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Once a stable value has been determined, the device will save the correction
factor and return to measurement mode, or it will display an error message if
necessary.
The resulting relative cell constant is briefly shown and can always be viewed
in the "SEt ConF" menu under the parameter "CELL Corr".
7.2.3 Error messages during calibration
Display
CAL.-Err.1
CAL.-Err.2
CAL.-Err.3
CAL.-Err.4
7.3
Determining the relative time constant with a calculation
As an alternative to calibrating the relative time constant, this can also be
determined using a calculation and manually entered on the device using the
parameter "CELL Corr". A reference solution is also required for this purpose.
The calculation is carried out as stated in the following example.
Example
KCl solution with the concentration 0.1 M: 1413 µS/cm at 25°C
(At other temperatures, switch off the temperature compensation (t.Cor = oFF)
and use the conductivity value that corresponds to the temperature!)
Assumption: Conductivity
("CELL Corr") out of 1.000
Conductivity of the solution at 25 °C (conductivity
Relative cell constant k =
In this example, the parameter "CELL Corr" must be set to the value "0.942".
All manuals and user guides at all-guides.com
The main display of the device shows the measured actual
value (e.g. 1407 µS/cm) and the subsidiary display shows
"CAL." with a symbol rotating around the last digit.
Meaning
Relative cell constant too large Determined
Relative cell constant too small Determined
Solution in incorrect range
Incorrect temperature
display
7 Calibration
Explanation
relative
must not be > 1.2
relative
must not be < 0.8
Incorrect
reference
beyond the tolerance
Reference solution outside the per-
missible temperature (0.0 to 34.0 °C,
or 0.0 to 27.0 °C with reference solu-
tion 111.8 mS/cm)
-1
= 1500 µS × cm
at set relative cell constant
) = 1413 µS × cm
target
cell
constant
cell
constant
solution,
way
-1
35
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