9 sample ph conditioning check, Installation 4.4.9 sample ph conditioning check – Hach-Lange POLYMETRON 9240 Operator Manual User Manual
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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 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
for more
details).
3.
Set the following measurement timings (see
):
CYCLE TIME
to 11 min
ON LINE MEAS
to 8 min
SEARCH STAB
to No.
4.
For each channel 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)
. The standard values are listed below:
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.
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.
For each channel, 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%