Nellcor Oximax NPB-40 Operator's Manual page 66

NPB-40 Operation
2. Press the Up Arrow button or the Down Arrow
button until OFF is shown.
3. Press the Alarm Silence button to set the alarm
silence duration to OFF and return to normal
operation.
Note: The Alarm Silenced indicator will flash and an
audible reminder sounds every three minutes while
the alarm silence duration is set to OFF.
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