wtw pH 197i Operating Manual page 22

Calibration
pH S mV
1 C T 1
O % mg/l
S/
m
Sal
1/ cm
Time Baud
8 2 4 8
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
pH S mV /
1 C T 2
O % mg/l
S/
m
Sal
1/ cm
Time Baud
8 2 4 8
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
pH S mV/
- 5 9 4
O % mg/l
S/
m cm
Sal
pH S mV
2
1
O mg/l
S/
Sal
pH S mV /
C T 3
1
O % mg/l
S/
Sal m
1/ cm
Time Baud
8 2 4 8
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
22
AutoCal TEC / AutoCal DIN procedure:
The following example shows the AutoCal TEC calibration. In the
AutoCal DIN calibration, Cd... appears on the display instead of Ct....
Otherwise, both procedures are identical.
The selection of the calibration procedure, AutoCal TEC (display Ct1) or
AutoCal DIN (display Cd1) is made with the <CAL> key.
l Connect the pH electrode to the measuring instrument.
l Press the <CAL> key repeatedly until the Ct1 display indicator and the
/ pH
Auto Cal TEC function display appear. The sensor symbol displays the
cm
evaluation of the last calibration (or no sensor symbol in the delivery state
Sal
or after the measuring parameters have been reset).
/
K
TP
l Immerse the pH electrode in the first buffer solution.
REL2
RCL
l When measuring without a temperature sensor:
Enter the temperature of the first buffer solution with <L> <M>.
l Press <RUN/ENTER>. The AutoRead measurement begins. The
electrode voltage (mV) or the buffer nominal value (see C
appears on the display. When the measured value is stable, Ct2
appears.
Note
pH
At this point, the AutoCal TEC calibration can be terminated
cm
with <M>. This corresponds to a single-point calibration. To
Sal
do this, the instrument uses the Nernst slope (-59.2 mV/pH at
/
K
TP
25 °C) and determines the asymmetry of the electrode.
REL2
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>.
l Press <RUN/ENTER>. The AutoRead measurement begins. The
electrode voltage (mV) or the buffer nominal value appears on the
display.
l When the measured value is stable, the instrument displays the value of
pH
the slope and the evaluation of the two-point calibration.
l Press <RUN/ENTER>. The instrument displays the value of the
pH
asymmetry.
cm
Note
pH
At this point, the AutoCal TEC calibration can be terminated
cm
with <M>. This corresponds to a two-point calibration.
Sal
/ K
TP
REL2
RCL
pH 197i
)
ONFIGURING