GasAlert Extreme
User Manual
Computed Gas Exposures
To avoid possible personal injury, do not deactivate the detector
during a work shift. The detector automatically resets the TWA,
STEL, and MAX gas exposures during start-up. If the detector is
reactivated during a work shift, the new values will not reflect the
entire work shift.
Table 7. Computed Gas Exposures
Gas Exposure
TWA
Time-weighted average based on an
8-hour workday.
Accumulated value.
STEL
Short-term exposure limit (STEL) to
gas based on a 15-minute period.
Accumulated value.
MAX*
Maximum (MAX) concentration
encountered during a work shift.
*For oxygen, it is the highest or the lowest value from
20.9% encountered.
28
a Warning
Description
Viewing Gas Exposures
Toxic Gases
C
D
1. Press
and
simultaneously. The LCD displays the TWA
gas exposure first.
2. Then the LCD displays the STEL gas exposure.
3. Then the LCD displays the MAX gas exposure.
Oxygen
C
For oxygen detectors, press
maximum low and maximum high levels of oxygen exposure.
D
and
simultaneously to view both the