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Principles of Operation Teledyne API T803 CO2/O2 Analyzer Operation Manual
206
Figure 12-1: Paramagnetic O
2
Sensor Design
When sample gas containing oxygen flows into the magneto-mechanical sensor,
the O2 molecules are drawn toward the strong point of the magnetic field. This
causes the N2 filled spheres to deflect even more so that the suspended dumbbell
body pivots on the platinum wire. The more O2 present the further the dumbbell
body is deflected from its neutral position.
The position of the dumbbell is detected by a pair of photocells that receive a
light beam reflected from a mirror attached to the center of the dumbbell body.
As the dumbbell body pivots, the angle of the reflected light beam on the
photocells changes. The resulting potential difference creates a current.
Light
Source
Photocells
C
o
i
l
Figure 12-2: Paramagnetic O
2
Sensor Block Diagram
07276B DCN6418