12 Modes
12.1 Calibration
Prior to measuring, it is necessary to calibrate the tensiometer. Generally, the
device should be calibrated after any change at the sensor head and after
changing or externally cleaning the capillary. If the readings are considerably
different from the values given by Teitelbaum (refer to Surface Tension of
Water) when measuring clear water, then the device needs to be calibrated
as well. Please, consider the influence of the temperature on the surface
tension when comparing the readings with the table in Surface Tension of
Water.
For calibrating the tensiometer, the sensor head’s capillary and temperature
sensor must be immersed in water. Lower the sensor head until the water
surface is within the grey marking on the temperature sensor.
Then, press the menu key and choose the menu item CALIBRATION using
the cursor keys . The calibration window will be shown in the display
after pressing the ENTER key. You can start the calibration by pressing
"start". If a measurement is running at this moment you need to press the left
software key ("yes") in order to terminate the measurement.
The water used for calibration must be free of any surface
active substances. If you are uncertain about the water
quality, use distilled or de-ionised water.
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