Gas Alarms - Honeywell BW MaxXT II User Manual

Gas Alarms

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Gas Alarm Setpoints
The alarm setpoints trigger the gas alarms and are described in this section.
Alarm
Toxics and combustibles: Ambient gas level above low alarm setpoint.
Low alarm
Oxygen: Ambient gas level may be set above or below 20.9% (or 20.8%).
Toxics and combustibles: Ambient gas level above high alarm setpoint.
High alarm
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
To prevent possible personal injury, do not deactivate the detector during a work shift. TWA,
Gas
Exposure
Time-weighted average (TWA) based on accumulated exposure to toxic gases
TWA
averaged over a workday according to OSHA method.
(H S and
2
Default: OSHA 8 hour moving average.
CO only)
User-defined: 4-16 hour moving average.
STEL
Short-term exposure limit (STEL) to gas based on a 5-15 minute user-defined
(H S and
2
period.
CO only)
Maximum*
Maximum (MAX) concentration encountered during work shift.
(peak)
* For oxygen, it is the highest or the lowest concentration encountered.
BW MaxXT II
STEL, and MAX readings reset when the detector is deactivated.
Condition
WARNING
Description
59 User Manual