Labconco Logic Vue User Manual page 59

11. At this point, aerosol is being dispensed from the generator. Do not let the
generator operate in this configuration for an extended period.
12. Set the photometer sampling valve to "DOWNSTREAM". Verify proper vacuum
at the sampling nozzle of the photometer.
13. Scan the downstream side of the exhaust 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.
14. Scan the entire periphery of the exhaust HEPA filter.
Note: When scanning the edges of the exhaust HEPA filter, photometer operation may
become erratic due to the aspiration of room air into the HEPA-filtered exhaust airflow.
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 perimeter
edges. See Figure 4-28 as reference.
Acceptance Criteria
Aerosol penetration shall not exceed 0.01%.
Reinstall the Exhaust Screen, center Work Surface, and Drip Tray. Close the Front
Hatch.
Figure 4-28
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