6 Operation
K-375 / K-376 / K-377
Operation Manual, Version E
122
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After sample determination
Clean the system using the Cleaning procedure and/or manual cleaning.
7.1.3.1 Automatic cleaning procedure
∙ 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
subsequent 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.
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.
7.1.3.2 Cleaning of the pH electrode
∙ Rinse off the pH
electrode with distilled water, do not wipe it off but carefully sponge off excess
droplets.
∙ Place the pH electrode into the storage cap – the pH electrode must be stored in saturated KCl
solution (4.2 mol/L).
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pH electrode
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.
We recommend replacing the electrode, if it does not fulfill the following criteria at 25 °C room
