Hanna-instruments HI 9124 Manuel d'utilisateur télécharger pdf (Page 9)

ORP MEASUREMENTS (HI 9125 only)

To perform ORP measurements, connect an optional ORP electrode

(see “Accessories” section) to the meter and turn it ON.

If necessary, enter the mV mode by pressing RANGE until the display

changes to mV.

Submerse the ORP electrode 3 cm (1¼”) into the sample to be tested

and wait a few minutes for the reading to stabilize.

Measurements within the ±699.9 mV range are displayed with

0.1 mV resolution, while outside this range the resolution automatically

switches to 1 mV.

For accurate ORP measurements, the surface of the electrode must be

clean and smooth. Pretreatment solutions are available to condition

the electrode and improve its response time (see “Accessories” section).

MEM & MR FUNCTIONS

The instrument allows the user to store the current measurement (pH

and temperature, or mV and temperature) into internal memory by

pressing the MEM key. The “MEMORIZE” tag lights up on display.

Stored values can be recalled by pressing MR: the display will show

the values and the “RECALL MEMORIZED” tag as long as the

button is pressed.

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Hanna-instruments HI 9124 Manuel d'utilisateur Page 9