PARAMAGNETIC SENSING – FOR RELIABLE PERCENTAGE OXYGEN MEASUREMENT |
Magnetic field |
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Servomex ’ s ground-breaking magnetodynamic Paramagnetic technology provides fast , accurate and sensitive measurements of percentage levels of oxygen ( O 2 ), and is ideal for measurements in flammable or corrosive gas mixtures .
The Paramagnetic cell consists of two nitrogen-filled glass spheres , mounted within a magnetic field , on a rotating suspension , with a centrally-placed mirror .
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N 2 filled spheres
N 2 filled spheres
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Taut band Band
Mirror
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Light shines on the mirror and is reflected onto a pair of photocells . O 2 is naturally Paramagnetic , so is attracted to the magnetic field , displacing the glass spheres and causing suspension rotation , which is detected by the photocells .
Current is applied through a feedback coil present in the magnetic field to provide sufficient torque to return the suspension to its original position .
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Paramagnetic magnet |
Rotation |
Light Source
Light source
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The magnitude of this current is directly proportional to the O 2 present in the sample gas mixture . |
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Unlike electrochemical sensing technologies and other types of paramagnetic implementation , a Servomex Paramagnetic cell is non-depleting , so it never needs changing and its performance never deteriorates over time , and no reference gas is required . This reduces ongoing maintenance requirements and delivers a long operational life . |
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P20 |