Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 27)

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Analyzer Overview
3.6 Measurement process
3.6.1 Smart rinse option
The measurement cell is rinsed by the analyzer after a calibration, grab sample, or sensor
reactivation process and prior to resuming sample measurements. Set the smart rinsing
parameter to No (see
Measure steps on page 81 ) for a fixed rinse cycle of 10 minutes or set to
Yes to invoke the smart rinsing option which better guarantees the accuracy of measurements
after the rinsing cycle.
If the parameter is set to Yes, a maximum rinse time must be defined. To ensure a fast rinse the
recommended time is 60 minutes with a flow rate of 6 to 9 L/hour. During the rinse process, as
soon as the analyzer determines that measurements are stable it will revert back to sample
measurement mode. If there is an increase in the sodium concentration at any time, then after a
5 minute period the rinsing will be aborted and the analyzer will revert back to sample
measurement mode.
Figure 7 Rinsing process after a calibration, grab sample or sensor reactivation