Operational Guide 21
edge’s pH meter operation is con gured by using the SETUP key with a pH probe
connected to the meter. The parameter-speci c options will be seen inserted
into the menu. If Basic mode is “On”, the pH parameter list will not be displayed.
See Basic mode for a description of this operation before choosing how to
SETUP the meter.
Option Description Choices Default Basic mode
Basic Mode
When “On”, a limited set of
parameters and calibration
bu ers are available for
use.
O or
On
O Available
Information
Visual indication of bu ers
used, Probe Condition
and Response times are
determined and displayed
when calibration uses 7 and
4 and/or 10 pH bu ers.
O or
On
On
Bu ers used, probe
conditions, and
response times are
not displayed.
First Custom
Bu er
When “On”, it permits the
user to enter a custom pH
bu er value to use during
electrode calibration.
O or
value
O Not Available
Second
Custom Bu er
When “On”, it permits the
user to enter a custom pH
bu er value to use during
electrode calibration.
O or
value
O Not Available
First
Calibration
Point
Allows the user to choose
how the rst point in
calibration will be made.
O set
or point
O set
Not Available
(automatically uses
O set).
Resolution
Allows the user to select
between 0.01 and 0.001 pH
resolution.
0.01 or
0.001
pH
0.01 pH
Not Available
(automatically uses
0.01 pH resolution).
Set Out Of
Calibration
Range
When set to “On”, a
measurement that is
outside the calibrated
range (bu ers used) will
trigger a warning message.
O or
On
On
Not Available, No
Error messages
displayed.
pH Meter
Con gurations
pH
Calibration
Calibration in Standard Mode
pH operation in standard mode o ers full function of edge
pH
®. This includes
seven standard bu ers and two custom ones. Five pH bu ers may be used for
calibration.
The instrument should be recalibrated whenever:
• High accuracy and sensor veri cation are required.
• The pH electrode is replaced.
• At least once a week.
• After testing aggressive chemicals.
• If ”CAL DUE” is displayed on the third LCD line.
Every time you calibrate the instrument use fresh bu ers and perform electrode
maintenance as required. It is advised to choose calibration bu ers that bracket
the sample pH.
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