9
109118-1 Rev. A,10/96
2.4 Changing the Calibration Buffer Settings (cont)
The buffers cannot be changed while the meter is reading. If the
decimal is flashing (meter reading) press the key to freeze
the display.
To review or change the buffers currently in memory press
The meter will indicate that you are looking at buffer #1
and the value will be flashing indicating that it can be changed.
Change the displayed value using and press
The second buffer is then displayed. Change as before and repeat
for the third buffer.
Press to return to the pH display.
For reasons of automatic recognition, buffers cannot be set closer
than 2 pH units from each other. You also cannot move one
buffer value past another. For changes on the low end, change
buffer #1 first and for changes on the high end change buffer #3
first. During calibration the meter will let you calibrate on two of
the three buffers in memory. It does not matter which buffer #
you calibrate on first.
The standard buffers that this meter will recognize and
temperature compensate are as follows:
buffer 1.68 4.00 4.01 6.86 7.00 9.18 9.21 10.01 non std.
indicator 2447 79910X
2.5 mV Measurements
The millivolt capability of pH meters can be used to determine
the actual slope of pH electrodes but is most frequently used for
doing potentiometric readings or titrations with Platinum
Oxidation-Reduction electrodes.
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