Spectrex 20/20R - Single IR Flame Detector - Manual (Page 17)

Spectrex Inc. - SharpEye TM Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
9
4.2 Output Signals
The detector controls the following outputs:
• Alarm relay
• Accessory relay
• Fault relay
• 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 - changed to warning – pre-alarm state.
Alarm: Fire detected - changed to fire alarm state.
Latched Alarm
(Optional)
The alarm outputs are latched due to the detection of a fire that
has already been extinguished.
Fault: A fault is detected during a BIT sequence or the power supply is
too low. In each state the detector will activate different outputs
as specified in table 5.
Table 4: Output Signals Versus Detector State
Detector
State SW1 Power
Led Alarm
Led Alarm
Relay Accessory
Relay Fault
Relay 4-20mA
Output
Normal On Off Off Off On 5mA
Warning
Sw1-2 ON On Flash
2Hz Off On On 10mA
Alarm On On On On On 15mA
Latch
Sw1-1 ON On Off On Off On 5mA
Fault Flash
4Hz
Off Off Off Off 0mA
• The detector will be in its FAULT state until it has passed a successful BIT.
• When SW1-2 is OFF, WARNING state is the same as the ALARM state.
• The alarm outputs will be activated as long as the alarm conditions are present
and will stop approximately 5 seconds after the fire is no longer detected.