OM0133
17
8.3
Control System
The NuAire Incubator Control Electronics system is designed to serve the control requirements of the
incubator chamber. Temperature and CO
2
levels are controlled by preset values to provide the optimum
conditions for culture growth within a chamber. Operator input is coordinated through the control panel
keypad and status displays. Figure 1 shows the various inputs and outputs of the system.
The NuAire Incubator Control Electronics is a state-of-the-art microcomputer based system that provides:
8.3.1
Chamber control in a single electronic package.
8.3.2
Enhanced information presentation
A chamber temperature setpoint and actual
A CO
2
level setpoint and actual
A temperature status LED
A CO
2
status LED
An alarm LED
A mode switch status LED
A heat, CO
2
inject, door ajar, air class, and two CO
2
tank status LEDs.
8.3.3
Simplified operator controls
The control panel is operated using 5 keys, RUN/SETUP, and flag HIDDEN, UP and DOWN
arrows, and the SELECT key. As the SELECT key is repeatedly depressed, the corresponding
LED next to the parameter will indicate the parameter, which is active. Each depression
advances to the next parameter. Entry of setpoint values with mode switch in setup is
accomplished by depressing the UP or DOWN arrow key when the selected parameter is
activated.
8.3.4
Automatic notification of abnormal situations
The red alarm LED on the control panel indicators will light to indicate a fault within the system.
An audible alarm is also heard.
System intermittent
Temperature Control Fault
Temperature is over setpoint by more than 1.0
C.
Temperature does not reach setpoint within 4 hours within 0.2º.
Sensors disagree by 4º
CO
2
Control Fault
CO
2
percent is over setpoint by more than 1%.
CO
2
percent does not reach setpoint within 30 minutes within 0.2%.
Tank Switch
8.3.5 Password
Protection
If desired, the NuAire Incubator Control Electronics may be configured to prevent users who are
unauthorized to change the setpoints CO
2
%, Temp or running conditions of the incubator. The
password protection may be initiated by accessing the option configuration parameters in
diagnostic mode (see Section 8.8). Once the password protection is initiated, the user must use
the correct sequence of the UP, DOWN, and SELECT keys to access the setup mode. To operate,
first press the SETUP key. The displays will then indicate "Pas rEq", password required then
enter the correct sequence of the UP, DOWN, and SELECT keys followed by pressing and
holding the SETUP key for three seconds to access the setup mode.
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