Motor/Blower; Airflow Sensor - Labconco Cell Logic+ B2 User Manual

Motor/Blower

The motor/blower assembly pulls room air into the top of the cabinet, sends that air
through the supply HEPA filter, and over the internal work area. This air is referred to
as the laminar downflow previously detailed. The downflow air and the inflow are then
removed from the cabinet via the exhaust HEPA filter by the facility's remote blower.
The airflow patterns within the cabinet are shown in Figure 5-4. The motor in the cabinet
is an electronically commutated motor (ECM). The ECM is a brushless DC motor that
includes its own power supply to convert the incoming alternating current to direct
current, as well as its own microprocessor to control and measure the motor's
operation. The motor utilizes Labconco's exclusive Constant Airflow Profile
TM
(CAP)
program to deliver a consistent volume of air, throughout the life of the cabinet.
Figure 5-4

Airflow Sensor

An airflow sensor, located above the Exhaust HEPA filter, constantly monitors the flow
of exhaust air out of the cabinet. If the exhaust falls below a safe level, the control
board turns off the cabinet blower, and sounds an audible and visual alarm. This
prevents the escape of hazardous material from the front of the cabinet, in the event of
an exhaust system failure. The airflow sensor reading is shown on the display as Inflow
in feet per minute (FPM) or meters per second (M/S).
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