KERN PBS-A03 Operating Instructions Manual
Also see for PBS-A03: Operating instructions
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Contents
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PBS-A03/A04-BA-e-1213 219 User Instructions• To form a reproducible mean value several density measurement are necessary• Remove fat from solvent-resistant sample / sinker /beaker.• Regularly clean sample dishes/ sinker/beaker, do not touch immersed part with yourhands• Dry sample/ 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 order toDissolve air bubbles.• Always ensure that, when re-immersing into the liquid no additional bubbles adhere; itis 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 the helpof tweezers.• In order to reduce the surface tension of water and the friction of the liquid on the wire,add three drops of a common detergent (washing-up liquid) to the measuring liquid(density modification of distilled water occurring due to the addition of tensides can beignored).• Oval samples can be held more easily with pincers when you cut grooves into them.• The density of porous solids may only be determined approximately. Buoyancy errorsoccur when not all the air is eliminated from the pores during immersion in themeasuring fluid.• To avoid great vibrations of the balance, place sample carefully.• Avoid static charge, e. g. dry sinker with cotton cloth only.• If the density of your solid body just deviates slightly from that of distilled water, ethanolmay be used as measuring liquid. However, check beforehand whether the sample issolvent-proof. In addition you must observe the applicable safety regulations whenworking with ethanol. |
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