Hanna Instruments HI 250 - Manual (Page 14)

14
• The calibration buffers in calibrating order.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer:
Note: • The “OLd” message displayed beside the pH value means that
this buffer was not used during last calibration. Press and hold
down SET/CLR if you want to see calibration date (or time if old
calibration was made in the same day with current calibration).
• If “no bUF” message appears on the LCD, the instruments inform
you that calibration was performed in less than three points.
• pH resolution during calibration.
• Calibration Alarm Time-Out status:
if disabled.
or the number of days until the calibration alarm will be displayed.
or if expired (7 days ago).
CAL pH
BUF
CAL pH
BUF
CAL
BUF
CAL INTV
CAL
CAL pH
BUF