RADWAG MAS 1. Y, User Manual

Page: 46 / 201

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Error value in relation to density of weighed sample
C
or
rec
ti
on v
al
ue
[m
g]
D
ens
it
y
o
f w
ei
g
hed
loa
d
The graph presents correction
values for versus the density of
weighed load, assumption that air
density is constant and equals
1.2 kg/m
3
is taken.
2. testing sample mass change within a few hours long period of time for a case when
the sample mass is relatively constant (minor changes). It is assumed that air density
changes affect considerably the final result, wherein the density is influenced by
changes of pressure, temperature and humidity.
In order to carry out a reliable measurement it is necessary to know the measuring methods,
features of tested sample, ambient conditions, air density in the laboratory room and density
of weighed sample.
FUNCTIONING
The air buoyancy compensation procedure is to be used as follows:
1. Method 1:
Enter air density value and value of weighed sample density to balance’s memory.
Wait, the software automatically calculates the correction factor for weighed mass,
next corrected value of weighed mass is displayed.
In order to avoid mistakes, the corrected mass value is accompanied by <
!
> symbol,
the symbol is visible on a display and a printout.
2. Method 2:
Determine air density value with use of module program (semi-automatic operation)
and enter value of weighed sample density to balance’s memory.
Determination of air density is carried out using a set of two mass standards, one
made of stainless steel, and the other one of aluminium. Based on mass indications of
the two standards, the software automatically calculates the air density and saves the
value in balance’s memory on operator’s confirmation. Now, enter value of weighed
sample density to balance’s memory.
Wait, the software automatically calculates the correction factor for weighed mass,
next corrected value of weighed mass is displayed.
The corrected mass value is accompanied by <
!
> symbol, the symbol is visible on a
display and a printout.
In order to enable/disable the air buoyancy compensation procedure go to the user menu.
The procedure is valid for weighing mode exclusively.