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