire threshold (the "sensitivity" setting).
If the radiant energy level from the fire exceeds the
selected alarm threshold level, the fire alarm output is
activated. In every application, it is crucial to ensure that
the radiant ultraviolet energy level from the expected fire
at the required distance from the detector will exceed the
selected sensitivity level.
The UV detector in the X2200 can be programmed for:
– Arc Rejection
– Standard Signal Processing
Arc Rejection
The Arc Rejection mode enables the detector to
prevent nuisance fire alarms caused by UV from short-
duration electrical arcs or electrostatic discharge,
while maintaining the ability to reliably detect the UV
radiation given off by a flame. Typical applications that
benefit from arc rejection logic include electrostatic
coating processes and uncontrolled environments where
transient UV sources can be present, such as many
typical outdoor applications. Most false alarm sources
have short transient UV signatures, while fire creates
a long UV signature over many seconds. Most fires
are detected in a few seconds (see response times in
Appendix A).
Standard Signal Processing
Standard signal processing is recommended for high-
speed suppression systems only. To allow for high-speed
operation, the standard processing mode does not
incorporate the arc rejection programming. This mode
should only be used in a controlled, indoor environment.