Conductivity: Determining The Cell Constants - wtw Multi 340i Mode D'emploi

Conductivity: Determining the cell constants

Procedure
Calibration
evaluation
C A L
1/
0 7 4 2
Tref25
Cal
C A L
1/
4 3
0 7
Tref25
Cal
10
Conductivity: Determining the cell constants
The cell constants are determined in the control standard 0.01 mol/l KCl.
After the calibration, the measuring instrument automatically evaluates the
current status of the calibration. The evaluation appears on the display.
Display
E3
Invalid calibration
Procedure for determining the cell constants:
l Connect a conductivity measuring cell to the measuring instrument.
If necessary, press the <M> key repeatedly until the status display
(conductivity measurement) appears.
l Press the <CAL> key. Depending on the calibration status, the
display appears as well as:
– the current, calibrated cell constant (with sensor symbol on the
cm
display) or
– the fixed cell constant 0.475 1/cm (without sensor symbol on the
display). In this case, the measurement parameters are initialized.
Note
At this point, the procedure can be terminated with <M>.
l Immerse the conductivity measuring cell in the control standard solution,
0.01 mol/l KCI.
l Press <RUN/ENTER>. The AutoRead measurement begins.
l When the measured value is stable, the instrument displays the deter-
mined cell constants and the calibration evaluation. The measuring in-
strument automatically stores the cell constants.
cm
l Switch to the measuring mode with <M>.
-1
Cell constant [cm
-1
0.450 ... 0.500 cm
Outside the range
-1
0.450 ... 0.500 cm
Multi 340i
]
CAL