Benchtop pH/ISE Meter Instruction Manual
Overview of Meter Functions 520Aplus,525Aplus,720A plus and 920Aplus 103
Key 4 Hold
Pressing hold (4) acts as a toggle changing the hold setting. This function
freezes the display when the electrode signal is stable. The prompt line
verifies your selection then returns to the measure mode.
Example: HOLD ON.
When hold is turned on, the ready mode is automatically turned on. When
the display is frozen, press measure to reactivate the display and analyze
another sample.
The hold designation appears as HOLD (520Aplus) or HLD (525Aplus,
720Aplus and 920Aplus) in the prompt line and replaces the RDY when it
is displayed on the 920Aplus.
Incremental Techniques (920Aplus only)
Pressing 2nd then inc tech (4) accesses incremental techniques on the
920Aplus. Incremental techniques are additional measurement techniques
for analysis with ion selective electrodes. Both Single and Double Known
Addition and Known Subtraction can be performed using this function. See
the 920Aplus (special features) section for a complete description.
Key 5 Resolution
Press resolution (5) for selection of resolution in pH mode. Up to three
places beyond the decimal may be selected. For example, the pH display
will change from 7.000 to 7.0 to 7.00 to 7.000 with each keypress.
On the 720Aplus and 920Aplus, press resolution (5) for resolution
selection in concentration mode. Select up to three significant digits. For
example, the display will change as follows: 1.45 to 1 to 1.5 to 1.45.
The lower the resolution selected, the faster the ready indicator will be
displayed. The choice of greater accuracy, i.e. higher resolution, or greater
speed, is up to the user and may be changed to suit the analysis
being performed.
It is recommended that the display resolution be selected prior to
calibration and measurement. Calibration and measurement should take
place at the same resolution. Calibrating at one resolution, then selecting a
higher resolution for measurement is not recommended.
Содержание 410Aplus
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