FAQ for Digital Hand-Held "Pocket" Refractometer PAL-seris.


Digital Hand-Held "Pocket" Refractometer PAL


Photo: PAL-1

Question
• About the calibration.
• About the volume of the sample.
• About the measurement of a cold or hot sample.
• About the Maintenance.
• About the Brix (%) Scale.



About the calibration.


For all models, zero sets by water.

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About the volume of the sample.

Place approximately 0.3 ml of water onto the prism surface.
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About the measurement of a cold or hot sample.


After dripping a cold or hot sample on the prism, wait 20 to 60 seconds before pressing the START/OFF switch so that the samples temperature and prism temperature approximate to each other. In such a case, stir the sample with a plastic spoon 3 or 4 times on the prism to shorten the time to equalize the temperatures of the sample and prism.

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About the Maintenance.

• After measuring, use a lint-free tissue to wipe the sample off of the prism surface. If the sample contains oils or fat, use isopropyl alcohol and water to clean the prism surface.
• When not in use, keep the PAL unit in the storage case at room temperature (20°C). Avoid storing the unit in direct sunlight or in a moist environment and do not subject the unit to strong shocks or vibrations. The ambient temperature at which you can safely store the units is between 0 and 40°C.

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About the Brix (%) Scale.


All Refractometers are designed to measure the refractive index of a solutoin. The Brix scale is based on a sucrose (sugar) and water solution. However, since most samples contain substances other than sugar - such as salts, minerals and protenis - the Brix percentage repesents the total concentration of all soluble solids in the sample. For certain samples, such as cutting oils and other industrial fluids, a conversion chart from the Brix percentage to the sample's total concentration may be necessary.

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