Black & Decker MULTI-GAS DETECTORS Manuel d'utilisateur Page 37

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GasAlertMax
Alarms
Gas Exposures Computed
a Warning
To avoid possible personal injury, do not
deactivate the detector during a work shift. The
detector automatically resets the TWA, STEL,
and maximum (MAX) gas exposures at start-up.
If you reactivate the detector during a work
shift, these values will not reflect the entire
work shift.
Table 7. Computed Gas Exposures
Gas Exposure Description
TWA
(CO and H
2
S
only)
Time-weighted average based
on accumulated exposure to
toxic gases averaged over a
workday
Accumulated value.
STEL
(CO and H
2
S
only)
Short-term exposure level base
on a 5-15 minute period (user
selectable).
Accumulated value.
Maximum*
(Peak)
Highest gas level encountered
during the period the detector is
turned on.
* For oxygen, it is the highest or lowest concentration
encountered.
27
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