Operating the 7693A Automatic Sampler 5
Operating Guide 63
To Adapt the 7693A ALS for the COC Inlet
The 7693A injectors can inject samples directly into 250- μm,
320-
μm, and 530- μm columns in GCs with a cool- on- column
inlet.
When performing cool on- column injections, the injector:
• Slows the carriage speed so the overall injection time
increases to 500 milliseconds.
• Lowers the tip of the syringe needle an additional 19 mm
into the column.
To adapt the injector and GC for cool on- column use, follow
these steps:
1 If necessary, remove the current syringe from the injector.
See “To Remove the Syringe on the 7693A ALS” for more
information.
2 If necessary, remove the injector from the mounting post
and unplug the injector cable. If desired, park it on a
parking post.
3 Select the on- column syringe needed for the column size.
See your Agilent catalog for consumables and supplies,
your GC operating documentation, and the Agilent web
site (www.agilent.com/chem) for a list of parts.
4 Replace the needle support foot with the supplied
on- column foot. See the Agilent 7693A Automatic Liquid
Sampler Installation, Operation, and Maintenance manual
for more information.
5 Install the on- column syringe. See “To Install a Syringe on
the 7693A ALS” for more information.
6 Prepare the GC inlet. See your GC operating
documentation for instructions.
• Check your needle to column size.
• Verify that the insert matches the needle size.
• If necessary, replace the septum.
For a list of other consumables needed to perform these
injections, see your GC operating documentation.
7 Plug in the injector cable.
8 Install the injector on the mounting post.
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