Draeger Medical Systems Infinity Acute Care System (M540) Catalog Numbers: MK31501/MK31701/MK31722
Cockpits with revision index 06 or higher that contain 4GB RAM modules may not annunciate audio or visual alarms on the Cockpit and Central Station.
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https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-2734-2017