tina46e1-b (2017-12) BPG402.om
51
The gas type dependence in the pressure range <10
-3
mbar can be compensated
by means of the following formula (gauge adjusted for air):
p
eff
= C × indicated pressure
where
Gas type
Calibration factor C
Air,
O
2
, CO, N
2
1.0
N
2
1.0
He
5.9
Ne
4.1
H
2
2.4
Ar
0.8
Kr
0.5
Xe
0.4
(The above calibration factors are mean values.)
A mixture of gases and vapors is often involved. In this case, accurate
determination is only possible with a partial-pressure measuring instru-
ment.
