Addressability
Device identification is accomplished by setting rocker
switches on an eight position DIP switch (valid address
range is 5 to 250).
Alarm Log
Each detector maintains an alarm log in non-volatile
memory. The time and date for the last 8 alarms are
logged.
Enclosure
The explosion-proof NEMA/Type 4X enclosure is
available in either aluminum or stainless steel and is
designed for use in a variety of hazardous locations.
LEDs
Detector status is indicated by a pair of red LEDs
(illuminated simultaneously) that are visible through the
viewing window of the UV sensor.
Table IV-4 indicates the condition of the LEDs for each
detector status.
Automatic Diagnostics
The microprocessor based detector is equipped with
advanced fault detection and diagnostic capabilities.
The LED indicators on the UV sensor module provide
the user with visual annunciation of the problem area.
In addition, the point display screen at the OIS provides
a variety of information regarding detector status as well
as the actual UV and IR signal levels present at the
detector. Refer to Table IV-5 for a list of status
conditions.
SOFTWARE SELECTABLE OPTIONS
The following options are selectable through a PC
running Det-Tronics configuration software:
Processing Mode
The UV portion of the detector offers a choice of two
different types of logic that can be used for processing
fire signals — either standard or arc rejection.
ARC REJECTION MODE
The arc rejection mode (recommended) enables the
detector to prevent nuisance fire alarms caused by
short-duration electrical arcs or electrostatic discharge,
while maintaining the ability to reliably detect a flame.
The arc rejection mode is not recommended unless
these false alarm sources are present within the
application to be protected. Typical applications that
benefit from arc rejection logic include any uncontrolled
environments where transient radiation sources can be
present, such as many typical outdoor applications.
The arc rejection algorithm examines the radiant energy
level detected within a specified unit of time (timed
gate). The output of the detector is determined by three
variables:
— sensitivity level
— gate length
— number of consecutive gates required.
Different combinations of these variables allow for
various levels of transient arc rejection capability. There
are two arc rejection levels (medium and high) that are
selectable for the detector through the OIS. The proper
arc rejection setting for a given application must be
determined through testing.
IV-5
95-8470
Detector Status
LED
Fault
Off
Automatic
oi
On for 0.25 second every 5 seconds
Manual
oi
On for 0.25 second every 10 seconds
UV only
On for 50 milliseconds — off for 500 milliseconds
IR only
On for 200 milliseconds — off for 500 milliseconds
Alarm
On steady
T0030
Table IV–4—EQ2200UVIR Detector Status/Indications
