Installation 1
Installation and First Startup 11
Purged
packed
7890, 7820,
6890, 6850
Transfer line through
septum head
GC + HS (additive)* Purged packed inlet is not recommended for
HS use. The flow rate through the transfer line
needs to be high, which broadens peaks. If
used, set only a small flow from the PP inlet
(to sweep the inlet septum). Provide the main
column flow using the HS additive flow.
• Supports frequent column changes.
• Can be disconnected to support
autosampler or manual injection.
• Users will need to experiment with flows to
optimize the analysis.
Required hardware:
• G4562A Carrier Gas EPC Module
Accessory.
Cool
on-column
7890, 6890,
6850
Transfer line through
septum head
GC controls carrier
flow
Cool on-column inlet is not recommended for
HS use. For most analytes, instead use a SSL
or MMI and run the column up and through
the transfer line to the HS 6 port valve. (Use of
columns > 530 µm is not recommended in the
transfer line. Larger id columns are not
supported for this use.) If connecting the
column directly to the HS sampling valve, for
most analytes provide a small split flow so
that the inlet provides a small amount to
sweep septum, and let the HS provide most
flow, for example 0.1:1.
• The flow rate through the transfer line
needs to be high, which broadens peaks.
• Supports frequent column changes.
• Can be disconnected to support
autosampler or manual injection, but
realignment of ALS or change of inlet
hardware may be required.
• Users will need to experiment with flows to
optimize the analysis.
• With the cool on-column inlet, the transfer
line butts against column. This is not
preferred.
Required hardware:
• G4562A Carrier Gas EPC Module
Accessory.
• Cool on-column inlet hardware for transfer
line size.
Table 3 Supported headspace sampler–GC connections and control modes (continued)
Inlet type GC models Connection type Supports HS
carrier mode(s)
Comments
* Requires G4562A Carrier Gas EPC Module Accessory
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