78
Pressing the selected area changes the display by generating a trend graph. Figure 49
Shows a graph of four gases over one day. In this case, a constantly changing H2S and
CO concentration is shown in green.
To rescale the y-axis for a more excellent resolution, move the scale x and y scale bars.
Figure 49. Trend Graph Display
6.8.
Time-weighted average
The software features TWA (Time-Weighted Average) and MTD (Month-to-Date) reporting.
The average gas concentration for each point and gas is calculated and saved to a TWA
file on the ACM 150 monitor hard drive every eight hours. In addition, an MTD file may be
created to calculate the average gas concentration for the last 30 days.
You can download TWA and MTD data from the "Archives>Download" menu.
6.9.
ACM 150 checklist and incident plan
ACM 150 monitor is designed for continuous operation 24 hours a day. It performs all its
functions automatically. The operator interface is only needed when the ACM 150 monitor
detects an incident. In all cases, such incidents are noted on the Status Bar, Figure 32
And they activate one or more of the output relays.
Nevertheless, it is essential to remember that the system is installed to detect chemicals
that may be dangerous to workers and harmful to
the environment. For this reason, it is imperative that the system not be taken for granted.
To Next Page
Loading...
