Hanna Instruments GROLINE HI981421, Instruction Manual, Page: 34 / 48

34
OPERA
TIONAL GUIDE
Two-point calibration
From the MENU screen with pH highlighted, press the
CAL
key to begin the calibration process.
The monitor will suggest using the HI70007 pH 7.01 buffer, but it will automatically recognize
HI70004 pH 4.01 and HI70010 pH 10.01 buffers.
Note: For two-point calibration, the buffer 7.01 pH must be used for the first point.
When the reading is stable and close to the selected buffer, the Confirm key will become available.
Press Confirm to accept and store the calibration point. The monitor will now prompt for the second
buffer .
To continue calibrating with a second buffer, rinse and submerse the pH electrode 4 cm (1½”) into
the second buffer solution and stir gently.
The
Monitor will automatically recognize second buffer 4.01 or 10.01 pH.
If Escape is pressed during the second buffer the display will return in MENU . Only the first calibra‑
tion point will be saved.