Labconco Protector Work Stations 3930021 - Manual (Page 39)

Chapter 6: Maintaining Your Enclosure
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Monthly (or more often as required)

Determine the actual face velocity through the sash opening of the
enclosure where the average reading should be at the specified velocity.
(Use calibrated thermal anemometer or other approved apparatus). Airflow
alarms are recommended for constant monitoring.

The enclosure rear baffle should be checked for any blockage to ensure that
the enclosure is maintaining proper airflow.

All weekly activities.

While the enclosure is filled with the contaminant, test filter condition on
carbon filters using the appropriate gas detector tube at intervals of 20% of
the total estimated time. The exception to the 20% recommendation is
formaldehyde or any carcinogen or suspected carcinogen. These hazardous
chemicals must be checked at least every 10% of the total estimated time.
Gas detector tubes for the specific chemicals that are being used in the
enclosure can be obtained from your laboratory supply dealer.

Replace carbon filters when chemical breakthrough is indicated by odor,
time, detector tube, or for some chemicals, analytical instrumentation. See
“Replacing Carbon Filters” section of this manual in Chapter 6.
Annually

Replace the fluorescent lamps.

Have the enclosure speed and carbon filters (if equipped) validated by a
qualified certification technician.

All monthly activities.
Setting the Inflow Face Velocity with the
Speed Control Adjustment
1. The speed control is located behind the switched control panel. See Figure
6-1.
2. Adjust the speed control with a small Phillips screwdriver by turning the
screw counterclockwise to increase blower speed or clockwise to decrease
the blower speed. The speed control is very sensitive, so proceed with
caution.
3. Measure the inflow velocity per the averaging technique outlined in
Chapter 3 and adjust the speed control slowly for the desired speed. Allow
the speed to stabilize and re-measure the inflow velocity to confirm.
CARBON