Agilent 6890 User manual
Agilent 6890
Gas Chromatograph
Maintaining Your GC
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2007
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or translation into a foreign language) without prior
agreement and written consent from Agilent Technologies, Inc. as governed by
United States and international copyright
laws.
Manual Part Number
G1530-90010
Edition
First edition, March 2007
Printed in USA
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610 USA
Warranty
The material contained in this document is provided “as is,” and is subject to being changed, without notice,
in future editions. Further, to the maximum extent permitted by applicable
law, Agilent disclaims all warranties,
either express or implied, with regard
to this manual and any information
contained herein, including but not
limited to the implied warranties of
merchantability and fitness for a particular purpose. Agilent shall not be
liable for errors or for incidental or
consequential damages in connection
with the furnishing, use, or performance of this document or of any
information contained herein. Should
Agilent and the user have a separate
written agreement with warranty
terms covering the material in this
document that conflict with these
terms, the warranty terms in the separate agreement shall control.
Safety Notices
CAUTION
A CAUTION notice denotes a hazard. It
calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in damage to the product
or loss of important data. Do not proceed beyond a CAUTION notice until
the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a hazard.
It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in personal injury or
death. Do not proceed beyond a
WARNING notice until the indicated
conditions are fully understood and
met.
Contents
1 About Maintaining the GC
Overview of Maintenance 10
Tools and Materials Required for Maintenance 12
Safety Information 14
Preparing the GC for Maintenance 15
2 Maintaining Capillary Columns
Consumables and Parts for Columns 18
To Install a Capillary Column Hanger 19
To Condition a Capillary Column 20
To Cut a Loop from a Column 23
To Reverse a Column and Bakeout Contaminants 24
To Attach a Capillary Column Using SilTite Metal Fittings 26
To Disconnect Fused Silica Tubing From a SilTite Fitting 29
3 Maintaining the Split/Splitless Inlet
Consumables and Parts for the Split/Splitless Inlet 32
Exploded Parts View of the Split/Splitless Inlet 35
To Install a Capillary Column with the Split/Splitless Inlet 36
To Change the Septum on the Split/Splitless Inlet 40
To Clean the Septum Seat in the Insert Assembly of the Split/Splitless
Inlet 42
To Change the Liner and O-Ring on the Split/Splitless Inlet 44
To Replace the Gold Seal on the Split/Splitless Inlet 46
To Replace the Filter in the Split Vent Line 48
To Clean the Split/Splitless Inlet 49
To Bakeout Contaminants from the Split/Splitless Inlet 51
4 Maintaining the Purged Packed Inlet
Consumables and Parts for the Purged Packed Inlet 54
Exploded Parts View of the Purged Packed Inlet 57
To Install a Capillary Column with the Purged Packed Inlet 58
To Change the Septum on the Purged Packed Inlet 62
Maintaining Your GC 3
To Clean the Septum Seat in the Purged Packed Inlet 64
To Install an Adapter on the Purged Packed Inlet 66
To Change the O-Ring on the Purged Packed Inlet 68
To Change the Glass Liner on the Purged Packed Inlet 69
To Install an Insulation Cup on the Purged Packed Inlet 71
To Clean the Purged Packed Inlet 72
To Bakeout Contaminants from the Purged Packed Inlet 74
To Install a Packed Metal Column 75
To Install a Packed Column Adapter on a Detector Fitting 77
To Install a Packed Glass Column 79
To Condition a Packed Column 82
To Install Ferrules on a Packed Metal Column 84
5 Maintaining the COC Inlet
Consumables and Parts for the COC Inlet 86
Exploded Parts View of the COC Inlet 89
To Install a Capillary Column with the COC Inlet 90
To Check the Needle-to-Column Size on the COC Inlet 93
