Shellab SCO2W-2 - Manual (Page 8)

8
CONTROL PANEL OVERVIEW
(See Figure 2)
All controls are located on the front panel. Units with a detachable cord have a fused inlet located at the top
rear of the control panel. This inlet has a recessed male plug, fuse and an EMI filtering system designed to
filter out electrical interference. This inlet also prevents any internally generated interference from feeding out
to the power grid.
4.1 Power Switch: The I/O (ON/OFF) switch controls all of the power for the incubator and must be in
the I/ON position before any systems are operational. Both temperature and CO
2
displays will
illuminate when the power switch is in the ON position.
4.2 Water Low Light: This pilot lamp is on whenever the internal water jacket float switch has been
tripped to the closed position. When the water drops low enough the float switch closes the circuit
turning on the indicator light.
4.3 Over Temperature Light: This pilot lamp is on whenever the Over Temperature Safety thermostat
has been activated and taken control of the element. During normal operating conditions this
indicator should never be on.
4.4 Main Temperature Control: This controller is marked in C

and indicates the actual temperature
within the chamber to .1

C. The UP/DOWN buttons are used for inputing 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 temperature within the chamber. The
MUTE indicator will light whenever the audible alarm has been deactivated. Some alarm conditions
have a delay programmed in.
4.5 Heating Light: This pilot lamp is on whenever the Temperature Controller is activating the heating
element.
4.6 C02 Control On Water Jacket Incubators: The control sets the rate and the limit of injection
of CO2 into the incubator based on input value and some variables. The input value is set by the
operator. This is set at 5% CO2 in production. The variables are the amount of humidity in the
chamber, and the amount of time the control has been trying to inject CO2.
At start-up, the incubator must be warmed up to operating temperature. This is set in production
at 37°C. During warm up, the water tray for humidity should be filled and placed inside. This
allows the humidity to reach 95% before CO2 is injected.
The CO2 should be turned OFF during warm up. Failure to do so will cause the control overshoot
the set value input by the operator, the injection value can be reset by setting the CO2 levels down
until the display sho
ws “CL”. Resetting the desired value resets the injection rate and limit values
to that which was input by the operator. The unit would be then be reset to the selected
temperature on main and the door and the CO2 set to the desired level.
4.7 Injection Light: This pilot lamp is on whenever the CO
2
controller is injecting CO
2
into the chamber.
4.8 Over Temperature Safety Control (OTP): Located front left of the control panel, this is a hydraulic
thermostat that is wired between the Main Temperature Controller and the heating element and
functions as an override control. If at any time the Main Temperature Control fails in the ON position
and the temperature in the chamber rises above its set point, the OTP is activated and maintains
temperature at its own set point. Note that the HEATING indicator will continue to function under the
control of the OTP.
Section
4