Baker SterilGARD II SG400STD - Replacing the HEP a Fil Ten

6. Tape a sheet of plastic or other material
around the viewscreen and the lower tracks.
7. Attach compressed air to the drain valve and
pressurize the cabinet to 2'' water column.
This pressure can be maintained by flowing
compressed air if there are leaks in the taped
area.
8. Apply liquid leak detector along all welds,
gaskets, penetrations and seals on the
exterior surfaces of all cabinet p len urns. A
leak will be revealed by the appearance of
bubbles. Make sure not to miss large leaks
which may blow the leak detector solution
away without creating bubbles.
9. Repair all leaks until no further bubbles
appear.
10. Remove the compressed air lines, making
sure that the drain valve is closed. Remove
the sealing rna !erial. Then clean up the
C<lhinet and re-assemble the viewscreen by
reversing the disassembly process.
i Grounding Continuity Test
Using a volt-ohmmeter, set it to read the low
resistance scale. Touch the two leads together and
see that the display reads 0.0 to 0.1 ohms. Touch
one lead to the ground lug on the cabinet power
cord while touching the other lead to bare metal
on the unit where the user would be likely to
touch the cabinet. If the display reads 0.0 to 0.1
ohms the unit passes the test.
Maintenance Notes
Cleaning the Work Area
Whatever spills fall through the perforated grills
can be removed through the drain valve after
pToper decontarnination.
To vvash the drain pan under Lhe vvoTk surface,
simply hft up the solid \i
1
/ork surface and the
perforated grille. Remember that this area must
be asstlm.ed to have contamination, so use caution
i.'l. the vvay you approach the task.
21
Ultraviolet (Germicidal) Lamp
As reported in other sections of this manual, UV
germicidal lamps lose their effectiveness over time
and should be replaced when their intensity at the
work surface drops below 40 microwatts p~r
square centimeter.
J£ your cabinet has a germicidal lamp,
frequently measure its intensity at the work
surface with an ultraviolet light meter. The
appearance does not indicate UV effectiveness.
Check the HEPA Filters Regularly
Changes in areas surrounding the laboratory
may produce unexpected dust or other conditions
which affect the filters. To maintain filter integrity
and good cabinet operation, check the air pressure
monitor (or magnehelic gauge) periodically. If the
tmit consistently operates ne<u either end of the
nonnal range, check the fi.lters carefully.
Replacing the HEPA Filters
J£ the control system presents an alarm, or if
your periodic checks of total ai.rflow show a drop
of ten percent or more from the original settings,
the filters rna y be loading with particulates. As
explained earlier in this section, the blower speed
can be manually increased to compensate for filter
loading. However, when the airflow can no
longer be maintained or when the filters are
damaged, they need to be replaced.
Before any panels are removed, the cabinet
must be decontaminated. Please see Page 15 for
specifics
on decontamination. The filters are sure
to h3ve collected microorganisms and other
potentially harmful particles generated in the
work area during their lifetime, and maintenance
personnel shou.ld not allow themselves to be
exposed. It should also be remembered that a
specific gaseous decontamination nl_ay vvork
against InicroorganisnlS
1
but not agall1st chemica}
a_gents. VVhere chernicals are present_, cons11H- ctn
in.dustrjal hygienist or other qualified person.
A chemicallv-contaminated filter must be
handled vJith caution. Personnel should be
protected by clothing or breathing apparatus as
necessary
to the nature of the hazard. It is