32 5977 Series MSD 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 “To
Calibrate Column Flow Linear Velocity” on page 66 for instructions on how to
measure actual flow in your column. Use the Flow Calculation software and
Table 5 to determine whether a given column will give acceptable flow with
realistic head pressure.
Table 5 Gas flows
Model
Feature G7035A G7036A G7037A G7038A G7039A G7040A
High vacuum pump Diffusion Performance
turbo
Diffusion Performance
turbo
Performance
turbo
Performance
turbo
Optimal He column flow
mL/min
1 1 to 2 1 1 to 2 1 to 2 1 to 2
Maximum recommended gas
flow mL/min
*
1.5 4 1.5 4 4 4
Maximum gas flow, mL/min
†
2 6.5 2 6.5 6.5 6.5
Max column id 0.25 mm
(30 m)
0.53 mm
(30 m)
0.25 mm
(30 m)
0.53 mm
(30 m)
0.53 mm
(30 m)
0.53 mm
(30 m)
CI capability No No No No No Yes
GC compatibility 7820 7820 7890 Series 7890 Series 7890 Series 7890 Series
* Total gas flow into the MSD: column flow plus reagent gas flow (if applicable).
† Expect degradation of spectral performance and sensitivity.
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