OM0123 Page 28 of 68
Rev 15
8.6 Run Mode Operator Interactions
In general, there is no need for operator interaction in "RUN" mode. However, operator interaction is
required to perform calibration functions and abnormal condition status. If an abnormal condition has, or
does, exist for a particular parameter, a blinking green LED next to the parameter will be lit. This could be a
catastrophic alarm condition, which could harm the tissue culture cells. It does indicate an operational
abnormality and should be checked. To acknowledge the abnormality, simply press and hold the run/setup
key for three seconds to setup and then press and hold the run/setup key for three seconds back to Run. The
blinking green LED will then extinguish. If the abnormality still exists, the blinking green LED will again be lit.
Let run normally, if the blinking green LED doesn't come back on, everything is normal. If the blinking green
LED does come back on, use the troubleshooting guide to correct the abnormality (see Section 11.0).
8.7 Setup Mode Operator Interactions
8.7.1 Chamber Temperature, CO
2
%, Humidity Percent, O
2
% Setpoint
Setpoint values are entered by pressing the "SEL" key until the LED is lit next to the desired parameter
indicator. The value of the selected parameter will be shown in the display in the form "XX.X".
To enter a setpoint, perform the following:
Chamber Temperature Default Set-Point
• Press and hold run/setup key for three seconds to Setup. 37.0°
• Press [SEL] to indicate green LED next to chamber temperature display.
• Press or to indicate desired temperature.
• Press run/setup key back to Run.
CO
2
Percent
1
• Press and hold run/setup key for three seconds to Setup. 5.0%
• Press [SEL] to indicate green LED next to CO
2
percent display.
• Press or to indicate desired CO
2
percent.
• Press run/setup key back to Run.
Humidity Percent (NU-4850, NU-4950) 90%
• Press and hold run/setup key for three seconds to Setup.
• Press [SEL] to indicate green LED next to humidity percent display.
• Press or to indicate desired humidity percent.
• Press run/setup key back to Run.
O
2
Percent (NU-4950)
2, 3
21%
• Press and hold run/setup key for three seconds to Setup.
• Press [SEL] to indicate green LED next to O
2
percent display.
• Press or to indicate desired O
2
percent.
• Press run/setup key back to Run.
1
Please note, when the CO
2
setpoint is set for 0.0%, the CO
2
control system is turned off and all alarms are
inhibited.
2
Please note, when the O
2
setpoint is set for 21%, the O
2
control system is turned off and all alarms are
inhibited. Additionally, since O
2
% directly affects RH%, the RH setpoint will be automatically adjusted when
the O
2
% is decreased. The following table describes the relationship.
16% = <O2 SP = <21%, then max RH% = 95%
11% = <O2 SP <16%, then max RH% = 94%
06% = <O2 SP <11%, then max RH% = 92%
O2 SP <6%, then max RH% = 90%
3
When selecting a setpoint of 10% or below set the air inject time to 0 (zero). See item 17 in section 8.8.4.
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