Calibration/Zero Point Calibration; Measuring - KERN ORD 45BM, ORD 92BM, ORD 85BM, ORD 92HM, ORD 1SM, ORD 3SM, ORD 2WM, ORD 1PM, ORD 2UM, ORD 5UM, ORD 6 US, ORD 1RS Operating Instructions Manual

8 Calibration/zero point calibration

The refractometer's zero position must be inspected prior to initial use and periodical-
ly thereafter. A zero point calibration should be performed at least once daily and pri-
or to any measurement where the highest possible accuracy is required, or when
moving to a different environment with a different ambient temperature. For the ma-
jority of models all you need for calibration/zero point calibration is distilled and de-
ionised water. Ideally, the ambient and calibration liquid temperature should be be-
tween 10 °C and 30 °C (50 °F–86 °F) during calibration.
Calibration liquid with 60% sugar is required for a variety of models.
You should be aware of the adjustment condition when using a measuring instru-
ment.
1. Inspect the prism to ensure that the surface is clean and dry.
2. Apply a few drops of the calibration liquid onto the prism window.
3. Press the CAL button [6] for five seconds; the measuring instrument begins
the zero point calibration process.
4. The measuring instrument is performing the calibration process when 'CAL3',
'CAL2', 'CAL1', 'CAL0' appear in the display.
5. When the calibration process is complete this is shown in the display
6. Calibration liquids vary, depending on the measuring range of the instrument.

9 Measuring

1. Inspect the prism window [3] to ensure it is clean and dry.
9 ORD-BA-e-1510