Calculations; Saturation Pressure - Micromeritics TriStar II 3020 Operator's Manual

TriStar II 3020
This appendix contains the calculations used in the analysis program.

Saturation Pressure

Saturation pressure (Po) is selected on the Po and Temperature Options dialog. It may be entered or
measured in the Po tube or on port 3.
• If entered, Po = user-entered value
• If measured, Po = equilibrated pressure reading after saturating Po tube or the sample tube
Relative Pressure Calculations
If Po was measured at intervals in the Po tube and several data points were collected in the interval:
• For points taken before the previous Po measurement,
=
Po Po
1
I
• For points taken after the previous Po, use the previous Po:
Po = Po
I 1
If Po was entered, use the entered Po:
Po = Po
I E
Calculate relative pressure for the I
P
1
--------
=
P
rel
Po
1
I
where
Po =
I
Po =
1
Po =
2
Po =
C
Po =
E
t =
I
to =
1
to =
2
302-42828-01 - Dec 2012
C. CALCULATIONS
    
– –
Po Po t to
2 1 1
I
--------------------------------------------------------- -
+
 
–
to to
2 1
th
data point:
saturation pressure for the I
most previous measured saturation pressure before I
first measured saturation pressure after the I
calculated Po
entered saturation pressure (mmHg)
th
time when the I data point was taken (minutes)
time when Po was measured (minutes)
1
time when Po was measured (minutes)
2
th
data point (mmHg)
th
data point (mmHg)
Appendix C
th
data point (mmHg)
C-1