Labconco Type C1 Biosafety Cabinet Models 30468 - Manual (Page 79)

Product Service 1-800-522-7658 79
2. The Axiom is now ready for the Supply HEPA Filter Leak Test. Set the
photometer sampling valve to “DOWNSTREAM”. Ensure there is a proper vacuum
at the sampling port of the pistol.
3. Open one Laskin nozzle.
4. Ensure the pressure gauge on the generator is reading 22 +/- 1 PSIG.
5. Scan the downstream side of the HEPA filter by passing the sampling nozzle of
the gun in slightly overlapping strokes over the entire surface of both of the
filters, with the sampling port not more than 1 inch from the surface of the filter
media. Scan the entire periphery of the filters and the gaskets between the filter
frame and the Axiom frame. Scanning shall be done at a traverse rate of not
more than 2 inches per second.
Figure 5-5
Note: Operation of the photometer may become erratic
when testing the front edge of the supply filter frame,
due to 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 at
the edge of the filter gasket when scanning this area, as
shown in Figure 5-15.
Acceptance
Aerosol penetration shall not exceed 0.01%.
Reassembly
When reinstalling the supply filter diffuser, ensure that the two holes in the back edge of
the diffuser engage the diffuser support posts on the rear wall of the work area, as
shown in Figure 5-6. Reinstall the prefilter.
Figure 5-6
Diffuser pins engaging the holes in the rear of
the diffuser.