Air Jacketed CO2 Incubator
2-1
VWR International
Section 2
Calibration
After the unit has stabilized, several different systems can be calibrated. In
Calibration mode, the air temperature, CO
2
and RH levels can be
calibrated to reference instruments. To access Calibration mode, press the
MODE key until the CAL indicator lights. Press the right and/or left
arrow until the appropriate parameter appears in the message display. See
Chart 2-1 at the end of this section for more detail.
Calibration frequency is dependent on use, ambient conditions and
accuracy required. A good laboratory practice would require at least an
annual calibration check. On new installations, all parameters should be
checked after the stabilization period.
Prior to calibration, the user should be aware of the following system
functions. While the unit is in Calibration mode, all system control
functions are stopped so the unit remains stable. Readout of the system
being calibrated appears on the message display. If no keys are pressed for
approximately five minutes while in Calibration mode, the system resets to
RUN mode so control functions are reactivated.
Caution
Before making any calibration or adjustments to the unit, it is
imperative that all reference instruments be properly calibrated.
s
Before calibration, allow the cabinet temperature to stabilize. Place the
calibrated instrument in the center of the chamber. The instrument
should be in the airflow, not against the shelf.
Temperature Stabilization Periods
Startup - Allow 12 hours for the temperature in the cabinet to stabilize
before proceeding.
Already Operating - Allow at least 2 hours after the display reaches
setpoint for temperature to stabilize before proceeding.
Temperature
