MSA altair 5, Instruction Manual

Page: 28 / 245

If the gas concentration reaches or exceeds the alarm setpoint or the
STEL or TWA limits, the:
• alarm message displays and flashes in combination with the
corresponding gas concentration:
• backlight turns ON
• alarm sounds (if active)
• alarm LEDs flash (if active)
• vibrating alarm triggers (if active).
2.7 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 25% 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.
"
WARNING
Figure 2-6. Alarm Conditions (High Alarm shown)
2-15