Motor/Blower; Airflow Sensor - Labconco Logic+ 30348 Series User Manual

Type b2 biosafety cabinets

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4: Performance Features and Safety Precautions

Motor/Blower

The motor/blower assembly pulls room air into the front of the cabinet, and re-

circulates it internally. During its recirculation, the air is split into two separate

streams. One path leads through the exhaust HEPA filter and out of the unit. The

second path flows through the supply HEPA filter, which then flows down through

the work area, as shown in Figure 4-4. 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

(CAP) program to

deliver a consistent volume of air, throughout the life of the cabinet.

Figure 4-4

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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