Hanna Instruments HI 4221 - Manual (Page 22)

22
1st Cal. Point
Two options are available for the 1st Cal. Point parameter: Point and Offset.
If Point option is selected, the slope values adjacent to the calibration points will be reevaluated (normal calibration).
If at least a two-point calibration has been performed and an offset correction of the electrode is wanted
(maintaining the existing slope values), perform a one-point calibration using the Offset option.
To set the 1st Cal. Point:
• Press
while in pH Measure mode.
• Press .
• Use or to select the Calibration option.
• Press and use or to highlight the 1st
Cal. Point option.
• Press and use or to highlight the
desired option.
• Press to confirm your selection or press to
cancel operation.
Edit Custom Buffers
If you want to use other buffers than the ones already memorized, the Edit Custom Buffers option is available,
allowing you to set the desired pH buffers. Up to five pH custom buffers can be set.
To edit/set the Custom Buffers:
• Press
while in pH Measure mode.
• Press .
• Use or to select the Calibration option.
• Press and use or to highlight the Edit
Custom Buffers option.
• For a previous set value, press to set the custom buffer value
to “----” if desired and confirm the setting by pressing ,
otherwise press to edit the selected custom buffer.
• While in edit custom buffer menu press to set the custom
buffer value to 7.000 pH and then use or to set
the desired custom buffer value.