Micromeritics ASAP 2460 User Manual

ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-7
Thermal Transpiration Correction
During data reduction, thermal transpiration correction is applied to the data if the user selected Apply
thermal transpiration correction from the Report Options window. Starting with the first collected
pressure, the following calculations are performed until the pressure ratio (PC/P) is greater than or
equal to 0.99.
where:
 = Weber’s coefficient, 0.033
 = Weber’s coefficient, 0.245
F,Y, = intermediate values for subsequent calculations
G = Weber’s coefficient, 2.5
H = Weber’s coefficient, 2
MD = thermal transpiration hard sphere diameter of gas (Å), from the Adsorptive
Properties window
P = equilibrated collected pressure measured by gauge at temp T
amb
SD = inside diameter of sample tube (mm), from the Report Options window
T = average temperature
T
amb
= room temperature (298 K)
T
bath
= analysis bath temperature (K), from the Po and Temperature Options
window
Y
PSDMD
2

2.33 T
------------------------------------


10
3
=

1 G Y+
1 H Y+
-----------------------
=
F
1
Y
2
Y ++
---------------------------------
=
P 1 F 1
T
bath
T
amb
------------



–



–



=
T
bath
T+
2
--------------------

Micromeritics ASAP 2460 Specifications

General

Brand	Micromeritics
Model	ASAP 2460
Category	Measuring Instruments
Language	English