180
11. When the cabinet blower speed stabilizes, it may be
changed if needed to rebalance the unit. When the
blower speed stabilizes, ‘OK’ TO CONTINUE will
appear, when any adjustment to the blower speed is
complete, press [OK/MUTE].
12. If this is an initial certification, or a recertification after
HEPA filter replacement, select New Filter. If this is an
annual recertification or install of a new Airflow Sensor,
select Same Filter. If you want to set the filter gauge at
a preset value, select Set Filter Life. Press
[OK/MUTE].
If the biosafety cabinet is an A2 12-inch or C1, two
additional screens will appear similar to those in Steps
11 & 12 for the exhaust blower.
13. Change the average inflow to match the value you
obtained when you measured it. Use [UP] or [DOWN] to
change the inflow as needed. When the displayed value
matches the value obtained during certification, press
[OK/MUTE].
14. On type A2 & C1 cabinets only, calibrate the average
downflow to match the value you obtained when you
measured it. Use [UP] or [DOWN] to change the inflow
as needed. When the displayed value matches the
value obtained during certification, press [OK/MUTE].
15. Type B2 units will now ask you to reduce the total
exhaust volume to 90% of the nominal value. When
you have done this, press [OK/MUTE]. Note: This step
is critical - it sets the alarm point for the exhaust flow. If
you press [OK/MUTE] before reducing the flow to 90%,
the BSC will assume the alarm setpoint is equal to the
nominal airflow, and the unit will return an Exhaust
Alarm constantly. When complete, reset the exhaust
damper to its nominal setting.
Calibration mode is finished, if a Type C1, select No when prompted to calibrate VSS.
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