To Change a Septum on the COC Inlet 94
To Install an Insert on the COC Inlet 96
To Clean the COC Inlet 98
To Replace the Needle Support Assembly in a 7683B Injector 100
To Replace a Needle in a Syringe 103
To Replace the Fused Silica Needle in a Syringe for the COC Inlet 104
To Bakeout Contaminants from the COC Inlet 106
6 Maintaining the PTV Inlet
Consumables and Parts for the PTV Inlet 108
Exploded Parts View of the PTV Inlet 110
To Install a Capillary Column with the PTV Inlet 111
To Clean the Septumless Head on the PTV Inlet 114
To Replace the Septumless Head Teflon Ferrule on the PTV Inlet 117
To Change the Septum on the PTV Inlet 119
4 Maintaining Your GC
To Clean the Septum Seat in the Septum Head Assembly of the PTV
To Change the Liner on the PTV Inlet 123
To Replace the Inlet Adapter for the PTV Inlet 126
To Replace the Filter in the Split Vent Line 128
To Bakeout Contaminants from the PTV Inlet 129
7 Maintaining the VI
Consumables and Parts for the VI 132
Exploded Parts View of the VI 134
To Install a Capillary Column with the VI 135
To Attach a Sample Transfer Line to the VI 138
To Remove the VI Interface 139
To Clean the VI 140
To Install the VI Interface 141
To Replace the Filter in the Split Vent Line 142
Inlet 121
To Bakeout Contaminants from the VI Inlet 143
8 Maintaining the FID
Consumables and Parts for the FID 146
Exploded Parts Views of the FID 149
Selecting an FID jet 151
To Attach a Capillary Column Adapter on an Adaptable FID 153
To Install a Capillary Column in the FID 155
To Replace the FID Collector Assembly 158
To Replace an FID Jet 160
To Perform Maintenance on the FID Collector Assembly 163
To Check the FID Leakage Current 171
To Check the FID Baseline 172
To Install the FID Insulation Cup Assembly (Adaptable FID Only) 173
To Install the Optional FID PTFE Chimney Insert 175
To Bakeout the FID 176
9 Maintaining the TCD
Consumables and Parts for the TCD 180
Maintaining Your GC 5
To Install a Capillary Column in the TCD 182
To Install the Optional TCD Capillary Column Adapter 184
To Install a Capillary Column with the Optional TCD Capillary Column
Adapter 185
To Bakeout Contaminants from the TCD 187
10 Maintaining the uECD
Important Safety Information About the uECD 190
Consumables and Parts for the uECD 192
Exploded Parts View of the uECD 194
To Replace the uECD Fused Silica Indented Mixing Liner and Install the
Makeup Gas Adapter 195
To Install a Capillary Column in the uECD 198
To Install the Detector Insulating Cup 200
To Bakeout the uECD 202
11 Maintaining the NPD
Consumables and Parts for the NPD 206
Exploded Parts View of the NPD 209
Selecting an NPD jet 210
To Attach a Capillary Column Adapter on an Adaptable NPD 212
To Install a Capillary Column in the NPD 214
To Replace the NPD Bead Assembly 217
To Maintain the NPD Collector, Ceramic Insulators, and Jet 222
To Check the NPD Leakage Current 228
12 Maintaining the FPD
Consumables and Parts for the FPD 230
Exploded Parts View of the FPD 232
To Install a Capillary Column Adapter in the FPD 233
To Attach a Capillary Column to the FPD 235
To Change the FPD Wavelength Filter 237
To Remove the FPD Vent Tube 240
To Replace the FPD Ignitor 242
To Install the FPD Vent Tube and Cover 244
6 Maintaining Your GC
13 Maintaining a Valve
Consumables and Parts for Valves 246
Exploded Parts View of GC Rotary Valves 247
To Replace a Gas Sampling Valve Loop 248
To Align a Rotary Valve Rotor 250
To Replace a Rotary Valve in the Valve Box 251
To Remove the Upper Valve Box 254
To Install the Upper Valve Box 256
Maintaining Your GC 7
8 Maintaining Your GC
Agilent 6890 Gas Chromatograph
Maintaining Your GC
1
About Maintaining the GC
Overview of Maintenance 10
Tools and Materials Required for Maintenance 12
Safety Information 14
Preparing the GC for Maintenance 15
This section provides an overview of the maintenance
procedures included in this document. It also lists the tools
needed for routine maintenance and the safety information one
should be aware of before performing a maintenance task.
