Model 3980 and 3986 Incubators _______________________________Control Panel Operation
3 - 7
3.14 Air Pressure Gauge
The CO
2
is propelled inside the chamber by air pumps. The air pressure gauge
indicates the approximate air pump pressure in a range from 0 to 5 PSIG.
A minimum air pressure or 3/4 PSI is needed to maintain a 5% CO
2
content in the
chamber.
3.15 Recorder (Optional)
The optional recorder provides a tracing of the chamber temperature and, on some
recorder models, both temperature and humidity. Refer to the recorder supplement
included with this manual.
3.17 Air Exchange Ventilator Caps
When using CO
2
in the chamber, the ventilator caps
must be completely closed to minimize CO
2
loss.
Air exchange for the incubator is regulated through the manually adjustable intake and
exhaust ventilator caps located on the top of the cabinet.
When viewed from the front of the incubator, the intake cap is on the left and the exhaust
cap is on the right. The ventilator caps may be opened by turning counterclockwise and
closed by turning clockwise.
