4Operating in EI Mode
102 5977B Series MSD Operating Manual
The largest influence on operating pressure in EI mode is the carrier gas
(column) flow. Table 9 lists typical pressures for various helium carrier gas
flows. These pressures are approximate and will vary from instrument to
instrument by as much as 30%.
Figure 31 Manual Tune Values tab HiVac reading
Table 9 Ion vacuum gauge reading
Column flow rate,
mL/min
Optional gauge
reading, Torr
Tur bo pump
Gauge reading, Torr
Diffusion pump
Foreline reading, mTorr
Diffusion pump
0.5 3.18E–06 2.18E–05 34.7
0.7 4.42E–06 2.59E–05 39.4
1 6.26E–06 3.66E–05 52.86
1.2 7.33E–06 4.46E–05 60.866
2 1.24E–05 7.33E–05 91.784
3 1.86E–05 1.13E–04 125.76
4 2.48E–05
6 3.75E–05
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