3
95-8549
8.3
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 UV emitter.
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 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 magnet or
manual
oi
switch.
NOTE
Refer to Appendix A for FM verification of
Det-Tronics’ Optical Integrity
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.
NOTE
The EQP model uses LON/SLC communication.
RS-485 communication is not available on the
EQP model.
DATA LOGGING / EVENT MONITORING
Data logging for event monitoring capability is also
provided. The detector can log up to 1500 events
(up to 1000 general and 500 alarm events). 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.
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 (Recommended Factory Setting)
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 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.
