Det-Tronics X2200 UV Flame Detector - Manual (Page 5)

3 95-8549 13.1
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 Alarm output changes state, the indicating LED
changes to red, and the 0-20 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
Mag
oi or Man oi switch.
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
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 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.