37 • Chapter 3: Operation GX-3R Pro Operator’s Manual
Alarm
Concentration of gas rises above the
Alarm setting or falls below the
Alarm setting for O
2
.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
AL2
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
Alarm H
Concentration of gas rises above the
Alarm H setting.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
AL3
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
TWA or STEL
Concentration of CO, H
2
S, CO
2
, or
super toxic gas rises above the TWA
or STEL alarm setting.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
TWA or STEL.
• 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-3R Pros with
H2-compensated CO sensor)
Concentration of hydrogen rises
above 2000 ppm (parts per million).
• H2 and RICH alternate in the
lower right corner
• 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 by flashing OVER and
the units field alternates between
the units and OVER.
• 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 by flashing -OVER and
the units field alternates between
the units and MOVER.
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
Alarm Type Visual Indications Other Indications
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