§ 868.1640. Helium gas analyzer.
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/us/cfr/t21/s§ 868.1640·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Identification. A helium gas analyzer is a device intended to measure the concentration of helium in a gas mixture during pulmonary function testing. The device may use techniques such as thermal conductivity, gas chromatography, or mass spectrometry.
(b)Classification. Class II (performance standards).