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Paramagnetic Oxygen Analysis
Oxygen is attracted into a strong magnetic field. Most other gases are not.
This paramagnetism is used to obtain fast, accurate oxygen measurements.
A focused magnetic field is created. Any oxygen that is present will be attracted into the strongest part of the magnetic field.
Two nitrogen filled glass spheres are mounted on a rotating suspension within a magnetic field.
A mirror is mounted centrally on the suspension. Light is shone onto the mirror. The reflected light is directed onto a pair of photocells. Oxygen attracted into the magnetic field will displace the nitrogen filled spheres, causing the suspension to rotate. The photocells will detect the movement and generate a signal.
The signal generated by the photocells is passed to a feedback system. The feedback system will pass a current around a wire mounted on the suspension. This causes a motor effect, which will keep the suspension in its original position. The current measured flowing around the wire will be directly proportional to the concentration of oxygen within the gas mixture.