Buchi KjelSampler K-377 Uživatelský manuál stáhnout pdf (Strana 122)

7 Maintenance

122 K-375/376/377 Operation Manual, Version B

We recommend replacing the electrode, if it does not fulﬁll the following criteria at 25 °C room

temperature anymore:

• Slope 95 – 105 %

• Zero point pH 6.4 – 7.6

For pH electrodes other than the ones supplied by BUCHI, additional criteria might be important.

NOTE

It is recommended to use buffer solutions pH 4.00 and 7.00.

Discard buffer solutions after usage. Work with fresh solutions every day.

To calibrate the pH electrode

• select System Preparation  Calibration pH

electrode

• adapt all parameters to your needs

• press START and follow the SOP given by

the software.

Details about all available parameters can be

found in chapter “6.6.1 System preparation”.

7.1.4 Filling boric acid into receiving vessel after last sample of rack was determined

By default the pH electrode has to be stored in saturated KCl solution. Keeping the electrode for a

long time in air reduces its lifetime.

If there is no chance to clean the electrode and store it in KCl solution, we recommend to ﬁll boric

acid into the titration vessel after the last sample was determined.

Boric acid can be dosed into the receiver at the end of each sequence:

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 159 160

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Buchi KjelSampler K-377 Uživatelský manuál Strana 122