KERN ABT-A01 Operating Manual

Contents

9 User Instructions• To form a reproducible mean value several density measurement are necessary• Remove fat from solvent-resistant sample / /glass sinker /beaker.• Regularly clean sample dishes/glass sinker/beaker, do not touch immersed partwith your hands• Dry sample/glass sinker/pincers after each measurement.• Adjust sample size to sample dish (ideal sample size > 5 g).• Only use distilled water.• When immersing for the first time, lightly shake sample dishes and sinker, in orderto Dissolve air bubbles.• Always ensure that, when re-immersing into the liquid no additional bubblesadhere; it is better to use pincers to place the sample.• Remove firmly adherent air bubbles with a fine brush or a similar tool.• To avoid adherent air bubbles smoothen samples with rough surface.• Take care that no water drips onto the upper sample dish when weighing with thehelp of tweezers.• In order to reduce the surface tension of water and the friction of the liquid on thewire, add three drops of a common detergent (washing-up liquid) to themeasuring liquid (density modification of dest. water occurring due to the additionof tensides can be ignored).• Oval samples can be held more easily with pincers when you cut grooves intothem.• The density of porous solids may only be determined approximately. Buoyancyerrors occur when not all the air is eliminated from the pores during immersion inthe measuring fluid.• To avoid great vibrations of the balance, place sample carefully.• Avoid static charge, e. g. dry glass plummet with cotton cloth only.• If the density of your solid only deviates slightly from that of distilled water,ethanol may be used as measuring fluid. However, check beforehand whether thesample is solvent-proof. In addition you must observe the applicable safetyregulations when working with ethanol.• Handle glass sinker with care(no warranty claims in case of damage).ABT-A01-BA-defsi-0710 43

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