Theory of Operation
Chapter 3: Theory of Operation
Page 3 - 32 Isolette® Infant Incubator (Model C2000) Service Manual
Skin Mode
In Skin Mode, the infant’s temperature is selected from 93 °F to 99 °F
(34 °C to 37 °C) (99 °F to 100 °F (37 °C to 38 °C) in Temperature
Override Mode) by the Skin Set Temperature Up and Down arrow
keys on the front panel. A temperature sensing probe attaches directly
to the infant’s skin. The probe supplies information to the heater control
circuitry, which proportions the heater output to maintain the skin set
temperature.
The air temperature still appears in Skin Mode, but as information only.
If Air Mode is selected while the skin probe remains connected, the
Skin Temperature display continues to display actual skin
temperature, but it does not control.
The sensor module accepts two skin probes. However, when the
second skin probe connects to the sensor module in Skin Mode, an
alarm sounds, and the message Remove Skin 2 Probe appears. To
connect the second skin probe, first select Air Mode. The controller then
displays the two temperatures.
If Skin Probe 1 disconnects from its receptacle during Skin Mode, the
Skin Temperature display goes blank, an alarm sounds, and the
heater turns off.
Oxygen Control
An oxygen sensor assembly mounted inside the sensor module adjusts
the flow of oxygen into the hood and controls the oxygen concentration
level within the incubator’s hood environment.
A valve regulates the flow into the incubator and periodically interrupts
the flow of oxygen into the incubator.
The sensor module houses two independent oxygen fuel cells that
monitor and control the oxygen concentration levels inside the
incubator.
If the sensor module is outside of the hood environment during Oxygen
Mode, audible and visual alarms are enabled, and the flow of oxygen is
interrupted.
In Oxygen Mode, the user sets the oxygen level control point from 21%
to 65%. The high and low alarm limits automatically set to ±3% from the
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