User Setup; Datalogger Setup - Hach POLYMETRON 9240 Multi-Channel Sodium Manuel D'utilisation De Base

USER SETUP

Measurement
Targeted pH (non-cationic applications only)
Select the pH option and enter the target pH value for your application. The measured pH value of
the sample in the measuring cell should be within ±0.2 pH of the target.
Total gas/water ratio (cationic applications only)
1. For each channel, enter the ratio of gas to water to minimize the DIPA consumption. This is part
of the installation procedure and is explained in more detail in the installation section of the full
user manual.
Measure steps
1. Select the MEASURE STEPS option to set up the measurement timings.
Measure steps - single channel
1. The on line measurement time defines the measurement time of the sample and how often the
measurement values are stored in memory. For a single channel configuration, it is
recommended to leave this time at the default value of 10 minutes.
2. If smart rinsing is required after a calibration, grab sample or sensor reactivation, set this
parameter to Yes and define the maximum rinse time.
Measure steps - multi channel
1. The on line measurement time is the time when the analyzer displays the true sodium
measurement. This value must be at least 1 minute and less than the cycle time.
2. If smart rinsing is required after a calibration, grab sample or sensor reactivation, set this
parameter to Yes and define the maximum rinse time.
3. The cycle time is the total measurement time for each channel and cannot be less than
10 minutes.
4. After a change of measurement channel, for a manual mode with a fixed cycle time, set the
search stability mode to No. For an automatic mode which minimizes the cycle time, set this
parameter to Yes.
Reactivation frequency
1. Select the ACTIVAT. FREQ option to set the time period between electrode reactivation. When
this time period expires, the electrode is reactivated automatically with an injection of a small
amount of reactivation solution.
2. Set the reactivation mode to either a Frequency or a fixed date.
3. If set to frequency, the recommended time period is 24 hours so that the electrode is reactivated
on a daily basis.
Note: If this value is set to zero, then no electrode reactivation will take place during the calibration process and
as such the calibration may be inaccurate. It is highly recommended to set this parameter to 24.
4. If set to a fixed date, define the day and time of the week when reactivation takes place. Set the
day of the week to an asterisk if reactivation is not to take place on that day.

Datalogger setup

1. Select the VIEW DATA option to display the requested data.
2. All information matching the parameters selected in the VIEW SETUP option is displayed on the
screen. If the data covers more than one screen, an Arrow key will be displayed at the bottom.
Use this key to scroll through the data.
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