Labconco Biological Safety Cabinets 30468 Series - Manual (Page 64)

Appendix 7: Troubleshooting
Product Service 1-800-522-7658 58
Original instructions
PROBLEM CAUSE CORRECTIVE ACTION
Airflow Alert goes
off and/or there is a
slight decrease in
filter life gauge HEPA filter loading The gauge reading steadily decreases as
the cabinet is used.
Blockage of the
return air slots or
grille Check all return air slots and grilles to
ensure that they are not blocked or
restricted.
Blockage of the
exhaust outlet Ensure that the exhaust outlet is not
blocked or restricted.
Blockage or
restriction under the
work surface Ensure that the towel catch and plenum
beneath the work surface are
unobstructed.
Contamination of
work in the cabinet Improper technique
or procedure for the
biosafety cabinet
See “Use of the cabinet” section in the
manual.
Restriction of the
return air slots or
grille – blockage of
the exhaust outlet Ensure that all return air slots, grilles
and the exhaust outlet are unobstructed.
External factors are
disrupting the cabinet
airflow patterns or
acting as a source of
contamination
See “Working in the Biosafety
Cabinet” section of this manual.
Cabinet is out of
adjustment/HEPA
filter(s) are defective Have cabinet recertified.
Exhaust Alarm goes
off
Roof blower is off
Ensure that roof blower is working.
Remote blower is
improperly sized Confirm that the roof mounted blower
meets the volume and pressure
requirements of the cabinet.
Mechanical failure of
the exhaust system Inspect the exhaust system.
Leak or additional
‘load’ on the exhaust
system Inspect the exhaust system