Determining The Cell Constant (Calibrating) - wtw Cond 1970i Operating Manual

Cond 1970i
ba75692e02 07/2009

4.3.1 Determining the cell constant (calibrating)

Note
This method of automatically determining the cell constant by calibra-
tion with the 0.01 mol/l KCL standard solution can only be used for
measuring cells with cell constants in the range 0.450 ... 0.500 cm
-1
0.800 ... 1.200 cm .
This is how you can determine the cell constant:
1 Press the <CAL> key until CELL appears on the display.
pH S
1 C T 1
O
Sal
Time Baud C E L L
Day.Month No.
Year Ident
Tref25 Tref20 Auto Store
LoBat nLF Lin Oxi Cal TEC
2 Press the <RUN/ENTER> key.
3 Press the <CAL> repeatedly, until the calibrated cell constant
appears on the display: CAL appears on the display.
pH S
C C A
O
Sal
Time Baud 0 4 7 5
Day.Month No.
Year Ident
Tref25 Tref20 Auto Store
LoBat nLF Lin Oxi Cal TEC
4 The displayed value is the current calibrated cell constant. You
can:
– accept this setting for measuring with <M> or
– continue with step 5 and start a new calibration.
5 Immerse the measuring cell in the control standard solution,
0.01 mol/KCl.
mV / pH
% mg/l
S/
m
cm
1/ cm Sal
C
°
/ K
%
TP
REL1 REL2
ARng AR RCL
mV / pH
L
% mg/l
S/
m
cm
1/ Sal
cm
C
°
/
K
%
TP
REL1 REL2
ARng AR RCL
Operation
-1
or
23