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6.6 Conductivity calibration settings
Calibration standard
Predefined conductivity standard
The following five predefined standards are available:
10
μS/cm
Customized conductivity standard
For those who use their own conductivity standard for calibration of the conductivity sensor, the conductivity of
the calibration standard (in mS/cm) can be entered in this screen. Up to 5 temperature-dependent values can
be entered in the table.
Lowest possible special standard: 0.00005 mS/cm (0.05 µS/cm).
This value corresponds to the conductivity of natural water at 25 °C, exclusively caused by the autoprotolysis
of water.
When switching from a predefined standard to customized standard, you should always save the table even if
there are no changed values.
Cell constant
If the cell constant of the conductivity cell being used is accurately known, it can be entered directly in the
meter.
1 Select Enter Cell Constant in the menu.
2 Press CAL in the measurement display.
The request to enter the cell constant appears.
Calibration Reminder
For a full description, see "pH/ion calibration settings."
6.7 Conductivity measurement settings
Reference Temperature
Two reference temperatures are available: 20 °C and 25 °C.
Temperature Correction
There are three options:
linear
non-linear
off
With most solutions, a linear interrelationship between conductivity and temperature is given. In such cases,
select the linear correction method.
The conductivity of natural water shows strong non-linear temperature behavior. For this reason, use the non-
linear correction for natural water.
In some cases, for example, when measuring according to USP/EP (United States/European Pharmacopoeia)
you need to switch off the temperature correction. This can also be done by entering a linear temperature
correction factor of 0 %/°C.
Linear
When selecting linear correction, the input window for the temperature correction coefficient (0.000 – 10.000
%/°C) appears.
The measured conductivity is corrected and displayed using the following formula:
GT
= GT/(1 + ( (T – T
Ref
Definitions
GT = conductivity measured at temperature T (mS/cm)
GT
= conductivity (mS/cm) displayed by the instrument, calculated back to the reference temperature T
Ref
= linear temperature correction coefficient (%/°C);
SevenGo Duo pro™
84
500
μS/cm
μS/cm
))/100 %)
Ref
1413
μS/cm
= 0: no temperature correction
12.88
mS/cm
Ref
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