pH 1970i
Operation
27
ba75690e01
01/2007
Note
At this point, the AutoCal DIN calibration can be terminated with
<M>
.
This corresponds to a
single-point calibration
. To do this, the instru-
ment uses the Nernst slope (-59.2 mV/pH at 25 °C) and determines the
asymmetry of the electrode.
1
Press the
<CAL>
key repeatedly until the
Ct1
display indicator
and the
Auto 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).
2
If necessary, enter the temperature of the buffer solution with
<
▲
> <
▼
>
.
3
Immerse the pH electrode in the first buffer solution.
4
Press the
<RUN/ENTER>
key.
The
AR
display indicator flashes.
The electrode voltage (mV) or the buffer nominal value ap-
pears on the display. Example:
5
When the measured value is stable,
Cd2
appears.
REL1
TEC
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
C
2 4 8
d 1
°
C
TP
Cal
Auto
TEC
TEC
REL1
REL1
Sal
mV
S
/
1
Sal
O
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
m
cm
S/
%
mg/ l
2 4 8
°
C
TP
AR
Cal
Auto
/
1
O
S
LoBat
nLF
Lin
Oxi
Tref25
Tref20
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
m
cm
S/
%
mg/ l
2 4 8
°
C
TP
mV
AR
Cal
Auto
pH
4 0 1
1 7 7
ARng
pH
