Hanna Instruments HI 110 - Manual (Page 13)

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• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is
stable.
• When the reading is stable and close to the selected buffer, the
“READY” tag will be displayed and the “CFM” tag will blink.
• Press CFM to confirm calibration.
• If the fifth calibration point is reached, the instrument stores
the calibration value and returns to normal measurement
mode, or else it goes to the next calibration point.
TWO-POINT CALIBRATION
• Proceed as described in “THREE-/FIVE-POINT CALIBRATION” section.
• Press CAL after the second calibration point was confirmed. The instruments
will memorize the two-point calibration data and will return to measurement
mode.
ONE-POINT CALIBRATION
Two SETUP selectable options are available: “Pnt” and “OFFS”.
If the “Pnt” option is selected, the new calibration point overrides an existing
one. The adjacent slopes will be reevaluated.
If the “OFFS” option is selected, an electrode offset correction is performed
keeping unchanged the existing slopes.
• Proceed as described in “THREE-/FIVE-POINT CALIBRATION” section.
• Press CAL after the first calibration point was confirmed. The instruments will
memorize the one-point calibration data and will return to measurement
mode.
Note: • If the value measured by the instrument is not close to the
selected buffer, “WRONG” “ ” and “WRONG” “ ” tags will blink
alternately. In this case check if the correct buffer has been used,
or regenerate the electrode by following the Cleaning Procedure
(see page 30). If necessary, change the buffer or the electrode.
• When a custom buffer is displayed, the “BUFFER pH” tag blinks.
To change the custom buffer value in according with the buffer
temperature proceed as described in “WORKING WITH CUSTOM
BUFFERS” paragraph (see page 14).
• If the buffer temperature or the manual temperature exceeds the
temperature limits of the buffer, “WRONG” tag and temperature
reading will blink.
• If “WRONG”, “BUFFER pH” tags and “OLD” message are displayed
blinking on the secondary LCD line, an inconsistency between new and
previous (old) calibration is detected. Clear calibration parameters
and proceed with calibration from the current calibration point. The
instrument will keep all confirmed values during current calibration.