Sample Ph Conditioning Check - Hach polymetron 9240 User Manual

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
1. Install a calibrated pH sensor in the center position
2. On the analyzer, press Start on the main menu to
3. For each channel, check that the pH value of the
4.4.9.2 Cationic applications
1. With a calibrated pH sensor, measure the pH of the sample for each channel outside of the
analyzer. Note down these values.
2. The analyzer measurement sequence will be factory set depending on the number of
configured channels (e.g. 1 2 3 4 * for a 4-channel analyzer or 1 2 * for a 2-channel
analyzer). Verify this sequence is correctly setup (see
details).
3. Set the following measurement timings (see
4. For each channel determine the gas injection time ratio depending on the sample pH. Enter
this value into the analyzer as described in
on page
5. Install the same calibrated pH sensor in the center position of the measurement chamber.
6. On the analyzer, press Start on the main menu to start the measurement process.
of the measurement chamber which is normally
used for the ISE sodium electrode.
start the measurement process.
sample after conditioning is greater than 10.5. If not,
check the quality of the conditioning product used.
CYCLE TIME to 11 min
ON LINE MEAS to 8 min
SEARCH STAB to No.
81. The standard values are listed below:
Sequence on page 92
Measure steps on page
Total gas/water ratio (cationic applications only)
pH Tgas/Twater Ratio
2 180%
2.3 80%
2.6 50%
2.9 30%
3.5 15%
4.0 10%
Installation
for more
81):
53