Labconco Purifier Filtered PCR Enclosures 3970425 User Manual
Page 35
Chapter 6: Maintaining Your Filtered PCR Enclosure
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5. Adjust the downflow velocity to the nominal operating point required. The
green “safe” LED should light.
6. Over time the HEPA filter will load and eventually slow the downflow
velocity. Once the alarm condition is met, simply increase the speed
control as outlined in Chapter 6 or replace the HEPA filter if the speed
control is maximized.
7. The table below lists typical alarm conditions based on normal operating
conditions. Typical alarm conditions are set at downflow velocities of 10
to 30 feet per minute below the normal operating conditions due to supply
air and exhaust air fluctuations, as well as room air cross drafts. Consult
your Safety Officer or Laboratory Manager for proper operating speeds.
Enclosure Operating
Downflow Speed
Alarm Condition Set Point
Speed
55 ± 10 fpm
25-35 fpm
45 ± 10 fpm
25-35 fpm