wtw Multi 197i Operating Manual page 41

Multi 197i
Calibration evaluation
Determining the
cell constant
ba75339e04 07/2009
After the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the dis-
play.
Display
E3
Perform error elimination ac-
cording to chapter 6 W
...
IF
You can determine the cell constant as follows:
1 Press the <CAL> key repeatedly until the status display
CAL appears.
2 Press the <RUN/ENTER> key. The CAL display appears, as
well as
– the current, calibrated cell constant (with sensor symbol on
the display) or
– the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measurement parameters
are initialized. See "Reset" on page 62..
pH S
C A
1
O
Sal
Time Baud 0 4 7 2
Day.Month No.
Year Ident
Tref25 Tref20 Auto
LoBat nLF Lin Oxi Cal TEC
3 Immerse the conductivity measuring cell in the control standard
solution, 0.01 mol/l KCI.
4 Press the <RUN/ENTER> key.
The AutoRead measurement to determine the cell constant
starts. The AR display indicator flashes until a stable signal is
reached. The cell constant determined is displayed. The mea-
suring instrument automatically stores the cell constant.
Cell constant [cm
0.450 ... 0.500 cm
Outside the range
0.450 ... 0.500 cm
HAT TO DO
mV / pH pH S
L
1
% mg/l
O
S/
m
Sal
cm
1/ cm Sal
Time
C
°
Day.Month
/
% K
TP
Year
REL1 REL2
ARng AR RCL LoBat
Operation
-1
]
-1
-1
mV
C A L
% mg/l
m
1/
Baud 0 4 7 5
°
No.
Ident
Tref25 Tref20 Auto
nLF Lin Oxi Cal TEC ARng
/ pH
S/
cm
cm Sal
C
/
% K
TP
REL1 REL2
AR RCL
41