With the introduction of medical gas standard USP37 in the US, requiring a specific, selective and positive identification test using a paramagnetic signal, the focus is on the right analyser to ensure oxygen concentration is NLT 99.0% volume.
Following the appropriate US Pharmacopeia standards, in this case specifically USP37, this requires an analyser which uses a paramagnetic-based technology.
The paramagnetic PM700 oxygen analyser from Systech Illinois is ideally suited for this medical gas analysis application.
The technology required for this standard has a paramagnetic sensor which utilises 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.
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