wtw pH 197i Bedienungsanleitung Seite 24

Calibration
pH S
A S Y
1
O
Sal
Time Baud
8 2 4 8
Day.Month No.
Year Ident
Tref25 Tref20 Auto
LoBat nLF Lin Oxi Cal
pH S
7 0 2
7
O
Sal
Time Baud
8 2 4 8
Day.Month No.
Year Ident
Tref25 Tref20 Auto
LoBat nLF Lin Oxi Cal
pH
S
4 S L O
O
Sal
Time Baud
8 2 4 8
Day.Month No.
Year Ident
Tref25 Tref20 Auto
LoBat nLF Lin Oxi Cal
pH S
7 $ 5 8
O
Sal
Time Baud
8 2 4 8
Day.Month No.
Year Ident
Tref25 Tref20 Auto
LoBat nLF Lin Oxi Cal
pH S
5 9 4
-
O
Sal
pH S
1 C T
O
Sal
24
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ConCal procedure:
l Connect the pH electrode to the measuring instrument.
l Press the <CAL> key repeatedly until the ASY display indicator and the
mV / pH
Cal function display appear. The sensor symbol displays the evaluation
% mg/l
S/
m
cm
of the last calibration (or no sensor symbol in the delivery state or after
1/ cm Sal
the measuring parameters have been reset).
C
°
% / K
TP
l Immerse the pH electrode in the first buffer solution
Store REL1 REL2
TEC ARng AR RCL
(pH 7.0 ± 0.5 in two-point calibration).
l When measuring without a temperature sensor:
Enter the temperature of the first buffer solution
with <L> <M> while pressing the <RUN/ENTER> key.
l Press the <RUN/ENTER> key.
mV / pH
The measured pH value appears on the display.
% mg/l
S/
m
cm
l Set the measured value to the nominal pH value of the buffer solution (at
1/ cm Sal
C
°
the current temperature) with <L> <M>.
% / K
TP
Store REL1 REL2
l When the measured value is stable, press the <RUN/ENTER> key. The
TEC ARng AR RCL
value of the asymmetry appears.
l Press the <RUN/ENTER> key. SLO appears.
Note
mV / pH
At this point, the ConCal calibration can be terminated with
% mg/l
S/
m
cm <M>. This corresponds to a single-point calibration. To do
1/ cm Sal this, the instrument uses the Nernst slope (-59.2 mV/pH at
C
°
/ K
%
TP
25 °C) and determines the asymmetry of the electrode.
Store REL1 REL2
TEC ARng AR RCL
l To continue the two-point calibration, immerse the pH electrode in the
second buffer solution.
l When measuring without a temperature sensor:
Enter the temperature of the second buffer solution
with <L> <M> while pressing the <RUN/ENTER> key.
l Press <RUN/ENTER>.
mV / pH
l Set the measured value to the nominal pH value of the buffer solution (at
% mg/l
S/
m
cm
the current temperature) with <L> <M>.
1/ Sal
cm
C
°
/
% K
TP
Store REL1 REL2
TEC ARng AR RCL
l When the measured value is stable, press the <RUN/ENTER> key. The
mV/ pH
instrument displays the value of the slope and the calibration evaluation.
% mg/l
S/
m cm
l Press <RUN/ENTER>. The instrument displays the value of the
mV / pH
3
asymmetry.
% mg/ l
S/
m
cm
l Switch to the measuring mode with <M>.
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