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ANSI/ISA 92.04.01 Part I-2007 (R2013)
Requirements for Instruments Used To Detect Oxygen-Deficient/Oxygen-Enriched Atmospheres
This standard addresses the details of construction, performance, and testing of portable, mobile, and stationary electrical instruments used to provide a warning of the presence of oxygen-deficient or oxygen-enriched atmospheres.
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The International Society of Automation [isa]