Performing The Density Determination Of Solids - Mettler Toledo Excellence XP Bedienungsanleitung

Density determination kit for Excellence XP/XS precision balances
8
4.2

Performing the density determination of solids

Note: These instructions explain how to work with the density determination kit. They describe the procedure
for performing a density determination manually.
If you need information about operating your balance, please refer to the Operating Instructions which you
received with the balance. The Operating Instructions include instructions for working with the density
determination software which is built into the
For the density determination of solids, use the low glass beaker (7) and one of the two holders for solids
which sink (9) or float (10).
balance.
Prepare the balance for the density determination (install platform,
bracket and pan) as described in Section 2.
Suspend the supplied thermometer (11) from the edge of the low
beaker (7). Place the beaker on the pan and fill it with auxiliary
liquid (liquid of known density ρ
ethanol). Add enough liquid to ensure that the solid is covered by
at least 1 cm liquid after immersion.
Suspend the suitable holder (9) or (10) for solids which sink or
float from the bracket (the adjacent illustration shows the holder for
solids which sink).
Ensure that no air bubbles adhere to the immersed part of the
holder (remove any air bubbles by moving the holder or by means
of a fine brush).
Close the draft shield doors and tare the balance.
Place the solid in one of the two weighing pans of the bracket (5).
Wait until the weight display of the balance is stable (stability
detector fades) and note the displayed weight A (weight of sample
in air).
Note for 0.1 mg models
When solids with a weight greater than 20 g are weighed in air,
place in the pan at the top of the holder (above 20 g cornerload
errors may appear on one arm in the weighing).
, usually distilled water or
0