Hanna Instruments HI 4521 User Manual
Page 38
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Analyte Addition
This method is similar to the Known Addition method, with the difference that an aliquot of sample is added to a
standard of known concentration. The sample and standard contain the same ion to be measured. The ion
concentration is then calculated using the difference in mV potential.
Analyte Subtraction
In the Analyte Subtraction method an aliquot of sample is added to a standard of known concentration, reacting
with the ion to be measured. The stoichiometric ratio between standard and sample must be known. The ion
concentration is then calculated using the difference in mV potential. The method is especially usefull when there
is no available ISE for the measured ion.
To set the Reading Mode:
• Use
or
to select the
Reading Mode option.
• Press
and use
or
to highlight the
desired option.
• Press
to confirm your selection or press
to
cancel operation.
Temperature – See
pH Setup section.
Note: The Temperature Compensation option is also included in the Temperature parameter.
Temperature Compensation
This option allows the user to enable / disable the temperature compensation for the measurement of Ion
concentration.
To set the Temperature Compensation:
• Use
or
to select the
Temperature option.
• Press
and use
or
to highlight the
Temperature Compensation option.
• Press
and use
or
to enable / disable
the Temperature Compensation.
79
The Resistivity Setup menu allows the user to set the parameters related with the resistivity measurements.
Accessing Resistivity Setup
• Press
while in
Measure mode and then
to
select resistivity range.
• Press
and then
to access
Resistivity Setup
menu.
To access a
Resistivity Setup option:
• Use
or
to select the desired option.
• Press
to confirm your selection.
The following is a description of the Resistivity Setup option
screens.
Profile - see
Conductivity Setup section.
RESISTIVITY
RESISTIVITY
RESISTIVITY
RESISTIVITY
RESISTIVITY SETUP
SETUP
SETUP
SETUP
SETUP
Reading Mode
This option allows the user to select between
Direct and Direct/AutoHold
resistivity reading modes.
To set the
Reading Mode:
• Use
or
to select the
Reading Mode option.
• Press
and use
or
to highlight the
desired option.
• Press
to confirm your selection or press
to
cancel operation.