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Paramagnetic Analyzer for Medical Grade Oxygen

Medical Gas standard USP37 requires a specific, selective and positive identification test using a paramagnetic signal. Regular analysis of medical gas is required to ensure that the oxygen concentration is NLT 99.0% volume. Following the appropriate United States Pharmacopeia standards, in this case specifically USP37, requires an analyzer which uses a paramagnetic based technology.  The paramagnetic PM700 oxygen analyzer from Systech Illinois is ideally suited for this medical gas analysis application.

The technology required for this standard has a paramagnetic sensor which utilizes the paramagnetic susceptibility of oxygen, a physical property which distinguishes oxygen from most other gases. The sensor incorporates two nitrogen-filled glass spheres mounted on a rotating suspension. This assembly is suspended in a strong magnetic field. The oxygen in the surrounding gas is attracted to the magnetic field, resulting in a force on the glass spheres. The strength of the torque acting on the suspension is proportional to the oxygen content of the surrounding gases.

Utilising the well proven magneto-dynamic (dumb bell) transducer, the PM700 offers high performance oxygen analysis. It incorporates user-friendly software to provide accurate and reliable results with a non-depleting sensor providing years of trouble free operation.

Our PM700 Paramagnetic analyzer can be used for the following applications:

Systech Illinois can also offer an analytical solution in relation to the European Pharmacopeia 2.5.28 which states that moisture in gases shall be determined using an electrolytic hygrometer. The Electrolytic P2O5 Moisture Analyzer MM510 from Systech Illinois is perfectly suited for this application.

The technology required for this standard includes a measuring cell which consists of a thin film of diphosphorus pentoxide between two coiled platinum wires acting as electrodes. The water vapor / moisture in the gas to be examined is absorbed by the diphosphorus pentoxide creating phosphoric acid – an electrical conductor.  A continuous voltage applied across the electrodes electrolyzes the water while regenerating the diphosphorus pentoxide. The resulting electric current must be proportional to the water content. The system is self-calibrating since it obeys Faraday’s law.

Posted on Thu Aug 3, 2017

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