Free Space; Measured - Micromeritics ASAP 2460 Operator's Manual

Appendix C

Free Space

Measured

Measured free-space volumes are calculated using the following equations:
V
man
----------- -
V =
fw
T
man
V = V
fc fw
V
--------------------- -
V =
bath
1
where:
P =
1
P =
2
P =
3
T =
amb
T =
bath
T =
man
T =
STD
V =
bath
V =
fc
V =
fw
V =
man
C-4
P
  T
1
----- - 1 –
 
STD
P
2
P
 
2
----- -
 
P
3
– V
fc fw
T
bath
----------- -
–
T
amb
system manifold pressure before dosing helium onto sample
system manifold pressure after dosing helium onto sample
sample pressure after raising dewar and equilibrating with helium
approximate room temperature (298 K)
analysis bath temperature (K)
system manifold temperature before dosing helium onto sample (K)
standard temperature (273.15 K)
portion of cold free space at analysis bath temperature
volume of free space, cold (cm
volume of free space, warm (cm
manifold volume (cm
3
at standard temperature)
3
at standard temperature)
3
)
ASAP 2460 Operator's Manual
246-42800-01 - Aug 2013