28 • Chapter 3: Operation GX-3R Operator’s Manual
TWA or STEL
Concentration of CO or H
2
S rises
above the TWA or STEL alarm set-
ting.
• Affected channel’s gas reading, gas
name, and units flash
• TWA or STEL appears at the bottom
of the LCD
• Alarm LEDs flash in circle sequence
once per second
• Backlight turns on
• High-low tone sounding
once per second
• Vibrator pulses once per
second
H2 RICH (for GX-3Rs with H
2
-
compensated CO sensor)
Concentration of hydrogen rises
above 2000 ppm (parts per mil-
lion).
• H2 and rich alternate in the lower
right corner
• OVER appears at the bottom of the
LCD
• Alarm LEDs flash twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice per
second
Over Range • Affected channel’s gas reading is
replaced with a flashing
• Gas name and units flash
• OVER appears at the bottom of the
LCD
• Alarm LEDs flash in circle sequence
twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice per
second
Minus Over Range • Affected channel’s gas reading is
replaced with a flashing
• Gas name and units flash
• M OVER appears at the bottom of
the LCD
• Alarm LEDs flash in circle sequence
twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice per
second
Low Battery Warning • The last bar in the battery icon starts
flashing
None
Dead Battery Alarm • Gas readings disappear. FAIL
appears in the middle of the screen
and BATTERY appears at the
bottom of the screen.
• Alarm LEDs flash once per second
Double pulsing tone once per
second
Sensor Failure • SENSOR appears at the bottom of
the screen and the failed sensor(s) are
indicated with FAIL under the gas
name.
• Alarm LEDs flash once per second
Double pulsing tone once per
second
Table 5: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
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