BUCHI KjelSampler K-377 - Manual (Page 127)

7 Maintenance
127 K-375/376/377 Operation Manual, Version B
7 .3 .3 Inspecting the buret
Inspect the attached buret(s) to recognize damages as early as possible.
Carrying out a test according to EN ISO8655, Part 3 and 6.
7 .3 .4 Inspecting the titrator
Inspect the electrical contacts (plugs, stirrer) for corrosion and mechanical damage, if the titration unit
is used in premises with an occasional occurrence of corrosive matters in the atmosphere.
Control the hoses, the threaded connections and the seals for visible damage, contamination and
leakage.
If there is suspicion that a solution is attacking the glass excessively, the maintenance interval must
be reduced accordingly.
7 .3 .5 Inspecting the sample tubes
Sample tubes are subject to wear and tear, especially due to the impact of NaOH and also caused
by cleaning in a dish washer. To avoid leaks during distillations it is recommended to check each tube
with the supplied test gauge and to sort out the ones not passing all criteria. Follow the instructions
given on the test gauge and perform all five tests.
① Must touch top of sample tube ④ Line must sink below top of sample tube
② Must not sink below top of sample tube ⑤ Must pass over sample tube
③ Line must not sink below top of sample tube
Fig. 7.1 Test gauge for sample tubes
NOTE
New sample tubes should be checked for the first time after being used for three months. Afterwards
they should be checked on a monthly base.