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Table 2
Typical MSD pressure readings for various helium carrier gas flow rates
Diffusion pump MSD
Column flow (ml/min)
Turbo pump MSD
Column flow (ml/min)
If the pressure is consistently higher than those listed, refer to the online help in
the MSD ChemStation software for information on troubleshooting air leaks and
other vacuum problems.
If the pressure rises above approximately 8 × 10
will turn off the triode gauge tube. The gauge tube does not turn back on
automatically.
1.0
1.5
2.0
1.0
2.0
3.0
4.0
Triode gauge reading (Torr)
5.0 × 10
-
5
7.5 × 10
-
5
1.0 × 10
-
5
Triode gauge reading (Torr)
1.5 × 10
-
5
3.0 × 10
-
5
4.5 × 10
-
5
6.0 × 10
-
5
-3
Torr, the gauge controller
Operating the MSD
2
To monitor high vacuum pressure
Foreline gauge reading (Torr)
40
53
66
45
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