Columns - Agilent Technologies G7035A Operation Manual

2
Installing 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 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 Gas flows
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
GC compatibility
* Total gas flow into the MSD: column flow plus reagent gas flow (if applicable).
† Expect degradation of spectral performance and sensitivity.
32
to determine whether a given column will give acceptable flow with
G7035A G7036A
Diffusion Performance
turbo
1 1 to 2
1.5 4
†
2 6.5
0.25 mm 0.53 mm
(30 m) (30 m)
No No
7820 7820
on page 66 for instructions on how to
Model
G7037A G7038A
Diffusion Performance
turbo
1 1 to 2
1.5 4
2 6.5
0.25 mm 0.53 mm
(30 m) (30 m)
No No
7890 Series 7890 Series
5977 Series MSD Operation Manual
"To
G7039A G7040A
Performance Performance
turbo turbo
1 to 2 1 to 2
4 4
6.5 6.5
0.53 mm 0.53 mm
(30 m) (30 m)
No Yes
7890 Series 7890 Series