Gas Alarms
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Gas Alarm Setpoints
The alarm setpoints trigger the gas alarms and are described in this section.
Alarm Condition
Low alarm
Toxics and combustibles: Ambient gas level above low alarm setpoint.
Oxygen: Ambient gas level may be set above or below 20.9% (or 20.8%).
High alarm
Toxics and combustibles: Ambient gas level above high alarm setpoint.
Oxygen: Ambient gas level may be set above or below 20.9% (or 20.8%).
TWA alarm Toxic only: Accumulated value above the TWA alarm setpoint.
STEL alarm Toxic only: Accumulated value above the STEL alarm setpoint.
Multi-gas alarm Two or more gas alarm conditions simultaneously.
Computed Gas Exposures
WARNING
To prevent possible personal injury, do not deactivate the detector during a work shift. TWA,
STEL, and MAX readings reset when the detector is deactivated.
Gas
Exposure
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 OSHA method.
Default: OSHA 8 hour moving average.
User-defined: 4-16 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.
Maximum*
(peak)
Maximum (MAX) concentration encountered during work shift.
* For oxygen, it is the highest or the lowest concentration encountered.
BW MaxXT II 59 User Manual
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