Agilent Technologies
9
1 About Maintaining the GC
Overview of Maintenance
Where to find a procedure
This manual details the routine tasks needed to maintain the
6890 Gas Chromatograph (GC). The procedures assume a basic
knowledge of tool use and of GC operation. Readers are, for
example, expected to know how to:
• Safely turn devices on and off
• Load methods
• Change component temperatures, flows, and pressures
• Make typical pneumatic connections using Swagelok and
other standard fittings
Included in this manual are chapters on maintaining the
following GC components:
• Capillary Columns
• Split/Splitless Inlet
• Purged Packed Inlet
• COC Inlet
• PTV Inlet
• Volatiles Inlet (VI)
• FID
• TCD
• uECD
• NPD
• FPD
• Valves
Each chapter includes:
• A list of the most commonly used consumables and parts for
the component
• An exploded parts view of the component
• Detailed procedures for routine maintenance tasks
associated with the component
10 Maintaining Your GC
Early Maintenance Feedback feature
The Agilent Lab Monitor & Diagnostic Software includes the
capability to alert users of upcoming maintenance needs. This
feature, called Early Maintenance Feedback, notifies users when
a counter (such as a septum counter, jet cleaning counter,
injection counter, or uECD wipe test counter) has reached the
specified maintenance point. After performing the required
maintenance, reset the applicable counter to resume using the
Early Maintenance Feedback feature. Refer to the features
provided by the Agilent Lab Monitor & Diagnostic Software for
more details on this.
About Maintaining the GC 1
Maintaining Your GC 11
1 About Maintaining the GC
Tools and Materials Required for Maintenance
Table 1 lists the tools needed for most GC maintenance
procedures. The specific tools required to perform a
maintenance procedure are listed in step 1 of the procedure.
Tab le 1 Tools and materials for GC maintenance
Common tools
Wrench, angled, septum nut (19251-00100)
Wrench, open-end, 1/4-inch and 5/16-inch (8710-0510)
Wrench, open-end, 9/16-inch and 7/16-inch (8710-0803)
Wrench, capillary inlet (G3452-20512)
Flathead screwdriver
Column cutter, wafer (5181-8836, 4/pk)
Driver, nut, 1/4-inch (8710-1561)
T-20 Torx key (8710-1807) or screwdriver
T-10 Torx key (8710-2140) or screwdriver
*
*
*
*
*
*
*
*
3-mm hex key wrench (8710-2411)
Electronic flow meter(s) or bubble meter(s) capable of calibrated measurements
at 1, 10, and 100 mL/min flow ranges.
Electronic leak detector
Magnifying loupe, 20X (430-1020)
Metric ruler
Bench vise (for setting Swagelok fittings)
Razor or sharp knife
Tweezers (8710-0007) or thin needle-nose pliers (8710-0004)
Needle-nose pliers
ESD wrist strap (for installing new components)
Gloves, heat-resistant (for handling hot parts)
Wooden cotton swab (for removing FID filters)
Tools and materials for cleaning procedures
Cleaning brushes—The FID cleaning kit (9301-0985) contains appropriate
brushes for cleaning detectors and inlets
Cleaning brushes—(8710-1346) For cleaning split/splitless inlet split vent
fitting, FID and collectors
12 Maintaining Your GC
About Maintaining the GC 1
Tab le 1 Tools and materials for GC maintenance (continued)
Jet cleaning wire (.010 inch)
Clean, lint-free cloth (to protect contamination-sensitive detector parts)
Small ultrasonic cleaning bath with aqueous detergent (for cleaning detector
and inlet parts)
Gloves, clean, lint-free, nylon (large: 8650-0030, small: 8650-0029) (for handling
contamination-sensitive parts)
Steel wool, 0- or 00-grade (for cleaning an inlet’s septum seating surfaces)
* Included with the GC ship kits
Maintaining Your GC 13
1 About Maintaining the GC
Safety Information
Before performing a maintenance task, read the important
safety and regulatory information found in the 6890 User
Information book.
14 Maintaining Your GC
Preparing the GC for Maintenance
Before most maintenance procedures, the GC must be made
ready. The purpose of this preparation is to avoid damage to
both the instrument (electronics, columns, etc.) and the user
(shocks, burns).
Column and oven preparation
The main hazards here are temperature (burns) and column
exposure to air.
• Cool the oven by changing its setpoint to 35 °C. This allows
the oven fan to assist cooling.
• Leave the carrier gas flow On until the oven has cooled. This
protects the column from oxygen damage.
