10
Appendix A – Atmospheric Pressure Correction Table
The flow value measured with the Palltronic Flow Check II unit is dependent on atmospheric pressure and is
given as a reference value normalized for an atmospheric pressure of 1000 mbar (absolute), using air. The unit
measures the actual atmospheric pressure which is influenced by the altitude and the actual atmospheric
conditions and displays a corrected “expected” value. Table 4 shows the influence of the atmospheric pressure
on the capillary flow value.
Table 4
Atmospheric Pressure Correction Values
(mbar)
Atmospheric Pressure
(kPa)
(psi)
Approx. Altitude
Above Sea Level
‘Expected Flow’
Deviation (%)
Correction
Factor
1070
1060
1050
1040
1030
1020
1010
1000
990
980
970
960
950
940
930
920
910
900
890
880
870
860
850
840
830
820
810
800
790
780
770
760
750
740
730
720
710
700
107.0
106.0
105.0
104.0
103.0
102.0
101.0
100.0
99.0
98.0
97.0
96.0
95.0
94.0
93.0
92.0
91.0
90.0
89.0
88.0
87.0
86.0
85.0
84.0
83.0
82.0
81.0
80.0
79.0
78.0
77.0
76.0
75.0
74.0
73.0
72.0
71.0
70.0
15.52
15.37
15.23
15.08
14.94
14.79
14.65
14.50
14.36
14.21
14.07
13.92
13.78
13.63
13.49
13.34
13.20
13.05
12.91
12.76
12.62
12.47
12.33
12.18
12.04
11.89
11.75
11.60
11.46
11.31
11.17
11.02
10.88
10.73
10.59
10.44
10.30
10.15
+3.5
+3.0
+2.5
+2.0
+1.5
+1.0
+0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
-5.5
-6.0
-6.5
-7.0
-7.5
-8.0
-8.5
-9.0
-9.5
-10.0
-10.5
-11.0
-11.5
-12.0
-12.5
-13.0
-13.5
-14.0
-14.5
-15.0
1.035
1.030
1.025
1.020
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
0.975
0.970
0.965
0.960
0.955
0.950
0.945
0.940
0.935
0.930
0.925
0.920
0.915
0.910
0.905
0.900
0.895
0.890
0.885
0.880
0.875
0.870
0.865
0.860
0.855
0.850
0 m
250 m
500 m
750 m
1000 m
1250 m
1500 m
1750 m
2000 m
2250 m
2500 m
2750 m
3000 m
0 ft
750 ft
1500 ft
2250 ft
3000 ft
3750 ft
4500 ft
5250 ft
6000 ft
6750 ft
7500 ft
8250 ft
9000 ft
9750 ft
