SST F120 - False Alarms

120-60 January, 2016
Model F120 UV/IR Flame Detector
False Alarms
Location and Orientation of the Detector
The ame detector has been designed to reduce or eliminate instances of false alarms. In
some cases, the ame detector may be picking up other sources of false alarms because it
is positioned incorrectly.
Consider limiting the eld of view of the detector to the intended area which requires protection
or monitoring. SEE “Selecting a Location for the Flame Detector” section of the manual on
how to best position the ame detector to ensure trouble-free operation.
In addition, increase the time delay setting of the Delayed Alarm from 3 seconds (default
factory setting) to 6 seconds. The increased time will allow the detector to discriminate
against false alarm sources.
Vibration
Mounting location should be as free from shock and vibration as possible. Due to the high
sensitivity of the ame detector, it must be mounted to a rigid, stable support where no
vibration is present.
Severe Lightning
Lightning produces the same UV and IR radiation that a ame does. Extended periods of
lightning strikes may trigger the ame detectors due to the intensity of the UV it generates.
Consider changing the time delay of the Delayed Alarm from 3 seconds (default factory
setting) to 6 seconds.
To change the Time Delay for the Delayed Alarm Output, follow the table below to adjust
the DIP Switch settings.
Switch # 3 Description
DOWN Sets the Delayed Alarm at 3 seconds (Default Setting)
UP Sets the Delayed Alarm at 6 seconds
If the detector continues to report signicant false alarms due to lightning, consider turning
off the UV sensor and change the detection mode to Dual IR.
To change the detection mode of the ame detector, follow the table below to adjust the DIP
Switch settings. Please note that the factory default setting for the ame detector is set to
Triple-mode.
Switch # 1 Switch # 2 Description
UP UP Triple-mode UV/IR detection, voted any two out
of three sensors (Default Setting)
UP DOWN UV Only
DOWN DOWN Dual IR (IR/IR)
DOWN UP IR Flicker Only
SEE “Changing the Detection Mode” section of this manual for detailed instructions.