11 | Help with faults
Büchi Labortechnik AG
92/106
Operation Manual K-365 Dist Line
11
Help with faults
11.1
Troubleshooting digestion
Problem
Possible cause
Action
Crystallization after
digestion
False ratio of H
2
SO
4
to catalyst.
u
Use KjelOptimizer software
to optimize the digestion
(download available on
BUCHI website).
Digestion time too long.
u
Decrease digestion time.
u
Compare to conditions to
similar applications.
Suction capacity of scrubber
too strong.
u
Lower the suction capacity
on the scrubber. See
"Scrubber"
operation
manual
Samples do not get
clear
No or not enough catalyst
used.
u
Use KjelOptimizer software
to optimize the digestion
(download available on
BUCHI website).
Digestion temperature is too
low.
u
Decrease digestion time.
u
Compare to conditions to
similar applications.
Temperature is too high.
u
Decrease digestion
temperature.
Sealing material was flushed
into the sample.
u
Check the sealing.
Fume leakage
The seals are defective.
u
Replace the seals.
Suction capacity of scrubber is
too weak.
u
Carry out the scrubber
maintenance. See
"Scrubber"
operation
manual
Leakage in the system, e.g.
hose connector not tight.
u
Check connections between
digester and scrubber.
Blocked hoses.
u
Clean the hoses.
Reduced suction on the bypass
valve.
Boiling retardation/
bumping/foaming
Missing digestion rods or boil-
ing stones.
u
Add boiling rods during
digestion.
Missing antifoam tablet or
other anti-foaming agent.
u
Add antifoam tablet.
