Hanna Instruments Edge HI 2020 - Page 23

Operational Guide
23
pH
Calibration
Rinse and submerse the pH electrode approximately 3 cm (1¼”) into the second
buer solution and stir gently. If necessary, press the ARROW keys to select a
dierent buer value.
The “
” along with “STIR” tag will be displayed and “WAIT” will blink on the LCD
until the reading is stable.
When the reading is stable and close to the selected buer, “CFM” tag will blink.
Press CFM to conrm calibration.
Repeat procedure with additional pH buers. A total of ve pH buers can be
utilized.
After conrming the last desired buer calibration
points, press CAL (or if all ve buer values were
calibrated) the instrument will automatically display
“SAVING” as it stores information. It will then return to
normal measurement mode.
Each time a buer is conrmed, the new calibration
data replaces the old data for the corresponding
buer or for any buer in the proximity of ±0.2 pH.
If current buer has no previous data stored and the
calibration is not full (ve buers), the current buer
is added to the existing calibration. If the existing
calibration is full, the instrument asks which buer to
replace.
Press the ARROW keys to select another buer to be replaced.
Press CFM to conrm the buer that will be replaced.
Press CAL to leave calibration without replacing.
Note: If the replaced buer is outside the ±0.2 pH window of the calibrated
buers, it is possible to select this buer during the next calibration.
Working With Custom Buers
If a custom buer was set in SETUP menu, it can be selected during calibration
by pressing the ARROW keys. The “C1” or “C2” tag will be displayed once selected.
Press u if you want to modify the custom buer
value. The buer value will start blinking.
Use the ARROW keys to change the buer value.
After 5 seconds, the buer value is updated. Press u
if you want to change it again.
w ww . . co m
information@itm.com1.800.561.8187