Agilent Technologies 5977B Series Operating Manual page 102

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