Spectrex 20/20L (LB) - UV/IR Flame Detector - Manual (Page 23)

Spectrex Inc. - SharpEye TM UV/IR Flame Detector Manual – TM20/20LB Rev E, August 2004
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4.4 Detector States
The detector can be in one of the following states:
Normal:
The detector is functioning.
BIT: The detector performs a BIT.
IR Detection: IR sensor is in Detection level.
UV Detection: UV sensor is in detection level.
Warning: The detector detects a fire and changes into its warning-pre-
alarm state.
Alarm: The detector detects a fire and changes into fire alarm state.
Latched Alarm: The alarm outputs are latched after Alarm state due to the
detection of a fire even when the fire 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 6.
Table 6. Output Signals Versus Detector State
Detector
State SW1 Yellow
LED Red
LED Alarm
Relay Accessory
Relay Fault
Relay 4-20mA
Output
Fault 2Hz OFF OFF OFF OFF 0mA
BIT Fault 2Hz OFF OFF OFF OFF 2mA
Normal
0.5HZ OFF OFF OFF ON 4mA
IR
Detection
only 0.5HZ OFF OFF OFF ON 8mA
UV
Detection
only 0.5HZ OFF OFF OFF ON 12mA
Warning
SW1-4 on 0.5Hz 2Hz OFF ON ON 16mA
Alarm 0.5Hz ON ON * ON 20mA
Latch SW1-1 on 0.5Hz ON ON * ON 20mA
Warning
at BIT
Fault
2Hz 2Hz OFF ON OFF 16mA
Alarm at
BIT Fault 2Hz ON ON * OFF 20mA
* Depends on SW 1 -4 set.