Labconco XPert Weigh Boxes 5220331 - Manual (Page 18)

Chapter 3: Getting Started
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Validating the Glove Box
The XPert Weigh Box has been leak tested at the factory for HEPA filter and
main chamber pressure integrity. The HEPA filters should be leak checked
upon start-up and annually thereafter per the procedure in Chapter 6. Upon
start up, the main chamber pressure should be greater than 0.7" w.g. at
full blower speed to validate proper blower operation; if not, contact
Labconco for service.
NOTE: Main chamber pressure and smoke removal tests
should be performed frequently, per your established
quality system, to ensure safe performance.
Summary of Performance Testing Results
Labconco’s test results show that the XPert Weigh Box meets all the
performance criteria when operated at the following estimated airflow
volumes: 61 CFM or less for weighing with an analytical balance or handling
powders and 61 CFM or above for safe air clean up. The XPert Weigh Box
has been tested to the point of insufficient performance. In each case, the lack
of performance occurred at airflow volumes below Labconco’s minimum
recommended airflow volume for the specific operation. Contact Labconco
or visit
www.labconco.com for complete performance test data. The
following provides a brief summary of the findings:
• Smoke removal was tested at minimum 13-CFM to maximum 100-CFM
airflow volumes. The time required to completely purge the main
chamber of smoke varied from approximately 75 seconds at 100-CFM, to
420 seconds at 13-CFM.
• During tracer gas containment tests with the glove box vented to the
outside, no gas was detected within the operator’s breathing zone.
Perimeter scans were also conducted during tracer gas testing of the
XPert Weigh Box. Under normal laboratory conditions the tracer gas
levels detected during perimeter scan testing were below ASHRAE 110
permissible limits (0.10 PPM average or less) and achieved Labconco
permissible limits (0.05 PPM average or less).
• Sound levels “Noise Pressure” varied from 44 dB(A) at 13-CFM to 71
dB(A) at 100 CFM. If vented to the outside, the sound level will be
greatly reduced.
• Airborne particulate cleanliness (measured under positive and negative
pressures) within the main chamber of the glove box exceeded ISO Class
5 conditions (equivalent to Class 100) and achieved ISO Class 3
conditions (equivalent to Class 1) at both minimum and maximum
operational airflow volumes.
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