Monitoring Oxygen Concentration - MSA Altair 5X Mode D'emploi

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 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:
• the alarm message displays and flashes in combination with the
oxygen gas concentration
• backlight turns ON
• alarm sounds (if active)
• alarm LEDs flash (if active)
• vibrating alarm triggers (if active).
The LOW alarm (oxygen deficient) is latching and will not reset even
when the O concentration rises above the LOW setpoint. To reset the
2
alarm, press the ▲ button. If the alarm is latching, the ▲ button
silences the alarm for five seconds. Alarms can be made latching or
unlatching via MSA Link software.
2-16
! WARNING