Hanna Instruments HI 504 - Manual (Page 45)

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• If an offset calibration has been
made, the instrument will turn to
“slope” calibration (as indicated by
the “SLO” message on the second-
ary display. The slope value is shown
on the primary LCD and the first digit
is blinking to permit modifications).
• Press the æ or key to modify the value or key to move
to the next digit.
• Once selected the desired value, press CFM to confirm.
• After confirmation the instrument will turn back to normal
mode.
• If the slope is invalid, the ”WRONG” indicator will blink
on the LCD.
Note Press LCD or CAL DATA key to exit calibration. The slope will
be set to the default value (57.5 mV/pH).
Note After direct selection of offset and slope, calibration data can
be viewed by pressing the CAL DATA key while in normal
mode, but no pH-buffer values will be displayed during the
data scrolling on the LCD.
OFFSET AND SLOPE DIRECT SELECTION
It is possible to edit directly the values of the offset and the
slope to calibrate the instrument.
• Press the CAL DATA key entering the last calibration data
scrolling and then press the SETUP key.
• A password entry is required. If a wrong password is con-
firmed, the instrument reverts back to the normal mode.
• Otherwise, if correct password is con-
firmed, the LCD will appears as
follows: the secondary LCD shows
“OFF” to indicate “offset” while the
primary one shows offset default
value. The first digit on the primary
LCD is blinking, and it is possible to
change it by pressing
æ or key.
• Pressing the key will move to the
second digit while the first one will
be fixed.
• Pressing repeatedly the key will move cyclically through
the digits of the primary LCD.
• Once selected the desired value, press CFM to confirm the
calibration offset.
• If the offset is invalid, the “WRONG”
indicator will blink on the display.
Note If LCD or CAL DATA key is pressed before CFM, calibration
is aborted without changing the previous calibration data.