Monitoring Combustible Gases - MSA ALTAIR 4 Operating Manual

MSA
2.7

Monitoring Combustible Gases

The instrument can monitor these concentrations in ambient air:
• Methane
• Combustible gases
The instrument displays the gas concentration in % LEL or % CH
Measuring page until another page is selected or the instrument is turned OFF.
If an alarm activates while using the instrument, leave the area
immediately.
Remaining on site under such circumstances can cause serious damage
to health or can even lead to death.
The instrument has two alarm set points:
• HIGH Alarm
• LOW Alarm
If the gas concentration reaches or exceeds the alarm set point, 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.
When gas reading exceeds 100% LEL or 5.00% CH
Lock Alarm state and displays "xxx" in place of the actual reading. This state
can only be reset by turning the instrument OFF and ON.
A combustible gas reading of "100" or "5.00" indicates the atmosphere
is above 100 % LEL or 5.00 % vol CH
hazard exists. Move away from contaminated area immediately.
In such cases, the instrument LockAlarm feature activates.
WARNING
and either the minimum
WARNING
, respectively, and an explosion
4
ALTAIR 4 - Operating Manual
DESCRIPTION
on the
4
(HIGH alarm)
, the instrument enters a
4
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