Hanna Instruments HI 4211 - Manual (Page 51)

5 1
• When the reading is stable, press to store the first mV reading. The second step of the method
will be displayed on the LCD in which the user is notified to add the Standard Volume of set concentration
to the sample. The method parameters are also displayed on the LCD.
• Press to change the desired method parameters as indicated in the first step of the method.
• Press to take the second mV reading.
• When the reading is stable, press to store the
second mV reading. The ISE measurement results will be
displayed on the LCD.
• Press to log the current results into a ISE Method
Report or press to return to ISE Measure mode.
• If pressing , the method parameters can be changed
and the sample concentration will be recalculated.
• Press to start another measurement.
Note: Press at any time to stop the measurement and
return to ISE Measure mode.
KNOWN SUBTRACTION
To measure the concentration of a sample using the Known Subtraction incremental method:
• Press
and then to select ISE Measure mode for the selected channel.
• Select the Known Subtraction method (see ISE Setup for details, page 33).
• Press
to start the measurement. The first step of the method will be displayed on the LCD in which the
user is notified to add the appropriate ISA Buffer Volume (if different from 0 mL) to the sample and to immerse
the electrode into the Sample Volume. The method parameters are also displayed on the LCD.
• Press to set the method parameters. Press / to select next/previous parameter
to be edit, then press and use or to set the desired parameter value. Press
to save the modified value and then press to exit method parameters edit menu.
Note: For the Known Subtraction method, the stoichiometric ratio (factor) between standard and sample
must also be set in order to take accurate measurements.
• Make sure that the set parameters values are the used ones and submerge the Ion Selective Electrode tip
approximately 4 cm (1½”) into the sample to be tested.
• Press to take the first mV reading.
• When the reading is stable, press to store the first mV reading. The second step of the method
will be displayed on the LCD in which the user is notified to add the Standard Volume of set concentration
to the sample. The method parameters are also displayed on the LCD.