Typical Vacuum Pressures In Ei Mode - Agilent Technologies 7200 Operation Manual

3
Operating in Electron Impact (EI) Mode

Typical Vacuum Pressures in EI Mode

The largest influences on operating pressure in EI mode are the carrier gas
(column) and collision cell gas flows.
helium and nitrogen collision cell gas flows. These pressures are approximate
and will vary from instrument to instrument by as much as 30%.
Table 3 Influence of carrier and collision cell gas flows on vacuum
Column Flow
(mL/min) Rough Vac
0.5 1.16 * 10
0.7 1.18 * 10
1 1.22 * 10
1.2 1.24 * 10
2 1.32 * 10
3 1.42 * 10
4 1.50 * 10
If the pressure is consistently higher than those listed, refer to the online help
in the MassHunter Workstation software for information on troubleshooting
air leaks and other vacuum problems.
40
CC Gas On
N2 = 1.5 mL/min
Quad Vac
-1 -5
3.41 * 10
-1 -5
3.41 * 10
-1 -5
3.43 * 10
-1 -5
3.43 * 10
-1 -5
3.44 * 10
-1 -5
3.44 * 10
-1 -5
3.46 * 10
Table 3
TOF Vac Rough Vac
-7
4.20* 10 8.29 * 10
-7
4.20 * 10 8.67 * 10
-7
4.22 * 10 9.17 * 10
-7
4.22 * 10 9.49 * 10
-7
4.22 * 10 1.07 * 10
-7
4.25 * 10 1.19 * 10
-7
4.27 * 10 1.29 * 10
7200 Accurate-Mass QTOF Operation Manual
lists typical pressures for various
CC Gas Off
Quad Vac
-2 -7
3.17 * 10
-2 -7
3.45 * 10
-2 -7
3.79 * 10
-2 -7
4.06 * 10
-1 -7
5.17 * 10
-1 -7
6.51 * 10
-1 -7
7.84 * 10
TOF Vac
-7
2.15 * 10
-7
2.15 * 10
-7
2.16 * 10
-7
2.16 * 10
-7
2.17 * 10
-7
2.20 * 10
-7
2.21 * 10