Labconco Precise HEPA-Filtered Glove Boxes 5220231 - Manual (Page 37)

Chapter 6: Maintaining Your Glove Box
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the blower inlet (suction side) test port. Connect this tube to the
“downstream” sampling port of the photometer.
Acceptance
The downstream average penetration shall not exceed 0.005 percent as
measured by the photometer.
Initial Certification
The Precise HEPA-Filtered Glove Box has been leak tested at the factory
with helium gas at positive 1" w.g. pressure; leaks cannot exceed 1 x
10
-3 cc/sec. The HEPA Filter Leak Test has been performed at the factory on
both HEPA filters with no particulate leaks greater than .005 percent. The
filtered glove box should be certified before use for the three tests listed
under Re-Certification below. It is also recommended to perform the HEPA
Filter Leak Test again should there be any damage caused during transport.
Re-Certification
Under normal operating conditions, the glove box should be re-certified at
least annually if serviced. The certifier should perform the following tests.
• Record airflow volume and glove box static pressure. Replace HEPA
filters if pressure doubles or airflow is reduced to half the original
volume.
• Perform HEPA Filter Leak Test.
• Perform a Smoke Test to determine proper dilution rate inside the glove
box. Smoke removal should be completely purged in less than two
minutes at full blower speed.
Fluorescent Light Replacement
1. Disconnect the power. Refer to Appendix A for replacement parts.
2. Locate the light reflector located on the top of the glove box behind
the front panel.
3. Remove the light reflector support by removing two hex nuts located
on both sides of the light reflector.
4. Remove the old fluorescent lamp.
5. Reinstall the new fluorescent lamp and light reflector by reversing the
steps above.