64
14. Appendix 2: Pressure vs. Altitude table
Barometric pressure affects DO readings, therefore this meter lets you enter the cor-
rect barometric pressure at your altitude. If you do not have equipment that lets you
measure the exact barometric pressure at your altitude, you can estimate it using the
chart below.
If you change the barometric pressure setting from its factory setting (760 mm Hg),
the % saturation calibration value in air will automatically adjust to a value other
than 100% (see “corrected % saturation value” column below). The adjusted value is
correct for the new barometric pressure setting.
See page 39 or 47 for information on how to adjust the barometric pressure.
Pressure vs Altitude
Altitude (ft)
Pressure (mm Hg)
Corrected % saturation value
0 (Sea level)
760
100
500
746
98.1
1000
732
96.3
1500
720
94.7
2000
707
93.0
2500
694
91.3
3000
681
89.6
3500
668
87.8
4000
656
86.2
4500
644
84.6
5000
632
83.0
5500
621
81.6
6000
609
80.0