Sartorius ME215 Operating Instructions Manual page 96

Factory Settings of the Parameters
Off
Air density determination:
Change steel/aluminum references:
Soft Key Functions
Diff. Display the difference
between the value measured
and the specification for
steel/aluminum
Resul Toggle to the display page
for results
Fact.
Display the correction factor K
in the text line (see "Equations
for Air Buoyancy Correction"
on this page)
Corr.
Start air buoyancy correction
with numeric input of the
density of a sample
Net
Display the current value
measured
Param. Toggle to the display of the
current parameters for air
buoyancy correction (air
density, specifications for
steel, aluminum, etc.)
Ref. Toggle to the display and,
if necessary, input the air
density references (specifica-
tions and density for steel and
aluminum)
RhoW Input the density of a sample
using the numeric keys (in the
weighing mode)
RhoA
Activate air density determina-
RhoA
tion or display
seconds in the text line if
the parameter "Air density
determination Off" is set
Start
Start air buoyancy correction
and air density determination
using the density saved for
a specific sample
Sto Store (save) the steel/
aluminum reference values
Weigh Toggle to the weighing mode
without correcting the air
buoyancy
96
Air Buoyancy Correction
Diagram for Air Buoyancy Correction
Off
Correction
of the mass ∆m
(milligrams)
Equations for Air Buoyancy Correction
To determine the mass of a sample, its weight is multiplied by the following factor K:
for 2
K = (1 – Rho / Rho
A
where:
Rho = air density [kg/m
A
Rho = density of steel (8,000 kg/m
ST
Rho = density of the sample [kg/m
W
g
ρ
= 0.0012 — —– (air)
w
cm 3
) / (1 – Rho / Rho )
ST A W
3
]
3
)
3
]
g
ρ
= 0.8 ——–
w
cm 3
g
ρ
= 1.0 — —–
w
cm 3
g
ρ
= 1.4 — —–
w
cm 3
g
ρ
= 2.0 — —–
w
3
cm
g
ρ
= 4.0 — —–
w
cm 3
g
ρ
= 8.0 — —–
w
cm 3
g
ρ
= 22.5 — —–
w
cm 3
Weight displayed
on the balance (grams)