Shellab SCO26H-2 - Manual (Page 8)

CONTROL OVERVIEW
4.1 Power Switch: The main power I/O (On/Off) switch controls all power to the unit, and must be in the I/On
position before any systems are operational.
4.2 Over Temperature Limit: This control is marked “Set Over Temp” and is adjacent to the power switch. It is
completely independent of the Main Temperature Controller and guards against any failure which would allow
the temperature to drastically rise past set point. If the temperature rises to the Set Over Temp Limit set point,
the Limit takes control of the heating element and allows temporary use of the unit until the problem can be
resolved or service can be arranged. Please note that it is not recommended that the unit be allowed to operate
using only the Over Temp Limit thermostat as temperature uniformity will suffer.
4.3 Over Temp Indicator Light: This pilot light, located on the Main Control Panel just above the word “Over
Temp Activated ”, comes ON when the Over Temperature Limit thermostat is activated. Under normal
operating conditions this pilot light should not be lit.
4.4 Main Temperature Controller: This control is marked “Set Temperature 
C ” and indicates the internal
incubator temperature in 0.1
0
C increments. The UP/DOWN buttons are used to input the set point, calibrating
the display, and muting or unmuting the audible alarm. The HIGH and LOW alarm indicators will light whenever
there is an alarm condition associated with the internal incubator temperature.. The MUTE indicator will light
whenever the audible alarm has been deactivated.
4.5 Heating Indicator Light: Thi s pilot light is marked “Heating Activated” and is on when the heating elements
have been activated to reach and maintain the desired set point.
4.6 CO2 Controller: This controller is labeled “SET CO2 %” and indicates the percentage of CO2 content within
the chamber to 0.1%. The UP/DOWN buttons are used to input the set point, calibrating the display, and muting
or unmuting the audible alarm. The HIGH and LOW alarm indicators will light whenever there is an alarm
condition associated with the CO2% within the chamber. The MUTE indicator will light whenever the audible
alarm has been deactivated.
4.7 CO2 Indicator Light: This pilot light is labeled “CO2 Injecting” and is on whenever the Carbon Dioxide control
has been activated and is actively injecting CO2 gas via the solenoid valve.
4.8 Relative Humidity Controller: This control is marked “Set Humidity Level”, and consists of the analog scale
knob for setting the RH set. The Relative Humidity Controller maintains internal humidity through a proportional
solid state control. The controller utilizes a solid state thin film capacitive humidity sensor to sense the humidity
within the chamber.
4.9 Humidity Injection Indicator: This pilot light is marked “HUMIDITY INJECTING” and is on when water vapor is
being injected into the chamber from the vapor generator.
4.10 Water Low Indicator Light: This pilot light is marked “WATER LOW” and is on when the water level drops in
the vapor generator. The float switch is tripped, the vapor generator is turned off, and water is released from the
supply. When the vapor generator becomes full, the float switch is tripped again, the vapor generator is turned
on, and the pilot light turns off. Intermittent flashing of this light is expected under normal operating conditions.
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