Shellab SCO12WE-2 - Manual (Page 12)

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To mute the audible alarm on either the Temperature or the CO2 Controls, push one of the up or
down arrows and hold it down until the yellow led light illuminates and the audible alarm silences.
While the incubator is warming, the low alarm will activate within 15 minutes.
To set the CO2 Control Set Point, push one of up or down arrows once on the CO2 Display. The
display should start blinking “SP”. While blinking push the Up/Down arrow to move the Set Point
up or down to the desired set point. Release the button and when the display stops blinking it will
return to the actual CO2 %.
On some older models where you may need to reset the integrator on the CO2 Control, push both
up and down arrows simultaneously until the display start blinking “CO”. Then push the down
arrow until the display reads “CL” and release the button. The control will return to normal
operation after it stops blinking. This procedure should only be done if you are having trouble with
CO2 overshoot.
5.4 Calibrating the Controls:
A. Push and hold both the UP and DOWN buttons simultaneously until the control displays CP (for
temperature) or CO (for CO2) after the display will start to blink.
B. While the display is blinking the UP and DOWN buttons can be used to adjust the display to
match the actual condition in the incubator chamber.
C. If no buttons are pressed within five (5) seconds the blinking will stop and the display will revert
to showing the process or actual parameter within the incubator chamber
5.5 Humidification: Humidification of the unit is achieved by evaporation of water from the chamber
humidity pan placed in the bottom of the incubator. By filling this stainless steel reservoir pan with
water and allowing this water supply to heat and evaporate, near saturation humidity is obtained. Do
not use plastic, glass or other metals. Only 300 series stainless metals are acceptable for this
reservoir pan. Do not use corrosive chemicals, including copper sulphate or chlorine, in the pan or
chamber as damage may occur. DO NOT USE DEIONIZED WATER!
Use of disinfecting chemicals in the chamber can change the surface tension of the reservoir water
thus preventing evaporation and proper humidification of the chamber. Water in the pan should be
changed and the pan cleaned at least once a week to help control contamination and maintain
proper surface tension.
5.6 Temperature Monitoring: To insure that the incubator is operating at the desired temperature, an
accurate temperature indicator such as a certified reference thermometer should be placed in the
incubator chamber. Try to place the thermometer in the center of the chamber and raised off the
shelf (taping the thermometer down to a Petri dish is a method that raises it off the shelf and
prevents it from rolling and hiding the scale from view. For ease of reading the thermometer, it
would be better if it was electronic with a remote display so it can be read without opening the doors.
5.7 Initial Control Settings: Set controls to the set point you want your incubator to operate at.
A. Set the OTP to its maximum position clockwise. After making initial control settings
allow the incubator to warm up and stabilize for 24 hours.
B. All units are shipped set for 37

C and CO
2
OFF. If other conditions are desired follow the
instructions in section 5.3 for resetting the controls.
5.8 Temperature Calibration: It is important that the calibration be performed in the following order:
Main temperature, and then the Over Temperature Safety.
A. During main temperature calibration it is important that the inner glass door not be opened
for any reason, and that the outer heated door is opened as little as possible.
B. After the incubator has been running for 24 hours and the temperature display is stable at
the set point, read the temperature in the chamber from the reference thermometer, and if
necessary, recalibrate the display using the instructions in section 5.4.
C. After the main temperature display has re-stabilized and maintained set point for several
hours, check the actual temperature again. If it does not match the display repeat the
calibration.