This part of IEC 61207 applies to the three main methods outlined in the introduction. It considers essential ancillary units and applies to analyzers installed indoors and outdoors. Note - Safety critical applications can require an additional requirement of system and analyzer specifications not covered in this standard. This standard is intended: - to specify terminology and definitions related to the funtional performance of magnetic gas analyzers for the measurement of oxygen in source gas; - to unify methods used in making and verifying statements on the functional performace of such analyzers; - to specify what tests should be performed to determine the functional performance and how such tests should be carried out; - to provide basic documents to support the application of standards of quality assurance (ISO 9001, ISO 9002 and ISO 9003).