Technical Information
Ionization Gauge Instruction Manual - 274026 - Rev. B
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Gas Sensitivity
Table 4-3 lists relative gauge sensitivities (r
X
) for various gases. The values
listed are averages of several gauges and several references from literature
(Table II, Ionization Gauge Sensitivities As Reported in the Literature, from
NASA Technical Note TND5285 by Robert L. Summers, Lewis Research
Center, National Aeronautics and Space Administration). Refer to this
reference for further definition of these average values and for calculations
of the gauge sensitivities of other gases.
To convert ion gauge readout from nitrogen equivalent pressure, divide the
readout by the values listed for r
x
.
.
Table 4-3
Gas Sensitivity
Gas Type
Average Value of r
X
He
0.18
Ne
0.30
D
2
0.35
H
2
0.46
N
2
1.00
Air
1.00
O
2
1.01
CO
1.05
H
2
O
1.12
NO
1.16
Ar
1.29
CO
2
1.42
Kr
1.94
SF
6
2.50
Xe
2.87
Hg
3.64
