§ 868.1640 Helium gas analyzer.
Current through Sep 8, 2026 · Read all of Part 868
(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).