Hanna-instruments HI 4521 Manual de usuario descargar pdf (Pagina 37)

The ISE Setup menu allows the user to set the parameters regarding ISE measurement and calibration.

These parameters can be set specifically for each channel. The settings will be applied only to the focused

channel.

Accessing ISE Setup

• Press

while in

Measure

mode and then to

select ISE range for the desired channel.

• Press and then

to access

ISE Setup

menu.

To access an

ISE Setup

option:

• Use or to highlight the desired option.

• Press to access the selected option.

The following is a detailed description of the ISE Setup option

screens.

Reading Mode

This option allows the user to select the desired reading mode:

Direct, Direct / AutoHold, Known Addition, Known

Subtraction, Analyte Addition

and

Analyte Subtraction

. Except Direct and Direct / AutoHold, all the other methods

are incremental (see ISE Theory section for details).

Direct

If using Direct reading mode, the ion concentration can be read directly from the instrument. Make sure the

instrument was calibrated before taking measurements.

Direct / AutoHold

If using Direct/AutoHold reading mode, the ion concentration can be frozen on the LCD after starting the AutoHold

mode.

Known Addition

In the Known Addition method a standard with a known concentration of the measured ion is added to the sample. The

difference in mV potential is then used to calculate the concentration of the ion in the sample.

Known Subtraction

In the Known Subtraction method a standard with a known concentration is added to the sample, 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.

ISEISE

ISE

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SETUP (HI 4522

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Units

The user can choose between Ohm, KOhm, MOhm, AutoRanging

measuring modes.

To select the units:

• Use

or to highlight the

Units

option.

• Press to confirm and then use or

to highlight the desired unit.

• Press to confirm or press to cancel operation.

Sample ID - see

Conductivity Setup

section.

Log - see

Conductivity Setup

section.

Alarm - see

Conductivity Setup

section.

Temperature - see

Conductivity Setup

section.

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Hanna-instruments HI 4521 Manual de usuario Pagina 37

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