8. Menu Cal – calibration
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I
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8.
Menu Cal – calibration
Note
The calibration of a conductivity cell is meant as validation and only during
start-up as adjustment, because a change of the cell constant ususally
caused by pollution of the cell. Obviously an adjustment to the current
pollution shouldn´t be done instead cleaning the cell.
Set the controller to MAN or HOLD: MAN stops the controller, all other functions are still active. HOLD
stops the controller, all outputs are frozen to the last value and the alarm relay is deactivated.
You can calibrate conductivity and TDS with a reference measurement or a reference solution to deter-
mine the c value or the TDS factor. Additionally a Zeropoint calibration is possible to eliminate possible
influences by e.g. cable.
Select the symbol CAL to enter the submenu calibration. Here you find
three symbols: REFERENCE, ZEROPOINT, and INFO.
8.1.
Conductivity calibration – reference
Note
You can leave the calibration menu any time with ESC, and with touch screen
operation also with the HOME symbol.
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Select the symbol reference to start the calibration.
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If you use a solution with known conductivity take care that the sensor is free hanging and a least
the electrodes or for a metal sensor the complete shaft immerses. There should be no gas bubbles
at the electrodes and the probe should be complete mixed.
˃
I you use a reference measurement for calibration measure the conductivity at the same place
where the online measurement measures. If this is not possible take a representive sampel. Keep
in mind to use for both measurements the same compensation and reference temperature.