Hanna Instruments HI5221 - Page 61

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• Press
then edit the procedure variables to the volumes determined in the prior step.
Procedure:
• Press
to enter Analyte Addition mode.
• Volumetrically add standard to a clean beaker. Add a magnetic stir bar and place on a stir plate.
Stir standard. The method will prompt user to add ISA. Place ISE sensor tip into the solution
and a mV value will show on the display.
• 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 Sample Volume
to the standard solution. The method parameters are also displayed on the LCD.
• 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 an ISE Method Report. Press to return to
ISE Measure mode.
• Press
to start another measurement. Rinse ISE sensor between samples.
• Press
, to modify the method parameters.
Note: Press
at any time to stop the measurement and return to ISE Measure mode.
ANALYTE SUBTRACTION
To measure the concentration of a sample using Analyte Subtraction method:
• Press
and then to select ISE Measure mode for the selected channel.
• Select the Analyte Subtraction method (see ISE Setup
→ Reading Mode).
• Prior to starting an AS procedure, the ISE sensor must be calibrated with a minimum of two
standards containing ISA. The slope of the electrode will be used in all calculations involved in
AS.
• If following an established procedure: Press
then edit the method variables and follow
the procedure below.
• Press
to set the method parameters. Press / to select next/previ-
ous parameter to 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.
ISE MEASUREMENT (HI5222 only)