Hanna Instruments HI 2550 - Manual (Page 24)

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• The pH calibration slope (the GLP slope is the average of the calibration
slopes; the percentage is referred to the ideal value of 59.16 mV/pH).
• The calibration buffers in order.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer:
The fourth pH calibration buffer:
The fifth pH calibration buffer:
Notes: • The “OLd” message displayed beside the pH value means
that this buffer was not used during last calibration. Press
and hold down the SETUP key if you want to see calibration
date (or time if old calibration was performed on the same
day as the current calibration).
• If “no bUF” message appears on the LCD, the instrument
informs you that calibration was performed in less than
three points.
CAL pH
BUF
CAL pH
BUF
CAL pH
BUF
BUF
CAL
• Calibration Expiration status:
- if disabled.