Hanna Instruments HI 3221 Instruction Manual page 18

FOUR, THREE or TWO-POINT CALIBRATION
• Proceed as described in "FIVE-POINT CALIBRATION" section.
• Press CAL or ESC after the appropriate accepted calibration point. The
instruments will return to measurement mode 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 CAL or ESC after the first calibration point was confirmed. The
instruments will memorize the single-point calibration data and will
return to measurement mode.
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.
18