Effects of Atmospheric Pressure
At lower atmospheric pressures, such as those found in high altitudes, the
concentration of alcohol in vapour can be affected.
It is important to note that sensitivity of the
AlcoVUE
®
instrument to alcohol is
NOT affected, only the concentration of alcohol in the vapour.
In light of this, suitable corrections should be performed to compensate for this
when calibrating in areas of reduced atmospheric pressure.
APPENDIX A.
Elevation from Sea Level (Ft.)
Correction Factor
0
1.0
500
0.981
1000
0.962
1500
0.943
2000
0.925
2500
0.907
3000
0.889
3500
0.872
4000
0.854
4500
0.837
5000
0.820
5500
0.804
6000
0.787
6500
0.771
7000
0.755
7500
0.740
8000
0.724
Example: test conducted at 500 (ft)
An
AlcoVUE
®
test result of 0.100%BAC conducted at an elevation height of 500ft. above sea
level would have a Correction Factor (multiplier) of 0.981.
i.e. 0.100%BAC x 0.981 = 0.0981%BAC
AlcoVUE® USER HANDBOOK
Revision 1.4
February 2018
14
