Appendix, A: relationship output signal – pressure – INFICON HPG400 ATM to High-Vacuum Gauge User Manual
Page 45
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tina31e1 (2004-05) HPG400 v1.om
45
Appendix
over
range
1E+03
1E+02
1E+01
1E+00
0.0 0.5 1.0 1.5
2.5
3.5
4.5
5.5
6.5
7.5
8.5
9.5
2.0
3.0
4.0
5.0
6.0
7.0
9.0
1E–01
1E–02
1E–03
1E–04
1E–05
1E–06
8.0
10.2
10.0
Measuring signal U[V]
Pressure p [mbar]
Hot cathode range and Pirani range require different conversion formulae:
p = 10
U - c1
⇔
U = c1 + log p
p = 10
(4 × (U - c2))
⇔
U = c2 + 0.25 log p
Where
U
p
c1
c2
[V] [mbar]
7.5
9
[V] [Torr]
7.625
9.031
[V] [Micron]
4.625
8.281
[V] [Pa]
5.5
8.5
Switch position
<P
↔ HP>
Threshold
0 or 1
2 or 3
4 or 5
6 or 7
8 or 9
1 mbar (factory setting)
5×10
–1
mbar
2×10
–1
mbar
1×10
–1
mbar
5×10
–2
mbar
A:
Relationship Output
Signal – Pressure
Conversion curve
Conversion formula
hot cathode range
Conversion formula
Pirani range
Changeover threshold
hot cathode
↔ Pirani
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