Operation
pH/Oxi 340i
30
4.3.3
ConCal
Two-point calibration
For this procedure, use two buffer solutions:
l
pH 7.0 ± 0.5
l
any other buffer solution
Note
Skip the steps 2 and 8 if you use a pH electrode with a temperature
sensor or the temperature sensor of a D. O.probe.
Note
At this point, the ConCal calibration can be broken off with <M>. This
corresponds to a single-point calibration. When doing so, the instru-
ment uses the Nernst slope (-59,2 mV/pH at 25 °C) and the fixed asym-
metry of the electrode.
1
Press the <CAL> key repeatedly until the ASY display and the
Cal function display appears. The sensor symbol displays the
evaluation of the last calibration (or no sensor symbol in the de-
livery state or after the measurement parameter has been re-
set).
2
If required, enter the temperature of the first buffer solution with
<
▲
> <
▼
> while keeping the <RUN/ENTER> key depressed.
3
Immerse the pH electrode in the first buffer solution (pH 7.0 ±
0.5 in two-point calibration).
4
Press the <RUN/ENTER> key.
The measured pH value appears on the display.
5
Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <
▲
> <
▼
>.
6
When the measured value is stable, press the <RUN/ENTER>
key. The value of the asymmetry appears.
7
Press the <RUN/ENTER> key. SLO appears.
/
K
cm
Sal
1
S
O
U
8
°
F
%
1/cm
mV/pH
S/
m
cm
M
%
mg/l
mbar
Lin
Tref25
nLF
Time
Baud
Day.Month No.
Ident
Year
LoBat
AutoCal DIN
AutoCal TEC
RCL
Auto Store
ARng
AR
TDS
Sal
Tref20
8
4
2
S Y
A
pH
Cal
°
C
TP
