32 5975 Series MSD Operation Manual for MassHunter
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 will result in
degradation of mass spectral and sensitivity performance.
Remember that column flows vary greatly with oven temperature. See “To
Calibrate Column Flow Linear Velocity” 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.
Conditioning columns
Conditioning a column before it is connected to the GC/MSD interface is
essential.
Table 5 Gas flows
Feature G3170A
G3175A
G3171A
G3176A
G3172A G3174A
High vacuum pump Diffusion Standard
turbo
Performance
turbo
Performance
turbo
Optimal gas flow, mL/min
*
* Total gas flow into the MSD = column flow + reagent gas flow (if applicable)
1 1 1 to 2 1 to 2
Maximum recommended gas flow,
mL/min
1.5 2 4 4
Maximum gas flow, mL/min
†
† Expect degradation of spectral performance and sensitivity.
2 2.4 6.5 6.5
Maximum column id 0.25 mm
(30 m)
0.32 mm
(30 m)
0.53 mm
(30 m)
0.53 mm
(30 m)
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