Installing 7890 Gc Columns; Columns - Agilent Technologies 5977B Series Operating Manual

2

Installing 7890 GC Columns

Columns

Many types of GC columns can be used with the MSD, but there are some
restrictions.
During tuning or data acquisition, the rate of column flow into the MSD should
not exceed the maximum recommended flow. Therefore, there are limits to
column length, diameter, and flow. Exceeding recommended flow results in
degradation of mass spectral and sensitivity performance.
Remember that column flows vary greatly with oven temperature. (See
Calibrate Column Flow Linear Velocity"
measure actual flow in your column.) Use the Flow Calculation software and
Table 5
realistic head pressure.
Table 5
Feature
High vacuum pump
Optimal He column flow mL/min
Maximum recommended gas flow mL/min
Maximum gas flow, mL/min
Max column id
CI capability
CI reagent flows, mL/min
JetClean option H
* Total gas flow into the MSD: column flow plus reagent gas flow (if applicable) plus JetClean H
† Expect degradation of spectral performance and sensitivity.
36
to determine whether a given column will give acceptable flow with
Gas flows
†
flow
2
(if applicable). Based on helium gas use. For other gases the maximum flow will vary.
on page 52 for instructions on how to
Diffusion
1
*
1.5
2
0.53 mm
(30 m)
No
NA
NA
5977B Series MSD Operating Manual

"To
Gas flows
Turbo
1 to 2
4
6.5
0.53 mm
(30 m)
Yes
1 to 2
0.4 mL/min
2
flow