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4.2
Calibrating
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To check whether an adjustment has been carried out correctly or to determine the
deviations between measured values and expected values, the device can be
calibrated.
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For calibration, a sample usually a calibration standard is measured with a known
setpoint. Comparing the measurement result of the device with the setpoint will
reveal deviation of the device.
Calibrating
REQUIREMENT
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Switch on the device.
PROCEDURE
1. Pour about 0.4 ml 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. Briefly press the ZERO button once.
5. Check that the displayed reading is between nD 1.3327 and 1.3333.
The device displays the refractive index of distilled water for 20 °C.
Due to the tolerances of the refractometer, the range of the expected
measured value is given.
6. Carefully clean the measuring prism with a soft, dry cloth.
RESULT
Calibration of the device with distilled water has been carried out.
If the measured value at the measuring temperature lies beyond the tolerances,
repetition of the measurement is recommended after thorough and residue-free
cleaning of the prism.
If the deviation remains unchanged, an adjustment should be carried out.
If the refractometer is to be calibrated with (certified) calibration standards, this
can be done with measurements obtained via the READ button.
Instruction Manual DR201-95
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Version 3.1 © A.KRÜSS Optronic 2022
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Page 15 of 30
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