Sample calculation – VICI 120 Dynacalibrator User Manual
Page 8
Calculating the Concentration
The following flow correction factor table can be used if the elevation is
known. Find the elevation and temperature of your operational environment
on this table and multiply this factor to the published calibrated flow. The
calibrated flow is included in the certification documents shipped with the
instrument.
Temperature (°C)
Elevation
0
5
10
15
20
25
30
35
40
-1000'
1.064
1.054
1.045
1.036
1.027
1.018
1.010
1.002
0.994
sea level
1.045
1.035
1.026
1.017
1.009
1.000
0.992
0.984
0.976
1000'
1.026
1.017
1.008
0.999
0.990
0.982
0.974
0.966
0.958
2000'
1.007
0.998
0.989
0.981
0.972
0.964
0.956
0.948
0.941
3000'
0.989
0.980
0.971
0.963
0.955
0.947
0.939
0.931
0.924
4000'
0.971
0.962
0.954
0.945
0.937
0.929
0.922
0.914
0.907
5000'
0.953
0.944
0.936
0.928
0.920
0.912
0.905
0.897
0.890
Figure 3: Flow correction factor table
Sample Calculation
Given:
Permeation rate: 21,000 ng/min Cl
2
@ 30°C
Flow: 1100 cc/min (from Flowmeter Table
Ambient temperature: 15°C
Ambient pressure: (unknown), elevation = 2000
'
Correct the flow per table above:
F = (0.981)(1100) = 1079 cc/min
Then:
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For zero reference measurement, remove the permeation device from the
chamber.