Forma Scientific, Inc.__________________________________________________Operation
4-4
Variable/37°C Switch, Temp Control and Heater Pilot Light
When the Variable/37°C switch is set to the 37°C (up) position, chamber temperature
will automatically be maintained at +37°C. If necessary, the 37°C control can be
calibrated using the calibration screw located at the lower left side of the temperature
control dial. See Section 6.3 for calibration instructions for the 37°C setting.
When the Variable/37°C switch is set to the Variable (down) position, control is
assumed by the temperature control potentiometer. The numbers (0 to 60) around the
control knob indicate approximate setpoint values in degrees Centigrade. Any value
between +5°C above ambient temperature and 50°C may be selected. The heater pilot
light will be activated whenever the heater is energized.
Gas Sample Port
A sample port for checking CO
2
percentage by independent means (e.g. FYRITE or
similar CO
2
measuring device).
The Sample Port should never be capped, as it serves as a vent
for the incubator chamber.
Setpoint Adjustment Screwdriver
A small screwdriver, located directly above the sample port, has been provided for
setting the CO
2
and overtemp setpoints. Pull out on the knob to release the screwdriver
(the knob is the handle of the screwdriver).
4.4 CO
2
Module (Refer to Figure 4-3)
CO
2
Power Switch
The CO
2
power switch controls the electrical power to the CO
2
system, and it must be
ON when the incubator is to be operated with CO
2
. The switch should be turned on as
soon as power is applied to the unit to allow the CO
2
system to warm up.
CO
2
Controller and Digital Display
The LCD digital readout on the CO
2
module continually displays the percent of CO
2
in the chamber. The setpoint is displayed when the CO
2
SET/SILENCE button is pushed.
The CO
2
setpoint is changed by pushing the CO
2
SET/SILENCE button and rotating
the CO
2
set screw to the desired percentage.
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