Spectrex 20/20MI - Mini Triple IR (IR3) Flame Detector - Manual (Page 23)

Spectrex Inc. - SharpEye TM Mini IR3 Flame Detector Manual – TM 787100, Rev. D April 2011
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4.2 Output Signals
The detector controls the following outputs:
• Alarm relay (this output is not available in the ATEX certified model
20/20MI-XX-X-C)
• Fault relay (this output is not available in the ATEX certified model 20/20MI-
XX-X-C)
• 4-20mA current output
• RS-485 communication
The detector can be in one of the following states.
Normal:
The detector is functioning normally.
BIT: The detector performs a Built In Test.
Warning: Fire detected – warming alarm (pre-alarm) state
Alarm: Fire detected – fire alarm state
Latched Alarm
(Optional) The alarm outputs are latched due to the detection of a fire
that has already been extinguished.
BIT Fault: A fault is detected during BIT sequence. The detector will
continue to detect fire if the alarm conditions occur.
Fault: A fault is detected when the power supply is too low or
during a software fault.
In each state, the detector will activate different outputs as specified in table 8.
Table 8: Output Signals versus Detector State
Detector
State Color LED Flashing
LED
Alarm
Relay
Fault Relay 4-20mA
Output
Normal Green 1 Hz Off On 5 mA
Warning Red 2 Hz Off On 10 mA
Alarm
(1)
Red Steady On On 15 mA
Latch
(2)
Red Steady On On 15 mA
BIT Fault
(3)
Yellow 4 Hz Off Off 2 mA
Warning at
BIT Fault Red 2 Hz Off Off 10 mA
Alarm at
BIT Fault Red Steady On Off 15 mA
Fault Yellow 4 Hz Off Off 0 mA
Notes:
1 The alarm outputs will be activated as long as the alarm conditions are present
2 The Alarm state can be latched (optional) according to programmable function
3 The detector will be in its BIT FAULT state until it has passed a successful BIT
and will stop approximately 3 seconds after the fire is no longer detected.