Troubleshooting - Sartorius YDK01 Betriebsanleitung

Troubleshooting

The formula on the previous page
for determining the specific gravity of
solids is sufficient to obtain an accuracy
of one to two decimal places.
Depending on the accuracy you require,
consider the following error and
allowance factors.
– The density of the liquid causing
buoyancy depends on its temperature
– Air buoyancy during weighing in air
– The change in the immersion level
of the pan hanger assembly when the
sample is immersed
– Adhesion of the liquid on the suspension
wire of the pan hanger assembly
– Air bubbles on the sample
Some of these errors can be corrected
by calculation. To do so, proceed as
follows:
– measure the temperature of the
reference liquid and correct its density
accordingly
and
– define the inner diameter of the
container which holds the reference
liquid.
14
Dependence of the Liquid Density on
Temperature
The density of the liquid causing
buoyancy depends on the temperature.
The change in the density per °C
change in temperature is in the range of
– 0.02% for distilled water
– 0.1% for alcohols and hydrocarbons.
In other words, this can show up in
the third decimal place during specific
gravity/density determination.