Labconco Guardian 500 Airflow Monitor - Manual (Page 10)

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2.2 Guardian Alarm Activation :-
The audio and visual alarm will activate approximately 10-30 seconds after an alarm condition is
detected. To temporarily mute the audible alarm, press and release the mute button.
NOTE: After an alarm condition has been detected, the red light will stay on. The audible alarm
will remain muted until the airflow returns to normal levels.