Hanna-instruments HI 4521 Manual do Utilizador descarregar pdf (Página 31)

To set the Stability Criteria:

• Use

or to select the

Stability Criteria

option.

• Press and use or to highlight the

desired option.

• Press to confirm your selection or press

cancel operation.

Reading Mode

This option allows the user to select between

Direct

and

Direct

AutoHold

pH reading mode. If choosing the second option, the current reading can be frozen on the LCD when is

pressed and if the stability criterion is reached.

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.

Log

This option allows the user to edit the logging settings:

Logging Type, Logging Data Configuration, Sampling Period

and

New Lot.

Logging Type

Three logging types are available:

Automatic, Manual

and

AutoHold

. With the Automatic type the values are

logged automatically at constant time intervals while with the Manual type the user has the capability to log a

measured value by pressing . With the AutoHold type the stored values are only the ones frozen on the LCD

• Insert and rinse the probe in the first beaker in order to decontaminate it;

• Insert the probe in the second beaker;

• Tap the probe repeatedly to remove any air bubbles that may be trapped inside the sleeve.

• Enter in calibration mode by pressing

;

• Wait to stabilize;

• When the automatic standard recognition is selected, the calibration point will be automatically selected

from the Hanna standard list (84 µS, 1413 µS, 5.0 mS,12.88 mS, 80.0 mS, 111.8 mS). The user can

also select the desired standard value by using and ;

• Otherwise (user standard), the pop-up will prompt for the custom standard value.

• Press to finish the calibration or to abort calibration.

Note: The calculated cell constant will be used for the whole range.

Multi Point Calibration

• Up to 4 calibration points can be performed in order to

increase the measurement accuracy on the wide range;

• Select the multi point calibration (see

Conductivity Setup

Calibration

);

• Repeat the steps from the single point calibration for each

calibration point. The meter will calculate a cell constant

corresponding to each calibration point;

• Press to exit calibration mode.

Note: For each range the corresponding cell constant will be displayed.

CELL CONSTANT CALIBRATION (edited by the user)

• A known value of the probe cell constant can be set by the user for the whole range (see

Conductivity

Setup

Cell Constant

section)

Note: When the user cell constant is used the old calibration (in solution) will be cleared.

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