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YDB-03-BA-e-1410
71
7 Preconditions for Precise Measurements
There are numerous error possibilities during density determination.
Accurate knowledge and caution are required to achieve precise results when
applying this density set in combination with the balance.
7.1 Calculation of Results
The balance displays results for density determination by giving four or five decimal
places. However, this does not mean that the results are accurate down to the last
decimal place as this would be the case for a calculated value. Therefore all weighing
results used for calculations have to be examined closely.
7.2 Influence Factors for Measurement Errors
7.2.1 Air bubbles
A small bubble with a diameter of 1 mm results in a buoyancy of 0.5 mg, while those
with 2 mm Ø already produces a buoyancy of 4 mg.
Therefore, make sure that no air bubbles adhere on the solid object or sinker that is
immersed in the liquid.
An oily surface causes air bubbles when immersing in the liquid, so
degrease the solvent-resistant solid sample
clean all parts that are immersed regularly and don't touch them with bare
fingers
Don't lay solid samples (particularly flat objects) outside of the liquid on the sample
dish, because this results in air bubbles by the joint immersion.
7.2.2 Solid body sample
A sample possessing too great a volume that is immersed in liquid will result in an
increase in liquid level inside the glass pitcher. As a result, part of the suspension
bracket of the sifting bowl will also be immersed causing buoyancy to increase.
As a consequence the weight of the specimen in the liquid will drop.
Samples that change the volume or assimilate liquid are unsuitable for measurement.
Summary of Contents for KERN YDB-03
Page 9: ...YDB 03 BA d 1511 7 Adapter 3 Stück Innensechskantschlüssel Schraube ...
Page 10: ...8 YDB 03 BA d 1511 2 Abmessungen mm Gestell ...
Page 11: ...YDB 03 BA d 1511 9 Universal Tauchkorb für schwimmende und sinkende Festkörper Probenschale ...
Page 12: ...10 YDB 03 BA d 1511 Plattform Becherglas ...
Page 59: ...YDB 03 BA d 1511 57 Zurück ins Menü Wägemodus ON OFF Taste wiederholt drücken ...
Page 79: ......
Page 84: ...6 YDB 03 BA e 1410 Adapter 3 items Allen wrench screw ...
Page 85: ...YDB 03 BA e 1410 7 2 Dimension mm Frame ...
Page 87: ...YDB 03 BA e 1410 9 Platform Beaker ...
Page 134: ...56 YDB 03 BA e 1410 Back to menu weighing mode press ON OFF key repeatedly ...
Page 153: ......
Page 158: ...6 YDB 03 BA f 1410 Adaptateur 3 pièces Clé six pans creux vis ...
Page 159: ...YDB 03 BA f 1410 7 2 Dimensions mm Bâti ...
Page 161: ...YDB 03 BA f 1410 9 Plate forme Gobelet ...
Page 207: ...YDB 03 BA f 1410 55 Retour au menu mode de pesée répéter l appel sur la touche ON OFF ...