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4 Operation
4.1
Adjusting
▪
In daily use, we recommend that the device be calibrated with distilled water and
adjusted if necessary.
▪
In an adjustment, a sample, usually a calibration standard, is measured with a
known setpoint. The device is adjusted on the basis of the comparison between
the measuring result of the device and the setpoint. The adjustment permanently
changes the device and minimises the deviation between the measurement result
and the setpoint.
▪
For adjustment of the refractometer a temperature compensation for distilled water
is used. Therefore only distilled water is to be used.
▪
Before the adjustment begins, we recommend that the refractometer, the water for
adjusting and the environment have the same temperature.
Adjusting
REQUIREMENT
▪
Switch on the device.
PROCEDURE
1. Pour about 0.4 ml of distilled water onto the measuring prism.
The prism must be completely covered.
Ensure that there are no bubbles in the sample.
2. Close the lid of the device.
3. Wait for 5 seconds after pouring the water onto the prism.
4. Press the ZERO button and keep it pressed until "CAL" and "END" are displayed in
succession.
5. Carefully clean the measuring prism with a soft, dry cloth.
RESULT
The adjustment of the device with distilled water has been carried out.
To check whether the adjustment has been carried out correctly, the refractometer
can be calibrated with distilled water.
Instruction Manual DR201-95
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Version 3.1 © A.KRÜSS Optronic 2022
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Page 14 of 30
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