Theory of Operation
Chapter 3: Theory of Operation
Isolette® Infant Incubator (Model C2000) Service Manual Page 3 - 17
3
Theory of Operation
Electrical System
Sensor Module
The sensor module P.C. board provides the interface for the patient and
incubator requirements that the infant incubator must support. The
sensor module assembly reads and processes the following
parameters:
•Temperature
• Oxygen
•Humidity
• Weight information, collected from external sensors and cables
This information is periodically updated and transmitted to the main
controller upon request.
The sensor module P.C. board does not require manual calibration.
Calibration performs automatically and periodically during normal
operation. To provide safe monitoring and control, both the temperature
information and oxygen information have redundant circuitry to prevent
single-fault failures.
All signals are transmitted through serial data communication.
The sensor module connects to a sensor P.C. board that has the
following parameters required for the system:
• Air temperature
• Oxygen
•Humidity
• Fan operation
Power Supply
The power to the sensor module P.C. board is provided through
connector J4, providing ±12V AC for the system. U21, U19, and U15
regulate the voltages by providing +5V, digital +5V and analog -5V,
respectively. U20 provides a precision +5V source for analog signal
conversions.
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