Honeywell VC4 User Manual page 43

1st TWA Time
Use to set times for the beginning and end of each 8-hour, Time Weighted Average (TWA)
period. Use this option to associate the TWA periods with shifts or any other regular event. The
system calculates and displays the TWA after each 8-hour TWA cycle.
The default setting is 04:00 indicating that the VC4™ system will run three successive TWA
periods from 04:00 to 11:59, 12:00 to 19:59, 20:00 to 03:59. Remember, the VC4™ system uses
a 24-hour clock. For example, to set the first TWA to 3:00 P.M., enter 15:00. The system
automatically sets the beginning times of the second and third TWA periods at 8-hour intervals
from the time entered for the first TWA period.
Report Maintenance Fault
Select OFF to disable maintenance faults. When this option is OFF, the Analyzers will not
generate maintenance faults. Instead informative events will be recorded.
Stale CC Fault
When this option is ON and Chemcassette™ is nearing its expiration date, the maintenance
fault will be generated.
Accelerated CC Usage Fault
When this option is ON and Chemcassette™ usage for up to 24 hours exceeds twice of the
average daily usage, the maintenance fault will be generated.
Generate low CC Fault
VC4™ software tracks the amount of Chemcassette™ tape remaining on the supply reel and
triggers a low tape event when remaining tape is less than Days Before Due. Choosing OFF
disables the low tape event.
VC4™ 43 User Manual