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• Calibration: Detecting deviations without readjustment
• Adjustment: Detecting deviations with readjustment
Calibration / Adjustment
Note: HOLD mode active for the currently calibrated module
Current outputs and relay contacts behave as configured
NOTICE:
Without calibration every conductivity meter delivers an imprecise or wrong
output value! Mechanical tolerances of the sensor as well as magnetic crosstalk
between send and receive coils reduce the measurement accuracy.
To increase accuracy, it is useful to perform an adjustement.
Additional measurement errors occur when the sensor is installed in a restricted
space (container wall < 4 x sensor diameter). This can be compensated for by
product calibration, for example. When measuring low conductivity values,
a zero correction is recommended.
Be sure to perform an adjustment after having replaced the sensor!
Procedure
Every conductivity sensor has its individual cell factor.
Depending on the sensor design, the cell factor may vary over a wide range.
As the conductivity is calculated from the measured conductance and the cell
factor, this must be known to the measuring system. For calibration or sensor
standardization, either the known (stamped on) cell factor of the conductivity
sensor used is entered in the measuring system or it is determined automati-
cally 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.
• Use fresh calibration solutions only!
• The calibration solution used must have been selected during parameter
setting.
• Calibration accuracy decisively depends on the exact detection of the cali-
bration solution’s temperature. Using the measured or entered temperature,
the measuring module determines the nominal value for the calibration
solution from a stored table.
• Observe response time of temperature probe!
• For exact determination of the cell factor, wait until the temperature probe
and calibration solution have the same temperature.
Calibration and adjustment
Содержание Protos CONDI 3400(X)-051
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Страница 51: ...51 Nitric acid HNO3 Hydrochloric acid HCl c by wt c by wt ...
Страница 52: ...52 Sodium hydroxide solution NaOH Table salt solution NaCl c by wt c by wt ...