INFICON BPG402-Sx ATM to Ultra-High Vacuum Gauge - Manual (Page 49)

tina46e1-a (2010-03) BPG402.om
49
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.
Calibration in pressure range
<10
-3
mbar