Shellab SCO31 - Manual (Page 31)

31 | P a g e
OPERATION (CONTINUED)
M
UTING THE
A
UDIBLE
CO
2
A
LARM
Visual high and low deviation indicator alarms will activate if the incubator’s CO
2
level deviates 1%
above or below the CO
2
set point. An audible alarm will sound immediately for a high deviation. The
low deviation audible alarm will sound after the visual low indicator alarm has been continually
illuminated for fifteen (15) minutes. This delay prevents the alarm from sounding whenever a door
opening creates a short-lived drop in gas concentration.
1. To mute an audible alarm, press and hold the Up or the Down arrow button for one (1)
second on the CO
2
Control sub-panel.
2. A muted alarm will stay silent for the duration of the current temperature deviation, and the
amber Muted indicator will remain illuminated.
N O G AS S UPPLY A LARM (NGS)
If the Low Gas deviation indicator is active for longer than twenty (20) minutes, a second
alarm will activate. The letters “ngS” will appear in the CO
2
display to indicate No Gas
Supply. This alarm will remain active even if the incubator is turned off and turned back
on. The NGS Alarm will remain on until CO
2
is restored to the chamber. It may require
several minutes of CO
2
inflow to achieve a concentration high enough to deactivate the
alarm.
Always check the level of the CO
2
gas supply cylinder or wall source if a No Gas Supply alarm is
active.
CO
2
Alarm Activation Time Line