Hanna Instruments HI 3512 - Manual (Page 22)

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FOUR, THREE or TWO-POINT CALIBRATION
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press ESC after the appropriate accepted calibration point. The
instruments will return to calibration screen and will memorize the
calibration data.
SINGLE-POINT CALIBRATION
There are two selectable options for a single-point calibration:
Replace and Offset.
This option is configured in SETUP mode under the parameter First Point
Mode. In both cases the meter will alter the present calibration data in
the instrument. If
“Replace” is selected a new calibration point will be
added to the existing data, and the slope is calculated. The slopes
between current buffer and nearest lower and higher buffers will be
reevaluated.
If the “Offset” option is selected, an electrode offset correction is
performed to all buffer data keeping the existing slopes unchanged.
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press ESC after the first calibration point was confirmed. The instruments
will memorize the single-point calibration data and will return to
calibration screen.
Notes: • Press MTC key to toggle between pH buffer selection and the
temperature reading during calibration while temperature
probe is disconnected (
MTC mode).
• The displayed arrow is moving to the temperature value.
Use ARROW keys in order to change the temperature.
ERROR SCREENS
Wrong temperature
The calibration cannot be confirmed.
If the temperature is less than 0 °C or greater than 100 °C during
calibration, the calibration cannot be confirmed.