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Density Calculation
Basic Density Calculation
Thermo Scientific
DensityPRO User Manual
C-3
Standardization
Term
The standardization term is the average radiation intensity in counts per second over a
period of time. This value should be measured with a repeatable point in the process.
An example of a repeatable point in the process is an empty pipe or a pipe full of a
material with a known density. The standardization term can be used to correct for
buildup in the pipe or pipe wear.
To include the standardization term in the basic density calculation, the radiation
intensity (I), background intensity (Ibkg), and calibration intensity (Ical) are divided
by the standardization intensity (Istd).
This results in the following equation.
In
1
1
Equation 2
Slope Correction
Factor
To improve the accuracy of the density calculation, the slope correction factor (S) is
included in the density calculation. The slope correction factor is calculated when the
second calibration point is complete. To obtain the information for the second
calibration point, the user must enter the second calibration density and the gauge
must measure the radiation intensity for the second calibration density.
The user has the option to edit the slope correction factor. Additionally, if any of the
terms used to calculate the slope correction factor are modified after calibrating the
second calibration point, the slop correction factor can be recalculated.
The following equation is used to calculate the slope correction.
In
2
1
∗
1
2
Equation 3
General Density
Calculation
The following is the equation to calculate density including slope correction factor.
Equation 4
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