42 • Measuring Mode, Alarms
Gas Tracer Operator’s Manual, CSA Version
TWA or STEL
Concentration of CO
rises above the TWA or
STEL alarm point
setting.
• TWA or STEL appears
below the gas list.
• Alarm LEDs flash
• Back light turns on
• Buzzer sounds
alternating between a
low and high pitch at
the same rate as
warning indication
• Vibrator pulses at
same rate as warning
indication
Over Range*
• Gas reading replaced
by brackets flashing at
same rate as alarm
indication
• Alarm LEDs flash at
same rate as alarm
indication
• Back light turns on.
• OVER appears below
the gas list.
• Buzzer sounds
alternating between a
low and high pitch at
same rate as alarm
indication
• Vibrator pulses at
same rate as alarm
indication
Low Flow*
• The display indicates
FAIL LOW FLOW
• The Alarm LED’s flash
• Buzzer sounds a
double pulsing tone
(two pulses in quick
succession)
Low Battery
Warning*
• Battery icon blinks
• None
Dead Battery Alarm*
• Gas readings
replaced by
FAIL
• Fan symbol
disappears
• BATTERY displayed
along bottom of
screen
• Alarm LED arrays
flash
Buzzer sounds a double
pulsing tone (two pulses
in quick succession)
Sensor Failure*
•
FAIL
appears at the
bottom of the display
and the failed
sensor(s) are
indicated
• Alarm LED arrays
flash
Buzzer sounds a double
pulsing tone (two pulses
in quick succession)
Table 4: Alarm Types and Indications
Alarm Type
Visual Indications
Other Indications