Forma Scientific, Inc.
____________________________________________________________________________
4-14
4.16 ZEROING THE CO
2
CONTROLLER (See Figure 4-8)
Important!
This adjustment is made using the CO
2
gas content of ambient air (0.03%),
the most accurate standard available.
Tools Required:
Adjustment screwdriver (provided on the panel)
FYRITE CO
2
Analyzer (use only for checking) or other CO
2
measuring device.
a. Stabilizing the Incubator
1. Stabilize the incubator at the operating temperature and humidity level with no CO
2
in the interior chamber.
2. Turn off the CO
2
at the supply.
3. Fill the humidity reservoir or pan.
4. Allow the incubator temperature and humidity to stabilize. This will take a minimum
of eight hours. On initial start-up, however, allow the unit 24 hours to stabilize.
b. Adjusting the Zero Set Pot (Refer to Figure 4-8)
1. Using the small screwdriver mounted on the control panel, adjust the CO
2
control
zero pot to read 00.0 on the digital display. Wait 5 minutes. Repeat if necessary until
the display is stable.
2. Turn on the CO
2
at the supply.
3. Turn the CO
2
setpoint to the desired %.
c. Checking the CO
2
at the Desired Setpoint
1. Allow the incubator to reach setpoint and control (inject light will cycle) for a
minimum of 30 minutes.
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