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Airflow Sensor Calibration
All Type B2 biosafety cabinets have an airflow sensor to sense the exhaust air pulled
from the cabinet by the remote (building) exhaust system. Type A2 and C1 biosafety
cabinets may have an airflow sensor as an optional accessory.
Unless installing or replacing the airflow sensor, the zero point should be correctly set
from the factory (see Zero Point Calibration later in this section). Once proper airflows
have been set by a trained and qualified certifier, the nominal set point should be
calibrated after setting the Filter Life Gauge in the Calibration menu. For a Type B2
biosafety cabinet, both the nominal and alarm set point will be calibrated.
Type A2 and Type C1
Note: If installing an airflow sensor on an A2 or C1 biosafety cabinet in the field, which
did not previously have this accessory installed, first enable the Airflow Sensor in
Configuration, as described in Change Configuration in Section 8: Configuration.
To access the Airflow Sensor Calibration screen(s), follow the steps in Adjusting the
Blower Speed and Setting the Filter Life Gauge previously shown in this section, until on
the Filter Life Selection screen. Then follow these instructions:
1. On the Filter Life Selection screen, press [OK/MUTE].
2. Using the average inflow velocity measured during airflow certification, use [UP]
or [DOWN] to adjust the Nominal Inflow Value to match this measured velocity.
The Nominal Inflow Value will flash, and it will be displayed in feet per minute
(FPM) or meters per second (M/S) based on the desired units selected in the
Settings submenu. Once set, press [OK/MUTE].
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