Capillary column installation quick reference guide

Document created by lily Employee on Oct 14, 2020Last modified by lily Employee on Oct 25, 2020
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Agilent Support Insights

 

This Information Applies To: All Agilent Gas Chromatographs, 6890, 6850, 7890, 7820, 8890, and 8860.

 

Issue:

A quick reference guide on the capillary column installation for the GC inlets and detectors.

 

Steps to follow:

 

Be careful! The oven and/or inlet/detector may be hot enough to cause burns. If either is hot, wear heat-resistant gloves to protect your hands.

Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.

Inlets

 

Split/Splitless inlet

  1. Place a septum over the column, then the column nut and ferrule. Trim the end of the column with a column cutter.
  2. Pull the column back so that 4-6 mm of the column is extending past the end of the ferrule (see Figure 1).
  3. Thread the column nut and column into the inlet and tighten slightly past where the column grabs – retighten after heating.
SSL inlet column installation-AgilentSSL inlet column installation-Agilent

 

Figure 1

1. Ferrule

2. Column nut

3. Septum

 

Purged packed inlet

  1. Place a septum over the column, then the column nut and ferrule. Trim the end of the column with a column cutter.
  2. Pull the column back so that 1-2 mm of the column is extending past the end of the ferrule (see Figure 2).
  3. Thread the column nut and column into the inlet and tighten slightly past where the column grabs – retighten after heating.
PPIP inlet column-Agilent
Figure 2

Multimode Inlet

Note: Make sure that the column adapter nut on the inlet base is fully threaded on and spinning freely – Collar Up! (see Figure 3)

MMI inlet column installation-Agilent

Figure 3

Position the column so it extends 10 to 12 mm(for high boilers you can use 12 to 14 mm)above the end of the ferrule (see Figure 4). 

MMI inlet column installation-Agilent
Figure 4

Tighten with two wrenches - 1/4” and 5/16” to prevent damage the inlet threads (see Figure 5).

MMI inlet column installation-Agilent
Figure 5

 

Cool On Column (COC) Inlet

Insert the column all the way into the inlet until you feel the spring tension – do not withdraw.

Tighten with two wrenches - 1/4” and 5/16” to avoid damaging the inlet (see Figure 5).

 

PTV Inlet

There should be 17 mm of the column above the Graphpak ferrule – the Graphpak ferrule should be installed with the graphite end towards the inlet base (see Figure 6).

The column nut is slotted. Use a 5 mm wrench to tighten the fitting.

PTV inlet column installation
Figure 6  

 

Volatiles Interface (VI) Inlet

There is a longer column nut for the VI so that you don’t have to remove the inlet block. The column nut number is G3504-20504.

VI inlet column installation-Agilent
Figure 7

 

Detectors

 

FID/NPD 

  1. Place a septum over the column, then the column nut and ferrule. Trim the end of the column with a column cutter.
  2. Thread the column nut and column into the detector base. Gently insert the column into the detector until it bottoms, then withdraw 1 to 2 mm before tightening the nut.
  3. The dimensions shown of 48 and 68 mm are provided for very narrow columns (<100um) which may go all the way through the jet.
FID NPD column installation-Agilent
Figure 8

 

TCD – Using the standard Low Leakage Ferrules

  1. Place a 1/8” Swagelok nut and the back and front ferrules over the column. (Be sure to select the front ferrule size to match the column) Trim the end of the column with a column cutter.
  2. Thread the column nut and column into the detector base. Insert the column all the way into the detector jet until it stops, then withdraw 1 to 2 mm before tightening the nut. Retighten after heating.
TCD column installation-Agilent

 

Figure 9

1. Front ferrule

2. Back ferrule

3. Nut

 

TCD – Original Design Column Adapter

  1. Install the column adapter to the 1/8” Swagelok TCD base using a graphite/vespel ferrule.
  2. Thread the column nut and column into the adapter. Insert the column into the detector until it bottoms, then withdraw 1 to 2 mm before tightening the nut.
TCD column installation-Agilent

 

Figure 10

1. Ferrule, 1/8-inch

2. Nut, 1/8-inch

3. Capillary column adapter

 

uECD

  • Thread the column nut with column into the make-up gas adapter. Insert the column all the way into the mixing liner until it stops, then withdraw 1 to 2 mm - Use 2 wrenches to tighten the nut. Retighten after heating.
  • Be sure that the make-up gas adapter is installed with the 19 mm dimension shown (see Figure 11).
    ECD column installation-Agilent
    Figure 11
  • The 70 mm dimension shown is provided for very narrow columns (<100um) which may go all the way through the mixing liner (see Figure 12).
    ECD column installation-Agilent
    Figure 12  

FPD

  1. Install the column into the Column Measuring Tool Provided.
  2. Trim the column such that 1 mm extends from the end of the tool.
  3. Tighten the column nut and mark the position of the column at the back of the nut.
  4. Install into the detector base.
FPD column installation-Agilent

Figure 13

1. Score column here

2. Column measuring tool

3. Ferrule 

4. Column nut

5. The column length *

* It depends on the GC and FPD type. FPD+ for 7890B,8890,8860 is 137.5 mm, FPD for 7890A, and some 6890 is 145 mm, FPD for some early 6890 is153 mm.

 

 

Learn more on how to effectively install the capillary GC columns:

Installation Care and Maintenance of Capillary GC Columns e-Learning course on Agilent University

 

Keywords: GC column installation, Capillary column installation, GC inlet, GC detector

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