Calculation
2) 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/cm3 (e.g., 8.30000 g/cm3)
Formula
Input:: 2 + V (W/(/ + 100 + 8.3/1.000))
Header: d
Unit: mm
3) 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 “g!” |
|
W = weight value in grams |
K= correction factor
2.Definition: K = 1 – (RhoL / RhoST) / 1 – (RhoL / RhoG)
with: |
RhoL |
= air density in g/cm3, e.g., 0.0012 g/cm3 (standard air density) |
|
RhoST = density of steel, e.g., 8.0000 g/cm3 |
|
|
RhoG |
= density of sample, e.g., 2.4000 g/cm3 |
Preparation
Access an existing task, for example, via the “Change” item from the Task menu. The available tasks can be loaded from the SD card (in this case, the “TASK-AIR- BUOYANCY_CORR” file).
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 decimal places |
– |
Result unit: |
g! |
92 Cubis MSA User Manual
Calculation
Execute a Task: Calculation “Air Buoyancy Correction”
tIf you haven’t already done so, go to Task Management. y The task selection is displayed.
tTouch the “Air buoyancy correction” task from the Task menu. y The formula for the air buoyancy correction is already defined.
tEnter the density of the sample via “Variable X,” in this example 2.400 g/cm3.
tTouch Start to begin the calculation.
tThe mass is displayed as the calculation result.
tTo return to the weight value display, touch Weigh.
tYou can view both values, the weight and the mass.
tIf you want to carry out additional weighing and calculations using
the same formula, place the sample on the balance and then touch Calc.
tIf you want to carry out additional weighing using a different formula, touch Back.
tYou can now change the formula and then proceed as described above.
Print via the P key:
N+ 3.183629 g
X2.400
m + 3.184744 g!
Cubis MSA User Manual |
93 |
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Calculation
Execute Task: Calculation
Dt If you haven’t already done so, go to Application Management. y The task selection is displayed.
t Touch the desired task.
or
t If the desired task is already selected, touch Start.
t When you want to work with a variable formula, you can now enter or change the formula.
t Place the sample on the balance.
y The weight value is displayed.
t To start the calculation, touch Start.
y The calculation results are displayed.
t To return to the weight value display, touch Weigh.
tIf you want to carry out additional weighing and calculations using the same formula, place the sample on the balance and then touch Calc.
tIf you want to carry out additional weighing using a different formula touch
Back.
tYou can now change the formula and then proceed as described above.
94 Cubis MSA User Manual