The Possible Vacuum Attained is based on your Altitude. Basically, The higher you are, the less vacuum you can attain. Current Atmospheric Pressure x Max. Rated Level of a Vacuum 30″ Hg = absolute vacuum It is important to consider the relationship between atmospheric pressure and altitude as it affects vacuum pump performance. Because free air is less dense at higher altitudes (i.e. lower atmospheric pressure) operation at these higher altitudes has the effect of reducing the capacity and maximum vacuum levels attainable. In general flow is not affected, just the maximum vacuum level attainable. Refer to the following table for correct¬†vacuum pump performance at various altitudes.

Vacuum Gauge Reading When Read at Altitude

Altitude Above Sea Level (feet)

Altitude Above Sea Level (meters)

Atmospheric Pressure (psi)

Maximum Vacuum Level Attainable (inches Hg)

Vacuum Level Loss at Altitude

Maximum Vacuum Level Possible at this Altitude

0

0

14.70

29.921

1000

305

14.16

28.9

3.4%

96.6%

2000

610

13.66

27.8

7.1%

92.9%

3000

914

13.16

26.8

10.4%

89.6%

4000

1219

12.68

25.8

13.8%

86.2%

5000

1524

12.22

24.9

16.8%

83.2%

6000

1829

11.77

24.0

19.8%

80.2%

7000

2134

11.33

23.1

22.8%

77.2%

8000

2438

10.91

22.2

25.9%

74.1%

9000

2743

10.50

21.4

28.6%

71.4%

10,000

3048

10.10

20.6

31.3%

68.7%

11,000

3353

9.71

19.8

33.9%

66.1%

12,000

3658

9.34

19.0

36.5%

63.5%

13,000

3962

8.97

18.3

39.0%

61.0%

14,000

4267

8.62

17.5

41.4%

58.6%

15,000

4752

8.28

16.9

43.6%

56.4%

Conversion Chart

Pg-psig

Pa-psia

In. Hg

-mbar

Torr

-mm Hg

% Vacuum

0.00

14.70

0

0.00

760.0

0.0

0.0

0.49

14.24

1

33.86

734.6

25.4

3.3

0.98

13.75

2

67.72

709.2

50.8

6.6

1.47

13.26

3

101.58

683.8

76.2

9.9

1.96

12.76

4

135.44

658.4

101.6

13.2

2.45

12.27

5

169.30

633.0

127.0

16.5

2.95

11.78

6

203.16

607.6

152.4

19.8

3.44

11.29

7

237.02

582.2

177.8

23.1

3.93

10.80

8

270.88

556.8

203.2

26.4

4.42

10.31

9

304.74

531.4

228.6

29.7

4.91

9.82

10

338.60

506.0

254.0

33.0

5.40

9.33

11

372.46

480.6

279.4

36.3

5.89

8.84

12

406.32

455.2

304.8

39.6

6.38

8.35

13

440.18

429.8

330.2

42.9

6.87

7.86

14

474.04

404.4

355.6

46.2

7.36

7.36

15

507.90

379.0

381.0

49.5

7.86

6.87

16

541.76

353.6

406.4

52.8

8.35

6.38

17

575.62

328.2

431.8

56.1

8.84

5.89

18

609.48

302.8

457.2

59.4

9.33

5.40

19

643.34

277.4

482.6

62.7

9.82

4.91

20

677.20

252.0

508.0

66.0

10.31

4.42

21

711.06

226.6

533.4

69.3

10.80

3.93

22

744.92

201.2

558.8

72.6

11.29

3.44

23

778.78

175.8

584.2

75.9

11.78

2.95

24

812.64

150.4

609.6

79.2

12.27

2.45

25

846.50

125.0

635.0

82.5

12.76

1.96

26

880.36

99.6

660.4

85.8

13.26

1.47

27

914.22

74.2

685.8

89.1

13.75

0.98

28

948.08

48.8

711.2

92.4

14.24

0.49

29

981.94

23.4

736.6

95.7

14.70

0.00

29.92

1013.00

0.0

760.0

100.0

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