Honeywell BW MaxXT II User Manual page 50

TWA Period (hours)
Note: Regulations vary depending upon region. Adhere to the regulations defined for your area.
The TWA Period (hours) option defines a time-weighted moving average of accumulated
gases over a period of 4-16 hours, to ensure the worker leaves an area when the defined
maximum average is accumulated.
Example: The TWA Period option is set to 6 hours. Therefore, the moving average
accumulates over a 6-hour average. If the worker is in the field longer, the oldest
accumulated values (first hour) are replaced by the newest values (seventh hour). This
continues for the duration of the work shift until the detector is deactivated.
Enter a value ranging from 4-16 hours. The detector is shipped with the default setting of 8
hours.
BW MaxXT II 49 User Manual