Calibration
pH 197i
24
ConCal procedure:
l
Connect the pH electrode to the measuring instrument.
l
Press the
<CAL>
key repeatedly until the
ASY
display indicator and the
Cal
function display appear. The sensor symbol displays the evaluation
of the last calibration (or no sensor symbol in the delivery state or after
the measuring parameters have been reset).
l
Immerse the pH electrode in the first buffer solution
(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
<
▲
> <
▼
>
while pressing the
<RUN/ENTER>
key.
l
Press the
<RUN/ENTER>
key.
The measured pH value appears on the display.
l
Set the measured value to the nominal pH value of the buffer solution (at
the current temperature) with
<
▲
> <
▼
>
.
l
When the measured value is stable, press the
<RUN/ENTER>
key. The
value of the asymmetry appears.
l
Press the
<RUN/ENTER>
key.
SLO
appears.
Note
At this point, the ConCal calibration can be terminated with
<M>
. This corresponds to a
single-point calibration
. To do
this, the instrument uses the Nernst slope (-59.2 mV/pH at
25 °C) and determines the asymmetry of the electrode.
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
<
▲
> <
▼
>
while pressing the
<RUN/ENTER>
key.
l
Press
<RUN/ENTER>
.
l
Set the measured value to the nominal pH value of the buffer solution (at
the current temperature) with
<
▲
> <
▼
>
.
l
When the measured value is stable, press the
<RUN/ENTER>
key. The
instrument displays the value of the slope and the calibration evaluation.
l
Press
<RUN/ENTER>
. The instrument displays the value of the
asymmetry.
l
Switch to the measuring mode with
<M>
.
TEC
Auto
Store
AR
1
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
/
mV
m
cm
S/
% mg/ l
Sal
O
S
pH
A
2 4 8
S Y
°
C
TP
REL1
Cal
7
TEC
Auto
Store
AR
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
/
mV
m
cm
S/
% mg/ l
Sal
O
S
pH
7
2 4 8
0 2
°
C
TP
REL1
Cal
4
TEC
Auto
Store
AR
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
/
mV
m
cm
S/
% mg/ l
Sal
O
S
pH
S
2 4 8
L O
°
C
TP
REL1
Cal
7
TEC
Auto
Store
AR
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
/
mV
m
cm
S/
% mg/ l
Sal
O
S
pH
$
2 4 8
5 8
°
C
TP
REL1
Cal
-
m
cm
S/
% mg/ l
Sal
O
S
pH
5 9 4
pH
mV/
C T
1
pH
/
m
cm
S/
% mg/ l
Sal
O
S
pH
3
mV