Inlet preparation
About Maintaining the GC 1
We are concerned with the possibility of burns and air intrusion
into the column.
• After the oven and columns have cooled, reduce all inlet
flows to 0.0 and turn the temperatures Off.
• For inlet-only maintenance, leave all detectors at their
normal setpoints except for the TCD filament, which should
be turned Off.
• If the column is to be removed, cap both ends to keep air out.
Detector preparation
This is another burn hazard area, plus the possibility of damage
to the very sensitive electronics.
Some detectors (uECD, FPD, NPD) require 12 hours or longer to
stabilize from the detector-off condition.
• To cool the detector, reduce the temperature setpoint to
35 °C.
• Some detectors (FID, NPD, FPD) use high voltages. The high
voltage supply is part of the electrometer. Turn it Off to
disable the high voltage.
• The filament in the TCD will be damaged if exposed to air
while hot. To protect the filament, turn it Off.
Maintaining Your GC 15
1 About Maintaining the GC
16 Maintaining Your GC
Agilent 6890 Gas Chromatograph
Maintaining Your GC
2
Maintaining Capillary Columns
Consumables and Parts for Columns 18
To Install a Capillary Column Hanger 19
To Condition a Capillary Column 20
To Cut a Loop from a Column 23
To Reverse a Column and Bakeout Contaminants 24
To Attach a Capillary Column Using SilTite Metal Fittings 26
To Disconnect Fused Silica Tubing From a SilTite Fitting 29
Agilent Technologies
17
2 Maintaining Capillary Columns
Consumables and Parts for Columns
See the Agilent catalog for consumables and supplies for a more
complete listing, or visit the Agilent Web site for the latest
information (www.agilent.com/chem/supplies).
Tab le 2 Nuts, ferrules, and hardware for capillary columns
Column id (mm) Description Typical use Part number/quantity
.530 Ferrule, Vespel/graphite,
0.8-mm id
Ferrule, graphite, 1.0-mm id 0.53-mm capillary columns 5080-8773 (10/pk)
Column nut, finger-tight (for
0.53-mm columns)
.320 Ferrule, Vespel/graphite,
0.5-mm id
Ferrule, graphite, 0.5-mm id 0.1-mm, 0.2-mm, 0.25-mm, and
Column nut, finger-tight (for
.100- to .320-mm columns)
.250 Ferrule, Vespel/graphite,
0.4-mm id
Ferrule, graphite, 0.5-mm id 0.1-mm, 0.2-mm, 0.25-mm, and
Column nut, finger-tight (for
.100- to .320-mm columns)
.100 and .200 Ferrule, Vespel/graphite,
0.37-mm id
0.45-mm and 0.53-mm capillary
columns
Connect column to inlet or detector 5020-8293
0.32-mm capillary columns 5062-3514 (10/pk)
0.32-mm capillary columns
Connect column to inlet or detector 5020-8292
0.1-mm, 0.2-mm, and 0.25-mm
capillary columns
0.32-mm capillary columns
Connect column to inlet or detector 5020-8292
0.1-mm and 0.2-mm capillary
columns
5062-3512 (10/pk)
5080-8853 (10/pk)
5181-3323 (10/pk)
5080-8853 (10/pk)
5062-3516 (10/pk)
Ferrule, Vespel/graphite,
0.4-mm id
Ferrule, graphite, 0.5-mm id 0.1-mm, 0.2-mm, 0.25-mm, and
Column nut, finger-tight (for
.100- to .320-mm columns)
All Ferrule, no-hole Testing 5181-3308 (10/pk)
Capillary column blanking nut Testing–use with any ferrule 5020-8294
Column nut, universal Connect column to inlet or detector 5181-8830 (2/pk)
Column cutter, ceramic wafer Cutting capillary columns 5181-8836 (4/pk)
18 Maintaining Your GC
0.1-mm, 0.2-mm, and 0.25-mm
capillary columns
0.32-mm capillary columns
Connect column to inlet or detector 5020-8292
5181-3323 (10/pk)
5080-8853 (10/pk)
To Install a Capillary Column Hanger
Maintaining Capillary Columns 2
WARNING
WARNING
Be careful! The oven may be hot enough to cause burns. If the
oven is hot, wear heat-resistant gloves to protect your hands.
