pH 1970i
Operation
29
ba75690e01
01/2007
Note
At this point, the AutoCal DIN calibration can be terminated with
<M>
.
This corresponds to a
two-point calibration.
The instrument uses the slope and asymmetry of the calibration
range I.
Three-point calibration
Note
You can prematurely terminate the three-point calibration by pressing
<M>
. The values of the two-point calibration for slope and asymmetry
will then remain stored.
11
Press the
<RUN/ENTER>
key. The instrument displays the
value of the asymmetry in calibration range I.
TEC
REL1
1
S
5 9
pH
/
TP
Sal
cm
1/
K
/
%
2 4 8
°
C
Year
Ident
Store
AR
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
No.
Day.Month
Baud
RCL
REL2
m
cm
S/
%
mg/ l
Sal
O
pH
2
Cal
Auto
mV
12
Press the
<RUN/ENTER>
key
to continue the
three-point calibration
.
Cd3
appears on the display.
13
Thoroughly rinse the electrode with distilled water.
14
If necessary, enter the temperature of the third buffer solution
with
<
▲
> <
▼
>
.
15
Immerse the pH electrode in the third buffer solution.
16
Press the
<RUN/ENTER>
key.
The
AR
display indicator flashes.
The electrode voltage (mV) or the buffer nominal value ap-
pears on the display.
When the measured value is stable,
AR
disappears.
The instrument displays the value of the slope (mV/pH) and the
evaluation of the calibration in calibration range II.
17
Press the
<RUN/ENTER>
key.
The instrument displays the value of the asymmetry in calibra-
tion range II. The three-point calibration is completed.
18
To return to the measuring mode: Press the
<M>
key.
