TM 40/40M, Rev (14) February 2017
Performance Considerations
29
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 RS-485.
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, due
to a software fault, or due to an 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
4mA
Warning
Red
2Hz
Off
On
(4)
On
16mA
Alarm
(1)
Red
Constant
On
On
On
20mA
Latched
(2)
Red
Constant
On
Off
On
20mA
On
(4)
On
20mA
BIT Fault
(3)
Yellow
4Hz
Off
Off
Off
2mA
Warning at
BIT Fault
Red
2Hz
Off
On
(4)
Off
16mA
Alarm at
BIT Fault
Red
Constant
On
On
Off
20mA
Fault
Yellow
4Hz
Off
Off
Off
0mA
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-latched).
