Hanna-instruments HI 4211 Manual de usuario descargar pdf (Pagina 44)

mV & Relative mV MEASUREMENTS

mV/ORP MEASUREMENTS

Oxidation-reduction potential (ORP) measurements provide the quantification of the oxidizing or reducing power of the

tested sample.

To correctly perform a redox measurement, the surface of the ORP electrode must be clean and smooth.

DIRECT MEASUREMENT

To measure the mV of a sample using the Direct reading mode:

• Press

and then to enter mV Measure mode

(for the selected channel – HI 4212 only).

• Select the Direct reading mode (see mV Setup for details, page 32).

• Submerge the tip of the ORP electrode (4 cm/1½”) into the

sample to be tested and allow a few seconds for the reading

to stabilize.

• The instrument will display the measured mV value on the LCD.

Note: If the reading is out of range, “-----” will be displayed

on the LCD.

DIRECT/AUTOHOLD MEASUREMENT

To measure mV of a sample using the Direct/AutoHold reading mode:

• Press

and then to select mV Measure mode

(for the selected channel – HI 4212 only).

• Select the Direct/AutoHold reading mode (see mV Setup for

details, page 32).

• Submerge the tip of the ORP electrode approximately 4

cm (1½”) into the sample to be tested and allow a few

seconds for the reading to stabilize.

• The measured mV value will be displayed on the LCD. If

pressing

, the “AutoHold” indicator will start blinking

on the LCD until the stability criterion is reached. The mV value

will be frozen on the LCD, along with “AutoHold” indicator.

• To return to normal Measure mode press

Note: If the reading is out of range, “-----” will be displayed

on the LCD.

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Hanna-instruments HI 4211 Manual de usuario Pagina 44