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Transmitter 9135 - pH/redox measurement
Ph CALIB.
Auto
TYPE
:
TAMP
: NIST
Page 34
The temperature of the buffer solution needs to be
entered only if the transmitter is operated in the
manual temperature-compensation mode.
In the « automatic calibration » mode the transmitter
determines
the
temperature. In the other calibration modes, the
nominal pH values must always be taken into
account.
For a precise calibration of the pH electrode, 2 buffer
solutions are required one of which should have a
pH close to the sample pH. The pH 7 buffer solution
(or
6.88
to
25°C)
standardization and a pH 4 buffer solution (or 4.01
to 25°C) or pH 10 (or 9.22 to 25°C) is required to
calibrate the electrode slope.
Choice of the calibration type
Different calibration types may be selected. In the
CALIBRATION menu :
•
Press CHOICE to select pH standard.
•
Press Enter.
•
Press CHOICE to select PROGRAMMING
•
With
the
right
calibration type.
Automatic calibration
With the right function key, select the buffer type you
use so that the instrument determines precisely the
buffer value according to the temperature.
You have the choice between three tables : NIST,
DIN 9, DIN 10 which corresponds to the standard
buffer values whose value varies according to the
temperature as indicated in the previous chapter
dedicated to the buffer solutions.
pH
value
according
is
required
function
key,
to
the
for
a
first
choose
the
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