Hach-Lange POLYMETRON 9240 Basic User Manual - Manual (Page 15)

3. The option to increase or decrease the low end value (0 mA or 4 mA depending on your setting)
is displayed. Change the value up or down by selecting the Minus or Plus indicators at the
bottom of the screen.
4. On completion press the Enter function key and the display changes to 20 mA.
5. Enter the adjustment value in the same way as for the low end value. On completion press the
Enter function key, and the display reverts back to the main ADJUST mA OUTPUT screen, to
allow you to select the next output to adjust.
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.
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