88 Cubis MSA User Manual
Calculation
Examples of Calculation Formulas
1) Diameter determination for cylindrical bodies
Definition: Diameter = 2
V (W / (/
l
Rho))
with: V = Square root
W = weight value in g
/ = 3.145
l = length of sample in cm
Rho = density of sample in g/cm
3
(e.g. 8.30000 g/cm
3
)
Formula
Input:: 2
V (W/(/
100
8.3/1,000))
Header: d
Unit: mm
2) Air buoyancy correction
Purpose
This application can correct weighing errors that can arise due to air buoyancy
when working with weights of different densities.
The air density value is required when calculating the air buoyancy correction.
Formulas and abbreviations
1. Definition: m = W * K
with: m = mass of the sample, unit symbol “I”
W = weight value in grams
K = correction factor
2. Definition: K = 1 – (RhoL / RhoST) / 1 – (RhoL / RhoG)
with: RhoL =
air density in g/cm
3
, e.g. 0.0012 g/cm
3
(standard air density)
RhoST = density of steel, e.g. 8.0000 g/cm
3
RhoG = density of sample, e.g. 2.4000 g/cm
3
Preparation
Access the “Change” item from the Task menu and select the
“TASK-AIR-BUOYANCY_CORR:” task downloaded to the SD card.
The “Calculation” application is set with the following parameters:
– Formula specifications: fixed
– Formula: W
( ( 1 - ( 0.0012 / 8.000 ) ) / ( 1 - ( 0.0012 / X ) ) )
– Result identifier: m
– Number of
decimal places: 6 digits
– Result unit: g!
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