BW Technologies GasAlertMicroClip XT - Computed Gas Exposures; Viewing Gas Exposures

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GasAlertMicroClip
Alarms
Computed Gas Exposures
a Warning
To avoid possible personal injury, do not deactivate the
detector during a work shift. TWA, STEL, and MAX readings
reset once the detector is deactivated.
Table 8. Computed Gas Exposures
Viewing Gas Exposures
To view the TWA, STEL, and peak (maximum) readings, press C twice.
The LCD first displays the TWA gas exposures.
Then the LCD displays the STEL gas exposures.
Finally the LCD displays the peak (maximum) readings.
Gas Exposures Description
TWA
(H
2
S and CO
only)
Time-weighted average (TWA) based on
accumulated exposure to toxic gases
averaged over a workday according to US
OSHA method.
OSHA: 8 hour moving average
STEL
(H
2
S and CO
only)
Short-term exposure limit (STEL) to gas
based on a 5-15 minute user-defined
period.
Peak*
(maximum)
Peak concentration encountered during
work shift.
* For oxygen, it is the highest or the lowest concentration
encountered.