Labconco Protector Work Stations 3930021 - Manual (Page 45)

Chapter 6: Maintaining Your Enclosure
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6. If the red light alarm is on, slowly turn the adjustment screw counterclockwise until
the green light is activated. If the green light is on, slowly turn the adjustment
screw clockwise until the red light comes on. Slowly turn the adjustment screw
back until the red light is activated. It is important that these adjustments be done
in small increments, at intervals about 30 seconds apart to allow for delayed
reaction of the alarm itself. The alarm low flow set point should now be set and the
red light activated.
7. Readjust the enclosure airflow to its normal operating levels. The green light
should now be activated. Calibration is now complete.
Enclosure Operating In Flow Speed Alarm Condition Set Point Speed
100 fpm 80 - 90 fpm
80 fpm 60 - 70 fpm
60 fpm 40 - 50 fpm
8. Note: If the low airflow volume or sash opening cannot be adjusted, then a 1/4 to 1/3
of a turn counterclockwise can be adjusted to set the airflow alarm condition at 10-
25% below normal operating levels.
Guardian 500 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 test/reset button.
NOTE: After an alarm condition has been detected, the red light will stay on. The
audible alarm will remain muted until airflow returns to normal levels.