Forma Scientific, Inc.__________________________________________Installation/Start-up
3-14
3.16 Zeroing the CO
2
Controller (See Figure 3-7)
This adjustment is made using the CO
2
gas content of ambient
air (0.03%), the most accurate standard available.
Never use a FYRITE or other analyzer for this adjustment. The adjustment must be
made on initial start-up, and it must also be made if a change in the humidification of the
incubator is required.
Tools Required:
Calibration screwdriver (provided on the panel)
FYRITE CO
2
Analyzer (use only for checking) or other CO
2
measuring device.
Stabilize the Incubator
Stabilize the incubator at the operating temperature and humidity level with no CO
2
in the interior chamber.
Turn off the CO
2
at the supply.
Fill the humidity reservoir or pan.
Allow the incubator temperature and humidity to stabilize. This will take a minimum
of eight hours. On initial start-up, however, allow three days to stabilize.
Adjust the Zero Set Pot (Refer to Figure 3-7)
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.
Turn on the CO
2
at the supply.
Turn the CO
2
setpoint to the desired %.
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