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Appendix B: Altitude Compensation
The TAV® system’s flow output can vary if the system is used in locations that are significantly
above or below sea level. The following table allows you to estimate the amount of change in
the flow. Depending on the altitude of your location, the actual flow rate will be increased or
decreased by the indicated percentage.
Approximate Error in Delivered O2
Altitude
(feet)
Pressure
(mbar)
Pulse Mode
Tidal Assist
Mode
Constant Mode
-2000 1088 3% 1% 5%
0 1013 0% 0% 1%
500 995 0% 0% 0%
1000 977 -1% -1% -1%
2000 942 -2% -1% -3%
4000 874 -5% -3% -6%
6000 810 -7% -4% -10%
8000 751 -10% -6% -13%
10000 695 -12% -7% -16%
12000 643 -15% -8% -20%
14000 595 -18% -10% -23%
Examples:
1. The flow setting on your TAV® device is set at 3 lpm and the altitude is 4,000 ft.
Find 4,000 feet on the table:
º
Pulse Mode change = 5% (Volumes will be about 5% lower compared with sea
level)
º
Tidal Assist Mode change = 3% (Volumes will be about 3% lower compared with
sea level)
º
Constant Mode change = 6% (Flows will be about 6% lower compared with sea
level)
2. The flow setting on your TAV® device is set at 4 lpm and the altitude is 7,000 ft.
Average the 6,000 and 8,000 foot entries in the table:
º
Pulse Mode change = -8.5%
º
Tidal Assist Mode change = 5%
º
Constant Mode change = -11.5%