Mainstream Co 2 Sensor; Co Module; Main Processor Board; Mainstream Daughter Board - Datex-Ohmeda F-LM1 Technical Reference Manual

1.3 CO module
2
The operating principle of the CO
the following functional parts:
•
•
•
Figure 3

1.3.1 Main processor board

The main processor board is based around a 68HC11K1 microprocessor. The processor controls
the parameter measurement circuitry and sensor heater output. The processor also manages the
communication with the CPU board.

1.3.2 Mainstream daughter board

The mainstream daughter board provides the interface to the mainstream sensor. The board
provides the necessary controls to start and maintain sensor motor speed. The board also provides
the necessary logic for detecting sensor fault.
Main Processor Board
Mainstream daughter board
Isolated Power Supply
CO2 MODULE
µCONTROLLER
ABSOLUTE
PRESSURE
TRANSDUCER
CO measurement block diagram
2
module is illustrated in figure 3. The system can be divided into
2
MAINSTREAM
CO2 SENSOR
MAINSTREAM STICK
MOTOR CONTROL
HEATER CONTROL
SOURCE CONTROL
INTERFACE CONNECTOR
Functional description
3
Document No. 8000060-1