Hach-Lange POLYMETRON 9245 User Manual - Manual (Page 49)

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Installation
4.4.9 Sample pH conditioning check
Note: At this stage, the electrodes should not have been installed.
4.4.9.1 Non-cationic applications
4.4.9.2 Cationic applications
1. With a calibrated pH sensor, measure the pH of the sample outside of the analyzer.
2. Determine the gas injection time ratio depending on the sample pH. Enter this value into the
analyzer as described in
Total gas/water ratio (cationic applications only) on page 73 . The
standard values are listed below:
3. Install the same pH sensor in the center position of the measurement chamber.
4. On the analyzer, press Start on the main menu to start the measurement process.
5. Measure the pH in the conditioned sample to check if the pump ratios are efficient enough
to obtain a pH of around 11.0. If necessary, update the ratio to maintain a final constant pH
of 11.0 ± 0.2.
1. Install a calibrated pH sensor in the center position
of the measurement chamber which is normally
used for the ISE sodium electrode.
2. On the analyzer, press Start on the main menu to
start the measurement process.
3. Check that the pH value of the sample after
conditioning is greater than 10.5. If not, check the
quality of the conditioning product used.
pH Tgas/Twater Ratio
2 180%
2.3 80%
2.6 50%
2.9 30%
3.5 15%
4.0 10%