Digital Hand-Held "Pocket" Refractometer PAL
About the calibration.
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. |
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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.
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. |
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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.
