Honeywell ACM 150 Manual To Installation, Operation, And Maintenance page 76

ACM 150
Since these modes are infrequently used, you can select all three Status Results and
search 24-hour periods. Narrow the time period if the field in
large. View or save only the spectra of interest.
Figure 45. Archived spectra
Time-weighted average
The software features TWA (Time-Weighted Average) and MTD (Month-to-Date)
reporting. Every eight hours an average gas concentration for each point and gas is
calculated and saved to a TWA file on the ACM 150 monitor hard drive. In addition,
an MTD file may be created to calculate an average gas concentration for the last 30
days.
By default, the TWA files are stored in the local folder /home/HA/twa/ and MTD
reporting is deactivated.
ACM 150 checklist and incident plan
ACM 150 monitor is designed for continuous operation 24 hours a day. It performs
all of its functions automatically. Operator interface is only needed when an
incident is detected by the ACM 150 monitor. In all cases, such incidents are noted
on the Status Bar,
Nevertheless, it is important to remember that the system is installed for the purpose
of detecting chemicals which may be dangerous to workers and/or harmful to
the environment. For this reason, it is imperative that the system not be taken for
granted.
Plan for ACM 150 incidents
You can use Form 2 "Plan for ACM 150 incidents" to list and correlate the sample
area numbers to the names for those areas and to the order of scan. The form may
also be used to record and describe any Alarm 1/Alarm 2 or Malfunction Incidents.
The telephone contact list can be part of your action plan to resolve issues.
The ACM 150 monitor's computer continually checks for malfunctions in the analyzer
and the sampling system. Some malfunctions are temporary and self-corrected. For
example, if the ACM 150 monitor acquires a "bad scan". That scan will be rejected
Figure 31 and they activate one or more of the output relays.
Figure 45
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becomes too