BUCHI KjelSampler K-377 - Manual (Page 121)

7 Maintenance
121 K-375/376/377 Operation Manual, Version B
7 .1 .2 After sample determination
Clean the system using the Cleaning procedure and/or manual cleaning.
• The software offers the possibility to add
a cleaning step to each sequence for the
sample determination with a sampler K-376/
K-377. If you choose “Add defaults” when
creating a new sequence the cleaning step is
automatically added to the sequence subse-
quent to the rack determination step.
• However, if you do not create a new
sequence based on the default steps, the
cleaning step can be added to the sequence
at any time using the
NEW button.
• Rinse off the electrode with distilled water, do not wipe it off but carefully sponge off excess droplets.
NOTE
Use 150 mL distilled water for cleaning if a 300 mL sample tube is used.
Use 300 mL distilled water if a 500 mL sample tube is used.
Change volume of water in: System Preparation  Cleaning  H
2
O volume.
• Place the pH electrode into the storage cap – the pH electrode must be stored in saturated KCl
solution (4.2 mol/L).
7 .1 .3 pH electrode/pH calibration
Storage
The pH electrode must be stored in saturated KCl solution (4.2 mol/L).
NOTE
A pH electrode should not be stored dry as this would destroy the diaphragm. If a pH electrode has
been stored dry, let it regenerate in saturated KCl for 24 hours or at least over night prior to further
use. Never touch the tip of the electrode and do not wipe it with tissue paper or cloth.
Calibration
Treat the electrode according to the recommendation described in the electrode supplementary
sheet.
Calibrate the electrode every day before starting sample determinations.