Pellicon
®
3 Cassettes Installation and User Guide
14
Troubleshooting
Symptom
Possible Cause
Remedy
Integrity test
failure or low
retention
Areas of membrane
incompletely wetted
Repeat Flushing
Procedure. Flush with
water, retest
Manifold adapter plate
not
installed
Install manifold
adapter plate
Inadequate pump
capacity
Use larger pump when
wetting filters
Compression of filter
stack inadequate
Inspect threads,
nuts and tie rods and
system compression.
Torque unit again;
retest. Increase torque
if necessary.
Temperature change
since last time holder
was torqued
Torque unit again;
retest
Chemical compatibility
problem
Review chemical
compatibility of filter.
Replace filter.
Damage to membrane
or cassette
Visually inspect filter,
replace as needed
Improper membrane
selection
Contact Technical
Service.
Low NWP
Value
System not vented
properly
Ensure system is
vented so that air is
removed.
System and cassette
not completely flushed
Flush system and
cassette.
System and cassette
not completely cleaned
Clean system and
cassette.
Symptom
Possible Cause
Remedy
High NWP
Damage to membrane
or cassette
Integrity test cassette
System and cassette
over pressurized
Reduce system
pressure
Worn cassette
Replace cassette
Multiple
leaks in filter
stack
Improper torque or
compressive force
Check torque
procedure, retorque.
Check for dirt or
corrosion on tie rods
or bolts
Tube fitting
leaks
Tube/fitting cracked
Inspect, replace part
NPT fitting not
wrapped
Remove old tape, re-
tape adequately with
PTFE tape
End of tubing not cut
squarely
Cut tube square and
reinstall
Missing O-ring or
ferrule on fittings of
defective sanitary
gasket
Replace missing
component, gasket, or
entire fitting
Loose clamp
Tighten clamp
Oversized clamp
Replace clamp with
smaller diameter
clamp
Leak
between
holder, filters
Dirt or debris in filter
Disassemble stack,
remove stack and
check for debris
Compression force too
low
Check torque and
compressive force
Immediate
complete
pressure loss
Tube or fitting leaks
See remedy under
Tube/Fitting Leaks
above
