95-8704
2
2.7
0 to 20 mA Output
A 0–20 mA output is available as an option (in
addition to the three relays). This option provides
a 0–20 mA dc current output for transmitting
detector status information to other devices. The
circuit can be wired in either an isolated or non-
isolated configuration and can drive a maximum
loop resistance of 500 ohms from 18 to 19.9 Vdc
and 600 ohms from 20 to 30 Vdc. Table1 indicates
the detector status conditions represented by the
various current levels. The output is calibrated at
the factory, with no need for field calibration. A
model with relays and 0–20 mA with HART is also
available. Refer to Addendum number 95-8577
for complete details.
NOTE
The output of the 0–20 mA current loop is
not monitored by the fault detection circuitry
of the X3301. Therefore, an open circuit on
the loop will not cause the fault relay to
change state or the detector status LED
to indicate a fault. The status of the LED
always follows the status of the relays.
An alarm condition will normally over-ride a fault
condition, unless the nature of the fault condition
impairs the ability of the detector to generate or
maintain an alarm output, i.e., loss of operating
power.
LON/SLC Output
The EQP model is designed for use exclusively
with the Det-Tronics Eagle Quantum Premier
system. The detector communicates with the
system controller over a digital communication
network or LON/SLC (Local Operating Network
/ Signaling Line Circuit). The LON/SLC is a fault
tolerant, two wire digital communication network
arranged in a loop configuration. Analog and
relay outputs are not available on this model.
LED
A tri-color LED on the detector faceplate indicates
normal condition and notifies personnel of fire
alarm or fault conditions. Table 2 indicates the
condition of the LED for each status.
o
i
(OPTICAL INTEGRITY)
Automatic
o
i
The X3301 includes the Automatic
o
i
feature — a
calibrated performance test that is automatically
performed once per minute to verify complete
detector operation capabilities. No testing with
an external test lamp is required. The detector
automatically performs the same test that a
maintenance person with a test lamp would
perform — once every minute, 60 times per hour.
However, a successful Automatic
o
i
test does not
produce an alarm condition.
The detector signals a fault condition when less
than half of the detection range remains. This is
indicated by the Fault output and is evident by the
yellow color of the LED on the face of the detector.
The
o
i
fault condition is self-clearing if the optical
contamination is temporary. If the contamination
is not automatically cleared and the
o
i
fault
remains, the detector may require cleaning or
service. See the "Troubleshooting" section for
further information.
Magnetic
o
i
/ Manual
o
i
The detector also incorporates both Magnetic
o
i
(Mag
o
i
) and Manual
o
i
(Man
o
i
) features
that provide the same calibrated test as the
Automatic
o
i
, 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.
Table1—Detector Status Conditions Indicated by Current Level
Current Level (±0.3 mA) Detector Status
0 mA Power Fault
1 mA General Fault
2 mA
o
i
Fault
3 mA High Background IR Fault
4 mA Normal Operation
20 mA Fire Alarm
Table2—Detector Status Indicator
Detector Status LED Indicator
Power On/Normal Operation
(no fault or fire alarm)
Green
Fault Yellow
Fire (Alarm) Red
Low Sensitivity
One Yellow Flash
During Power-up
T-Low Sensitivity
Three Yellow Flashes
During Power-up
Medium Sensitivity
Two Yellow Flashes
During Power-up
Very High Sensitivity
Four Yellow Flashes
During Power-up
NOTE: See "Detector Sensitivity Levels" for additional information.
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