Rice Lake Ohaus Explorer Pro High Capacity Instuction Manual - Manual (Page 36)

EN-32 Explorer Pro
The density Q is the quotient of the mass m and the volume V.
Density determinations are performed by using Archimedes’
principle.
. . . . This principle states that every solid body immersed
in a fluid loses weight by an amount equal to that of the fluid it
displaces. The density table for water is included in the
Explorer balance software.
The density of a solid is determined with the aid of a liquid
whose density, Qo, is known (water is used as an auxiliary
liquid). The solid is weighed in air (((((A)
) ) ) ) and then in the auxiliary
liquid ( B). The density Q can be calculated from the two
weighings as follows:
Q = Density of the solid
A = Weight of the solid in air
B = Weight of the solid in the auxiliary liquid
Q
0
= Density of the auxiliary liquid at a given tempera-
ture (this value depends on the temperature). The
density table for water is included in Explorer balances.
P = Buoyancy of the solid in the auxiliary liquid (corre-
sponds to
A -B).
In the event that a different liquid is to be used, provi-
sions are made to enter the density of the desired
liquid and enter its name into a library. The following
procedure uses water.
Q = m
V
Q =
A
A -B
• Q
0
Q =
A
P
• Q
0
The balance allows direct determination of the buoyancy
P
(P =A - B ) and consequently the above formula can be
simplified:
DENSITY 01/01/03 03:05:45 PM
TEMP SETUP START
0g 6100g
*
Temp: 25.0 Air: 0.00 g
Aux D: 0.9971 Liquid: 0.00 g
Volume: 0.00 g
0.00
g
Before using the Density feature, the Density Setup should be
reviewed. Highlight the SETUP soft key and press the Enter
button. Assign a Library Name.
NOTE: All Density settings made with a Library Name will be
directly associated with the Library name. When a Library Name
is called up, all settings will be retained with the Library Name.
Review the settings and change as necessary.
DENSITY SETUP
Library Name : DENSITY
Mode : Solid
Auxiliary Liquid : H2O
Auxiliary Density : 0.9971
Temperature (C) : 25.00
Porous Material : Off
Auto Sample : Off
Auto Print : Off
Display Settings : Default
Exit
Solid Density Determinations for items More Dense Than
Water