Monitoring Oxygen Concentration - MSA ALTAIR 4X Manuel D'utilisation

If an alarm activates while using the instrument, leave the
area immediately.
Remaining in the area under such circumstances can cause
serious personal injury or death.
The instrument has four gas alarms for each toxic gas:
• HIGH Alarm
• LOW Alarm
• STEL Alarm
• TWA Alarm.
If the gas concentration reaches or exceeds the alarm setpoint, the
instrument:
• backlight turns ON
• a vibrating alarm triggers
• displays and flashes the Alarm icon
icon (LOW alarm) or the Maximum icon
• enters an alarm state.

2.8 Monitoring Oxygen Concentration

The instrument monitors oxygen concentration in ambient air. The alarm
setpoints can be set to activate on two different conditions:
• Enriched - oxygen concentration > 20.8 % or
• Deficient - oxygen concentration < 19.5 %.
While the instrument can detect up to 30% oxygen in the ambient air, it
is approved for use only up to 21% oxygen-content.
If an alarm activates while using the instrument, leave the
area immediately.
Remaining in the area under such circumstances can cause
serious personal injury or death.
When the alarm setpoint is reached for either of the above conditions:
• an alarm sounds
• alarm LEDs flash
2-12
" WARNING
and either the Minimum
" WARNING
(HIGH alarm)