How does the Oxygen Analyser work?

02 Sep '18, 08:00

Sept. 2, 2018, 8 a.m.
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This analyzer makes use of two principles:

  1. Oxygen is strongly paramagnetic - it is attracted by a magnetic field
  2. Nitrogen is diamagnetic - it is repelled by a magnetic field.

Two small spheres are arranged, dumbbell fashion about a pivot and between two pairs of pole pieces. The spheres are each filled with nitrogen which is repelled by the magnets, applies a torque to the dumbbell. The gas to be analyzed is passed between the pole pieces, the magnetic field concentrates the oxygen from the gas and a small force, proportional to the oxygen concentration exerts a further torque on the dumbbell arrangement. A mirror attached to the dumbbell reflects light from a lamp onto a photocell where it is converted into an electric input for an amplifier. The amplifier output is arranged to pass through a small coil which is positioned around the dumbbell and generates a torque which is in opposition to that applied due to the paramagnetic effect. A measure of the current flow required to provide the balancing torque is proportional to the oxygen concentration.

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02 Sep '18, 08:02

Sept. 2, 2018, 8:02 a.m.
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