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Laboratory Fume Hood/Ventilation
Equipment Alarm Indicators
There are different types of Audible/Visual (AV) indicator
systems used on fume hoods at the University of Delaware. Your fume hood
must have one of the indicators listed below. These indicators have an
audio and/or visual indicator which alerts laboratory personnel if there
is insufficient airflow in the fume hood or laboratory ventilation
equipment.
There are four different indicators installed on fume hoods
around campus:
Active Devices
Guardian Air Monitors:
Face velocity indicator with an audible and
visual alarm if the face velocity goes below or exceeds a safe
level.
Safe Air Monitors:
Sash height, voltage and temperature alarm
sensors.
Ever Watch Face Velocity Monitor:
Green indicator light for normal operation.
Red indicator light and audible alarm when the
velocity goes below or exceeds a safe level.
Passive Devices:
Magnehelic:
Qualitative flow indicator only. The gauge should
read greater than 0.1 inches of water.
When an AV system indicates a problem with the fume
hood or ventilation equipment:
Stop all processes and remove all chemicals to an
appropriate storage area. If the chemicals cannot be moved, assure that
they are sealed/capped.
Contact DEHS at X8475.
Do Not simply press the silence button on the
AV indicator and continue working. You may expose yourself and others to
hazardous chemicals.
Questions
or requests for more information may be addressed to Ann Woodall or call
831-7026.
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