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
1 Prepare the column and oven for maintenance. See
“Preparing the GC for Maintenance” on page 15.
2 Select either the front or back hanger position. (Hanger is
shown in back position.)
Front position
Back position
3 Insert the ends of the hanger into the slots in the selected
position.
Maintaining Your GC 19
2 Maintaining Capillary Columns
To Condition a Capillary Column
1 Gather the following:
• One 7/16-inch, and 1/4-inch wrenches
• No-hole ferrule (See “Consumables and Parts for
Columns” on page 18.)
• Column nut
=
WARNING
Do not use hydrogen as the carrier for conditioning! It could vent
into the oven and present an explosion hazard.
2 Prepare the column and oven for maintenance. See
“Preparing the GC for Maintenance” on page 15.
WARNING
WARNING
Be careful! The oven and/or detector may be hot enough to cause
burns. If the detector is hot, wear gloves to protect your hands.
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
3 Install the column into the inlet using the new ferrules. See:
• “To Install a Capillary Column with the Split/Splitless
Inlet” on page 36
• “To Install a Capillary Column with the Purged Packed
Inlet” on page 58
• “To Install a Capillary Column with the COC Inlet” on
page 90
• “To Install a Capillary Column with the PTV Inlet” on
page 111
• “To Install a Capillary Column with the VI” on page 135
20 Maintaining Your GC
Maintaining Capillary Columns 2
4
Cap the detector column fitting.
5 Set a minimum velocity of 30 cm/s, or as recommended by
the column manufacturer. Let gas flow through the column at
room temperature for 15 to 30 minutes to remove air.
WARNING
WARNING
6 Program the oven from room temperature to the maximum
temperature limit for the column. Increase the temperature
at a rate of 10 to 15 °C/min. Hold at the maximum
temperature for 30 minutes.
7 Prepare the GC for maintenance. See “Preparing the GC for
Maintenance” on page 15.
Be careful! The oven and/or detector may be hot enough to cause
burns. If the detector is hot, wear gloves to protect your hands.
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
8 Attach the column to the detector. For details, select your
specific detector from the following list:
• “To Install a Capillary Column in the FID” on page 155
• “To Install a Capillary Column in the NPD” on page 214
• “To Install a Capillary Column in the TCD” on page 182
• “To Install a Capillary Column in the uECD” on page 198
• “To Install a Capillary Column Adapter in the FPD” on
page 233
Maintaining Your GC 21
2 Maintaining Capillary Columns
9
Restore the analytical method.
• For FID or FPD, immediately turn off the flame.
• For NPD, immediately turn off the bead.
10 After the GC becomes ready, wait 10 minutes, then ignite the
detector flame or bead.
22 Maintaining Your GC
To Cut a Loop from a Column
1 Gather the following:
2 Prepare the inlets for maintenance. See “Preparing the GC
Maintaining Capillary Columns 2
• New ferrule(s) for the column inlet connection
• Column cutter
for Maintenance” on page 15.
WARNING
WARNING
Be careful! The oven and/or inlet may be hot enough to cause
burns. If either is hot, wear heat-resistant gloves to protect your
hands.
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
3 Loosen the inlet column nut and remove the column from the
inlet.
4 Uncoil one loop of column from the column hanger.
5 Cut the unwanted loop from the column.
6 Install the column into the inlet using the new ferrules. See:
• “To Install a Capillary Column with the Split/Splitless
Inlet” on page 36
• “To Install a Capillary Column with the Purged Packed
Inlet” on page 58
• “To Install a Capillary Column with the COC Inlet” on
page 90
• “To Install a Capillary Column with the PTV Inlet” on
page 111
• “To Install a Capillary Column with the VI” on page 135
Maintaining Your GC 23
2 Maintaining Capillary Columns
To Reverse a Column and Bakeout Contaminants
1 Gather the following:
• 1/4-inch wrench
• Column cutter
2 Prepare the GC for maintenance. See “Preparing the GC for
Maintenance” on page 15.
WARNING
WARNING
Be careful! The oven and/or detector may be hot enough to cause
burns. If the detector is hot, wear gloves to protect your hands.
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
3 Disconnect the column from the inlet and detector.
4 If necessary, cut a loop from the column. (See “To Cut a Loop
from a Column” on page 23.) Do not attach the column to the
inlet.
