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Gas Correction Factors

Gas correction factor tables are are only reproduced for the convenience of the user and do not imply that use with other gases will be safe with BA ion gauges.

Divide sensitivity by 100 for Pa-1; multiply by 1.33 for Torr-1.

Gas

Symbol

Gas Correction Factor

NGC

Sensitivity S, mBar-1

Acetone

(CH3)2CO

3.6

68

Air

---

1.0

19

Ammonia

NH3

1.3

25

Argon

Ar

1.3

24

Benzene

C6H6

5.9

112

Bromine

Br

3.8

72

Bromomethane

CH3Br

3.7

70

Cadmium

Cd

2.3

44

Carbon Dioxide

CO2

1.4

27

Carbon Disulfide

CS2

5.0

95

Carbon Monoxide

CO

1.05

20

Carbon Tetrachloride

CCl4

6.0

114

Cesium

Cs

4.3

82

Chlorine

CI2

0.68

13

Chlorobenzene

C6H5CI

7.0

133

Chloroethane

C2H5CI

4.0

76

Chloroform

CHCI3

4.7

89

Chloromethane

CH3CI

2.6

49

Cyanogen

(CN)2

2.8

53

Cyclohexylene

C6H12

7.9

150

Deuterium

D2

0.35

7

Dichlorodifloromethane

CCI2F2

2.7

51

Dichloromethane

CH2CI2

3.7

70

Ethane

C2H6

2.6

49

Ethanol

C2H5OH

3.6

68

Ethyl Acetate

CH3COOC2H5

5.0

95

Ethyl ether

(C2H5)2O

5.1

97

Ethylene

C2H4

2.3

44

Ethylene oxide

(CH2)2O

2.5

47

Helium

He

0.18

3

Heptane

C7H16

8.6

163

Hexane

C6H14

6.6


125

Hydrogen

H2

0.46

9

Hydrogen Bromide

HBr

2.0

38

Hydrogen Chloride

HCl

1.5

28

Hydrogen Cyanide

HCN

1.5

28

Hydrogen Fluoride

HF

1.4

27

Hydrogen Iodide

HI

3.1

59

Hydrogen Sulfide

H2S

2.2

42

Iodine

I2

5.4

103

Iodomethane

CH3I

4.2

80

Isoamyl Alcohol

C5H11OH

2.9

55

Isobutylene

C4H8

3.6

68

Krypton

Kr

1.9

36

Lithium

Li

1.9

36

Mercury

Hg

3.6

68

Methane

CH4

1.4

27

Methanol

CH3OH

1.8

34

Methtyl Acetate

CH3COOCH3

4.0

76

Mythyl ether

(CH3)2O

3.0

57

Naphthalene

C10H8

9.7

184

Neon

Ne

0.3

6

Nitrobenzene

C6H5NO2

7.2

137

Nitric Oxide

NO

1.3

25

Nitrogen

N2

1.0

19

Nitrogen Oxide

NO2

1.2

23

Nitrous Oxide

N2O

1.5

28

Oxygen

O2

1.0

19

Phosphine

PH3

2.6

49

Potassium

K

3.6

68

Propane

C3H8

4.2

80

Rubidium

Rb

4.3

82

Sodium

Na

3.0

57

Sulphur Dioxide

SO2

2.1

40

Sulphur Hexafluoride

SF6

2.3

44

Toluene

C6H5CH3

6.8

129

Water

H2O

1.1

21

Xenon

Xe

2.9

55