Honeywell ACM 150 Manual To Installation, Operation, And Maintenance page 71

ACM 150
Lock-on mode and demand scan mode
Lock-on mode
The Lock-on Mode interrupt the normal scanning to lock onto an area and monitor
it continuously for some period of time. It is often used following the detection of
a Alarm 1 or Alarm 2 level leak. It allows you to monitor the area where the leak
occurred, observing the gas concentrations as they change to determine if the level
is increasing or decreasing. It is a recommended procedure when ERT employees
go to the sample point to check for the source of the leak. You can communicate
with the ERT employees and report the readings to them if they start to change. The
Lock-on Mode can help ERT determine when it is safe for workers to re-enter an
area.
The Lock-on Mode is also used to introduce a test chemical while the ACM 150
monitor is locked onto the area. Lock-on Mode data is archived.
Figure 37. Lock-on mode menu
The Lock-on Mode screen,
You can only select an area that has been setup for monitoring, which is indicated by
a green box. Areas with greyed-out boxes are not set up and cannot be selected.
Figure 37, allows you to select the area you want to scan.
71