ASAP 2460 Operator’s Manual
Appendix C
246-42800-01 - Aug 2013
C-1
C. CALCULATIONS
This appendix contains the calculations used in the analysis program.
Saturation Pressure
Saturation pressure (Po) is selected on the
Po and Temperature Options
window. It may be entered
or measured in the Po tube. The software uses the following methods to get Po:
1.
Po is measured in the Po tube for each isotherm point.
2.
The saturation pressure is measured in the sample tube after all adsorption data points have been
collected. This pressure is used as Po for all data points.
3.
Po is measured for all points as with #1. After all adsorption points have been taken Po is
measured in the sample tube. The measured Po points are shifted so that the Po measured in the
Po tube matches the Po measured in the sample tube. That is,
Po
i
=
Po
i
+
Po
s
-
Po
n
where
Po
n
is
the Po measured in the Po tube when Po in the sample tube (
Po
s
) was measured.
4.
Determine Po from pressure measured over the dosing source. Note that the Adsorptive
Properties must specify dosing from Psat tube, Sample port 3, or Vapor source.
5.
The saturation pressure of a gas is measured in the Po tube for each data point. The bath
temperature is found by looking up the temperature for the measured saturation pressure in the
fluid properties. Po of the analysis gas is found from the bath temperature as in #6. If dosing is
done from the Psat tube, Po is determined once at the beginning of the analysis and used for all
data points. Otherwise, Po is measured for each data point.
6.
Po is found by looking up the saturation pressure for the entered bath temperature in the fluid
property information.
Lookup of saturation pressure in the fluid properties is done by interpolating the Psat data using
the Clausius-Clapeyron equation,
. The constants
a
and
b
are determined from
the pressures and temperatures that bound the bath temperature. Temperature lookup is done by
solving for
T,
, where
a
and
b
are determined from the pressures that bound the
given saturation pressure.
7.
If entered, Po = user-entered value.
P
ln
a
T
---
b
+
=
T
a
P
b
–
ln
------------------------
=
Содержание ASAP 2460
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Страница 12: ...Table of Contents ASAP 2460 Operator s Manual viii 246 42800 01 Nov 2013...
Страница 30: ...Using the Software ASAP 2460 Operator s Manual 1 18 246 42800 01 Aug 2013...
Страница 93: ...ASAP 2460 Operator s Manual Generating Graph Overlays 246 42800 01 Aug 2013 2 63...
Страница 94: ...Generating Graph Overlays ASAP 2460 Operator s Manual 2 64 246 42800 01 Aug 2013...
Страница 202: ...Service Test ASAP 2460 Operator s Manual 4 36 246 42800 01 Aug 2013...
Страница 230: ...Report Examples 2460 Operator s Manual 5 28 246 42800 01 Aug 2013 Isotherm Linear Plot...
Страница 231: ...2460 Operator s Manual Report Examples 246 42800 01 Aug 2013 5 29 BET Surface Area Report...
Страница 232: ...Report Examples 2460 Operator s Manual 5 30 246 42800 01 Aug 2013 BET Surface Area Plot...
Страница 233: ...2460 Operator s Manual Report Examples 246 42800 01 Aug 2013 5 31 t Plot Report...
Страница 234: ...Report Examples 2460 Operator s Manual 5 32 246 42800 01 Aug 2013 BJH Adsorption Cumulative Pore Volume...
Страница 235: ...2460 Operator s Manual Report Examples 246 42800 01 Aug 2013 5 33 BJH Desorption Cumulative Pore Volume...
Страница 236: ...Report Examples 2460 Operator s Manual 5 34 246 42800 01 Aug 2013...
Страница 242: ...Service Test Mode 2460 Operator s Manual 6 6 246 42800 01 Aug 2013...
Страница 270: ...Calibrating the System ASAP 2460 Operator s Manual 7 28 246 42800 01 Aug 2013...
Страница 276: ...Ordering Information ASAP 2460 Operator s Manual 8 6 246 42800 01 Aug 2013...
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Страница 374: ...Appendix C ASAP 2460 Operator s Manual C 50 246 42800 01 Aug 2013...
Страница 398: ...Appendix F ASAP 2460 Operator s Manual F 18 246 42800 01 Aug 2013...
Страница 412: ...Index ASAP 2460 Operator s Manual Index 8 246 42800 01 Aug 2013...
Страница 413: ...ASAP 2460 Operator s Manual Appendix G Aug 2013 SVP 1 SVP Smart VacPrep Operator Manual...
Страница 414: ...Appendix G ASAP 2460 Operator s Manual SVP 2 Aug 2013...
Страница 415: ...OPERATOR MANUAL Smart VacPrep Operator Manual Nov 2013 SMART VACPREP INTELLIGENT VACUUM SAMPLE PREPARATION SYSTEM...
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Страница 432: ...2 About the Software 2 4 Smart VacPrep Operator Manual...
Страница 466: ...8 Error Messages 8 4 Smart VacPrep Operator Manual...