Labconco Class I Enclosure Models 3980423 User Manual
Page 45

Chapter 6: Maintaining Your Filtered Enclosure
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41
Calibration
1. Ensure the flow switch and alarm circuit board are installed and
operational.
2. Allow the enclosure to operate for at least two minutes.
3. If factory installed, the monitor will alarm at 60±10 fpm with the inflow
velocity set at 90±10 fpm.
4. To change the factory setting, set the inflow velocity required by your
Safety Officer to the desired alarm condition using the speed control
adjustment procedure outlined in Chapter 6. Once the alarm condition is
set, use a small screwdriver to turn the adjustment screw on the airflow
switch counterclockwise (facing the screw) until the “low” airflow red
LED lights and the audible flow alarm sounds.
5. Adjust the inflow velocity to the nominal operating point required by your
Safety Officer.
6. Over time the HEPA filter will load and eventually slow the inflow
velocity. Once the alarm condition is met, simply increase the speed
control 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 face 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 for proper operating speeds.
Enclosure Operating In-Flow
Speed
Alarm Condition Set Point
Speed
100 ± 10 fpm
70-90 fpm
90 ± 10 fpm
60-80 fpm
80 ± 10 fpm
50-70 fpm
70 ± 10 fpm
50-60 fpm
60 ± 10 fpm
50 fpm
- Class I Enclosure Models 3980421 Class I Enclosure Models 3980403 Class I Enclosure Models 3980401 Class I Enclosure Models 3980323 Class I Enclosure Models 3980321 Class I Enclosure Models 3980303 Class I Enclosure Models 3980301 Class I Enclosure Models 3980223 Class I Enclosure Models 3980221 Class I Enclosure Models 3980203 Class I Enclosure Models 3980201 HEPA Filtered Enclosure Models 3980422 HEPA Filtered Enclosure Models 3980420 HEPA Filtered Enclosure Models 3980402 HEPA Filtered Enclosure Models 3980400 HEPA Filtered Enclosure Models 3980322 HEPA Filtered Enclosure Models 3980320 HEPA Filtered Enclosure Models 3980302 HEPA Filtered Enclosure Models 3980300 HEPA Filtered Enclosure Models 3980222 HEPA Filtered Enclosure Models 3980220 HEPA Filtered Enclosure Models 3980202 HEPA Filtered Enclosure Models 3980200