Shellab SCO6AD - Manual (Page 32)

32 | P a g e
OPERATION (CONTINUED)
CO
2
Calibration Continued
If the gas CO
2
concentration readings of the incubator and the reference device still fall
outside your laboratory protocol after three calibration attempts, contact Sheldon
Technical Support for assistance.
Note: Three attempts may be required to sucessfully calibrate a unit that is more than 2% out of
calibration.
End of Procedure
M UTING THE A UDIBLE CO
2
A LARM
Visual high or low deviation indicator alarms will activate if the incubator 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.
To mute an alarm, press and hold the CO
2
Up or the Down arrow button for one (1)
second.
The alarm will stay muted for the duration of the current temperature deviation, but the
yellow Muted indicator will remain illuminated.
Another deviation of 1% will reactivate the audible alarm.
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. The 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 take several minutes of CO
2
inflow to establish a concentration
percentage (%) high enough to deactivate the alarm.