Labconco Paramoun Ductless Enclosures 69636 Series, 6' Widths - Manual (Page 44)

Chapter 6: Maintaining the Ductless Enclosure
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Quarterly (or more often as required)
 Note the airflow velocity on the display. Determine the actual airflow
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).
 The enclosure’s perforated baffle should be checked for any blockage
to ensure that the enclosure is maintaining proper airflow.
 Replace carbon filters when chemical breakthrough is indicated by
organic sensor, odor, time, detector tube, or for some chemicals,
analytical instrumentation. See “Install Carbon Filters” section of this
manual in Chapter 3.
 While the enclosure is filled with a 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 a
minimum of 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.
 All weekly activities.
Annually
 Replace fluorescent lamps, if necessary.
 Replace HEPA filters if the face velocity drops below the
recommended speed for your facility as the airflow alarm alerts you.
 Have the enclosure validated by a qualified certification technician.
See Certification and Recertification in Chapter 6.
 All quarterly activities.
Determination of When to Replace Carbon Filters
The carbon filters MUST be replaced when any one of the following four
conditions are met:
1.
The Safety-First Vapor Sensor indicates chemical breakthrough with an
audible alarm and the display reads “Replace Filters.”
2.
The Filter Life timer has expired as programmed for typical usage.
3.
Chemical odor in the work area is detectable, or the concentration of the
chemical in the work area is greater than the exposure limit/TWA.
4.
Gas detector tubes change color when sampling the ductless enclosure
outlet (exhaust), indicating breakthrough.