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Alarm Delay
When Alarm delay is ON, a gas alarm will be reported when a gas concentration reaches a level 1 or level 2 alarm setting
and stays for more than alarm delay time. If the gas concentration drops below the alarm setting in less than alarm delay
time, the gas alarm event will not be reported. This option is to filter out flickering gas events.
Generate Sub-LDL Events
This is to record Optic signal exceed the Sub-LDL limits while gas concentration remains zero as an informative event.
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 Vertex™ VC4 will run three successive TWA periods from 04:00 to 11:59,
12:00 to 19:59, 20:00 to 03:59. Remember, the Vertex™ 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.
TM
Vertex
VC4 System
50
User Manual
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