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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.
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A focused magnetic field is created. Any
oxygen that is present will be attracted into
the strongest part of the magnetic field.
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Two nitrogen filled glass spheres are mounted
on a rotating suspension within a magnetic
field.
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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.
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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.
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Benefits:
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Fast
response, totally linear
physical measurement using a high control loop gain
with low cell volume for fast linear response. |
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High
stability and accuracy
extremely tight quality control combined with quality
manufacturing to achieve reproducible results. |
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Long
operational life
from patented technology, material selection and rugged
construction. |
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Low
maintenance requirements
non-depleting physical measurement, no chemicals to
replace or renew. High tolerance of hostile gas components. |
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Insignificant
effect from background gases
inherent in a torque balance technology exploiting
oxygen's paramagnetic properties. |
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