Labconco Logic+ A2, Technical Manual

Page: 63 / 201

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5. Open the correct number of Laskin Nozzles on the aerosol generator (refer to
Table 10-2).
6. Scan the downstream side of the supply HEPA filter by passing the sampling
nozzle in slightly overlapping strokes over the entire surface of the filter. The
sampling nozzle must be no more than 1 inch from the surface of the filter media.
Scan at a traverse rate of not more than 2 inches per second.
7. Scan the entire periphery of the supply HEPA filter, including the gasket between
the filter frame and the biosafety cabinet structure.
Note: When scanning the front edge of the supply HEPA filter, photometer operation
may become erratic due to the aspiration of room air into the front of the work area.
This problem can be minimized or eliminated by placing the edge of a sheet of rigid
plastic or metal just outside the edge of the HEPA filter when scanning the front edge.
See Figure 10-13 as reference.
Acceptance Criteria
Aerosol penetration shall not exceed 0.01%.
Reinstall the inlet pre-filter and diffuser, ensuring the two holes in the back of the
diffuser frame engage the posts on the rear wall of the cabinet. See Figure 10-14 for
reference.
Figure 10-13
Figure 10-14
Diffuser Pins
engaged
correctly