Hanna Instruments HI 4521 User Manual
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available buffers and you can choose the one used.
Manual Selection
–
the desired pH buffer is manually selected from all available buffers, regardless of measured value.
To select the Buffer Entry Type:
• Use
or
to select the Calibration option.
• Press
and use
or
to highlight the
Buffer Entry Type option.
• Press
and use
or
to highlight the
desired option.
• Press
to confirm your selection or press
to
cancel operation.
1st Cal. Point
Two options are available for the 1st Cal.: 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:
• 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 (standard buffers), the Edit Custom Buffers option
is available, allowing you to set the desired pH buffers. Up to five pH custom buffers can be set.
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Make sure the TDS factor has been set before taking TDS measurements (see
TDS Setup section).
DIRECT MEASUREMENT
To measure the TDS of a sample using the
Direct reading mode:
• Press
and then
to select TDS measure mode.
• Select the
Direct reading mode (see TDS Setup section).
• Proceed as for the conductivity measurement (see
Conductivity
Measurement section).
DIRECT/AUTOHOLD MEASUREMENT
To measure TDS of a sample using the
Direct / AutoHold reading mode:
• Select the
Direct / AutoHold reading mode (see TDS Setup
section).
• Proceed as for the conductivity measurement. (see
Conductiv-
ity Measurement section)
T D S M E A S U R E
T D S M E A S U R E
T D S M E A S U R E
T D S M E A S U R E
T D S M E A S U R E MENT
M E N T
M E N T
M E N T
M E N T