Forma Scientific, Inc.
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4-12
a. Reservoir
The reservoir in the bottom of the incubator may be filled with at least 3/4" of sterile
distilled (50K ohm to 1 Meg ohm) water.
b. Humidity Pan
The optional humidity pan (Forma Stock #237001) will hold 1.6 gallons (6 liters) of
sterile distilled (50K ohm to 1 Meg ohm) water. This pan may be autoclaved. The best
humidity and temperature response from the humidity pan is obtained when the pan is
placed directly on the incubator floor.
The water level in the humidity reservoir should be checked frequently. If a
disinfectant has been added to the water in the reservoir, it should be changed once a
week to help prevent microbial contamination. If a disinfectant has not been added to the
sterile distilled water, the water should be changed at least twice a week.
It is important that the water level in the reservoir or pan be kept relatively constant as
fluctuations or "dry-outs" will have an adverse effect on the humidity level and CO
2
control in the chamber.
Caution: When installing the humidity pan, exercise care to avoid tearing the inner
door gasket.
4.14 SETTING THE CHAMBER TEMPERATURE (Refer to Figure 4-7)
Before the initial temperature setting is made, push the SET/SILENCE button on the
Alarm Monitor Module. Using the adjustment screwdriver , turn the OVER TEMP set
screw until the display shows a temperature that is two to three degrees above the desired
operating setpoint. The over temp safety may be reset after the chamber temperature has
stabilized at setpoint.
If a chamber temperature of 37°C is desired, set the Variable/37°C switch on the
Temperature Control panel to the 37°C (up) position. (Figure 4-2.)
If a value other than 37°C is desired, set the switch to the Variable position (down),
and set the temperature control knob to the desired setpoint. Any temperature between
5°C above ambient to 50°C may be selected.
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