5 Remove the column from the hanger and reverse its position
(inlet and detector ends) and place the column back on the
hanger.
6 Attach the column to the inlet.
Select your specific inlet from the following list:
• “To Install a Capillary Column with the Split/Splitless
Inlet” on page 36
• “To Install a Capillary Column with the Purged Packed
Inlet” on page 58
• “To Install a Capillary Column with the COC Inlet” on
page 90
• “To Install a Capillary Column with the PTV Inlet” on
page 111
• “To Install a Capillary Column with the VI” on page 135
7 Attach your column to the detector.
Select your specific detector from the following list:
• “To Install a Capillary Column in the FID” on page 155
• “To Install a Capillary Column in the NPD” on page 214
24 Maintaining Your GC
Maintaining Capillary Columns 2
• “To Install a Capillary Column in the TCD” on page 182
• “To Install a Capillary Column in the uECD” on page 198
• “To Install a Capillary Column Adapter in the FPD” on
page 233
8 Set the column flow to the normal operating value, or set the
capillary column gas velocity to 30 cm/s.
For split splitless, PTV, and VI inlets select split mode and set
the split vent flow to 200 mL/min.
9 Purge the column with carrier flow for at least 10 minutes
before heating the oven.
10 Set the inlet temperature to 300 °C or 25 °C above the
normal operating temperature.
11 Set the column oven 25 °C above the GC method final oven
temperature to bake contaminants out of the inlet, mostly
through the split vent. Do not exceed the column
manufacturer’s maximum temperature limit.
12 Bakeout for 30 minutes.
Maintaining Your GC 25
2 Maintaining Capillary Columns
To Attach a Capillary Column Using SilTite Metal Fittings
This procedure is used to attach a capillary column to a
Microfluidic splitter or switch or an Ultimate Union.
1 Gather the following:
• SilTite ferrules (see Table 3)
• Swaging nut for SilTite ferrules (G2855-20555)
• Two 1/4-inch open-end wrenches
• One 7/16-inch open-end wrench
• Column cutting tool (5181-8836)
• Internal nut (G2855-20530)
• Lint free gloves
Tab le 3 Available SilTite metal ferrule packages
CAUTION
Part number SilTite ferrule description
5188-5361 For 0.2- to 0.25-mm columns
5188-5362 For 0.32-mm columns
5188-5363 For 0.53-mm columns
Wear clean, lint-free gloves to prevent contamination of parts with
dirt and skin oils.
2 Pass the tubing end through the internal nut and SilTite
ferrule leaving approximately 1 cm of fused silica tubing
protruding beyond the ferrule. Thread the swaging nut onto
the internal nut with the tube protruding.
26 Maintaining Your GC
Maintaining Capillary Columns 2
Using two wrenches against each other, tighten the two nuts
3
together a little at a time, occasionally checking to see if the
ferrule is gripping the tube. When the ferrule just starts to
grip, notice position of the nuts and then tighten one of the
nuts by turning 45 to 60 degrees of rotation, but no more
than 60 degrees (one flat).
4 Remove the swaging nut.
Maintaining Your GC 27
2 Maintaining Capillary Columns
NOTE
5
Using a wafer column cutter, trim the tubing at the small end
of the ferrule, leaving approximately 0.3 mm of tubing
extending beyond the ferrule.
Check the end of the tube with a magnifier. The end of the
tube need not be perfectly square, but should not have cracks
that extend under the ferrule.
It is important that the tube end does not extend beyond 0.5 mm from the
end of the ferrule.
6 Insert the assembled ferrule and nut into the SilTite fitting.
Tighten with a wrench by only 15 to 20 degrees of rotation.
28 Maintaining Your GC
Maintaining Capillary Columns 2
To Disconnect Fused Silica Tubing From a SilTite Fitting
Loosen and remove the internal nut. If tubing and ferrule do not
come free, insert a pointed object (pen, paper clip) into the
ferrule release hole and press firmly. You will hear a click as the
ferrule releases.
The SilTite ferrule seal should remain leak-free for many
disconnections and reconnections.
Maintaining Your GC 29
2 Maintaining Capillary Columns
30 Maintaining Your GC
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