5.7 CO
2
Controller Calibration
If it should become necessary to calibrate the CO
2
con-
troller, perform the following procedure.
Start from the standard operating display (setpoint in bot-
tom display, actual CO
2
reading in the upper display).
1. Press the Advance key until “CAL” appears in the lower
display.
2. Use the up and down arrows to make offset adjustment.
3. Press the Infinity key to exit the calibration menu.
Environmental Chamber _____________________________________________________________________________Service
a. Calibrating the Recorder
Place an accurate thermometer(s) in the chamber next to
the recorder’s probe(s). After about three minutes, compare the
thermometer with the chart recorder. For 2 pen operations, also
compare the second thermometer.
Note:
For 2 pen operations, first select the pen
you wish to calibrate. Hold down the #1 arrow
for the red (#1) pen or the #2 arrow for the blue
(#2) pen, until the light goes out. Refer to
Figure 5-9. Then adjust as necessary.
If an adjustment is necessary, press either
the #1 or #2 button to move the pen left or
right. The button must be held about five seconds before the
pen begins to move. Release the button when the pen matches
the thermometer.
5.6 Setting the Door Heater Control
High voltage is present behind control panel.
Servicing must be performed only by qualified
electrical service personnel.
The infinite heater control is located in the left side of the
incubator top compartment behind the
control panel door. The control varies
the amount of door heat from no heat
(zero) to full heat (100) as indicated by
the dial face. If the knob is turned past
zero, a “click” will indicate that all
power to the door is shut off. If turned
past 100, a similar “click” will indicate
that the heat is set at the maximum.
Initially, the units leave the factory
with the dial set at 40. If desired, the amount of heat can later
be reduced until moisture appears on the door, then the heat
advanced. However, in fluctuating ambient conditions, it is rec-
ommended that a minimum of 40% door heat be used.
Figure 5-10
Figure 5-9
Figure 5-11
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