Labconco Type C1 Biosafety Cabinet Models 30468 - Manual (Page 81)

Product Service 1-800-522-7658 81
4. If connected to an exhaust
system, secure the Inlet
Relief Valve in an open
position, to keep the cabinet
blowers operating, and then
remove the screws that
secure the front of the
exhaust connection to its
structure. Place the front
panel aside.
5. The Axiom is now ready for the Exhaust HEPA Filter Leak Test. Set the
photometer sampling valve to “DOWNSTREAM”. Ensure there is a proper
vacuum at the sampling tube.
6. Open the Laskin nozzle(s).
7. Ensure the pressure gauge on the
generator is reading 22 +/- 1
PSIG.
8. Using a rigid 18” long x 3/8” o.d.
tube connected to the
photometer probe pickup, Scan
the downstream side of the filter,
resting the tube in the ridges
located on the top of the opening.
By resting the tubing in
successive ridges, and
alternatively pushing the probe in
on the first ridge, then shifting
the tube to the next ridge, and
then pulling it out, you can
quickly scan the filter surface in
overlapping strokes. By resting
your index finger under the tube
during scanning, you can
accurately control the probe
position and height.
9. Observe the average
concentration of aerosol
downstream.
Acceptance
Average aerosol penetration shall not exceed 0.01%.