Minic Measuring Unit - GE B30 Technical Reference Manual

B30 Patient Monitor
Figure 4

3.2.2 MiniC measuring unit

The miniC measuring unit is a non-dispersive infrared analyzer measuring absorption of the
gas sample at 4.2 to 4.3 µm infrared wavelength, which is selected using an optical narrow
band filter. The IR lamp is a filament surrounded by thermal isolation. There is a hole in the
isolation, passing the radiation to a conical measuring chamber with 3 mm length. From the
sample chamber, the radiation goes into a thermopile detector with an optical filter in front of
it.
The temperature sensor measures the miniC measuring unit's temperature and it is used for
temperature compensation.
The miniC measuring unit includes a miniC flexible board, which connects the thermopile signal
and the temperature sensor signal to the CPU board.
Figure 5
8-8
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Document no 2044677-001
Side flow
Main flow
Filter
Zero
valve
MiniC
Diff.
Pressure
Sensor
Diff.
Pressure
Sensor
Pump
Gas tubing layout
MiniC measuring unit
Mini
D-fend
Room air
Abs.
Pressure
Sensor
Gas out
Sample line