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EXP-SD-SFC-120V-V1
Larson Electronics, LLC
Phone: (800) 369-6671
Fax: (903) 498-3364
www.larsonelectronics.com
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of
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Table 1-Detector Status Conditions Indicated by Current L�vel
Current Level (:1:0.3 mA)
Detector Status
0 mA
Power Fault
1 mA
Critical Fault
3mA
Warm up
4 mA
Normal
6mA
Advisory Fault
16mA
Pre-Alarm
20 n:A
Smoke Alarm
NOTE
The output of the
O
to
20
mA current loop is monitored by the
fault detection circuitry of the
EXP-SD-SFC-120V-V1
.
Therefore, an open circuit on the loop will cause the fault relay
to change state.
An alarm will normally override a fault, unless
the nature of the fault impairs the ability of the detector to generate or
maintain an alarm
output (i.e., loss of operating power)
INTEGRAL WIRING COMPARTMENT
All external wiring to the device is connected within the integral junction box. The detector is furnished with a maximum of four conduit
entries, with either 3/4 inch NPT or M25 threads.
LED
An LED, located on the detector (see Figure 1 ), indicates normal operation and notifies personnel of an alarm. Table 2 indicates t(le
condition of the LED for each status.
Table 2-Detector Status Indicator
Detector Status
LED Indicator
Power On/
Normal Operation
Steady Off
1 blink on every 4 seconds
Alarm
Steady On
LATCHING
A detector configured for latching operation will remain in an alarm state indefinitely, after an alarm occurs.
NON-LATCHING
A detector configured for non-latching operation
will check the alarm status of the detector once every 1 O seconds. Once smoke falls
below the alarm threshold, the alarm annunciation will clear within 10 seconds.
IMPORTANT
The latching or non-latching configuration must be specified during order placement. It is
not
field configurable.
Only the alarm annunciation can be configured for latching operation.
CONTINUOUS SELF-TEST
During normal operation, the detector performs the Self-Test function automatically in the background once per second. During
the test, detection is not interrupted and no indication is given if the test passed. If the test fails, a critical fault will occur. If
degradation is present and
approaching critical levels, an advisory fault will occur.