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1.5.6 DETECTOR
STATUS
The possible detector function statuses are listed in Table 8. A more detailed fault
analysis can be seen via HART or RS485.
Table 8: Detector Status
Status
Description
Normal Normal
operation.
BIT
Built-In-Test being performed.
Warning
Fire detected - changed to Warning (pre-alarm state).
Alarm
Fire detected - changed to Fire Alarm state.
Latched Alarm
(Optional)
The alarm outputs remain latched on following detection of a fire
that has already been extinguished.
BIT Fault
A fault is detected during BIT sequence or other electric failure.
The detector will continue to detect for fire.
Fault
A fault is detected when the power supply is too low or due to a
software fault or electrical failure. The detector will
NOT
detect fire
in this condition.
In each state, the detector activates different outputs, as specified in
Table 9.
Table 9: Output Signals versus Detector State
Detector
State
LED
Indicator
LED
Mode
Alarm
Relay
Auxiliary
Relay
Fault
Relay
mA
output
Normal Green
1Hz
Off
Off
On
4
mA
Warning Red
2Hz
Off
On
(4)
On 16
mA
Alarm
(1)
Red
Constant
On
On
On
20
mA
Latch
(2)
Red
Constant
On
Off
On
20
mA
On
(4)
On 20
mA
BIT Fault
(3)
Yellow 4Hz Off Off Off 2
mA
Warning at
BIT Fault
Red 2Hz Off On
(4)
Off 16
mA
Alarm at BIT
Fault
Red Constant
On
On
Off 20
mA
Fault Yellow
4Hz
Off
Off
Off
0
mA
Notes:
1
The alarm outputs are activated while alarm conditions exist and will stop
approximately 5 seconds after the fire is no longer detected.
2
The Alarm state can be optionally latched via programmed function. (Default is non-
latching).
3
The detector will remain in BIT Fault state until it has passed a successful BIT.
4
The Auxiliary Relay can be activated at the Warning level or Alarm level, depending
on programmed function.
5
The outputs depend on the wiring options.
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