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.

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For all models, zero sets by water.

About the volume of the sample.

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Place approximately 0.3 ml of water onto the prism surface.

About the measurement of a cold or hot sample.

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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.

About the Maintenance.

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• 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.

About the Brix (%) Scale.

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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.