Calibration / Adjustment - Burkert 8285 El. COND Mode D'emploi

Calibration and adjust-
ment

Calibration / Adjustment

Note: Function check active
Current outputs and relay contacts behave as configured
• Calibration: Detecting deviations without readjustment
• Adjustment: Detecting deviations with readjustment
Caution:
Without adjustment every conductivity meter delivers an imprecise or wrong
output value! Every conductivity sensor has its individual cell constant.
To determine the correct conductivity value, the conductivity meter must
be adjusted to the sensor. From the sensor signal and the cell constant, the
meter calculates the conductivity value to be displayed.
Procedure
Every conductivity sensor has its individual cell constant.
Depending on the sensor design, the cell constant may vary over a wide
range. As the conductivity is calculated from the measured conductance and
the cell constant, this must be known to the measuring system. For calibra-
tion or sensor standardization, either the known (stamped on) cell constant
of the conductivity sensor used is entered in the measuring system or it is
determined automatically by measuring a calibration solution with a known
conductivity. The data are stored in a calibration record. By "Adjustment"
the determined calibration data can be used for correction (see following
page).
• Use only fresh calibration solutions!
• The calibration solution used must have been selected during parameter
setting.
• Calibration accuracy decisively depends on the exact detection of the
calibration solution's temperature. Using the measured or entered
temperature, the analyzer determines the nominal value for the
calibration solution from a stored table.
• Observe the response time of the temperature probe!
• For exact determination of the cell constant, wait until the temperature
probe and calibration solution have the same temperature.
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