TCD to FID Installation Guide

Installing the TCD to FID
Series Connector
4890, 5890, 6890 Gas Chromatographs
Accessory 19232C
The TCD to FID Series Connector, Accessory 19232C, is used to connect
the output flow of a Thermal Conductivity Detector (TCD) to the inlet of
a Flame Ionization Detector (FID) for a second analysis.
•
This accessory is not compatible with the FID Capillary-only units.
•
It is important to read this booklet before installing a new TCD.
The instructions in this booklet modify some of the installation
steps.
•
One TCD and one FID are required to use this accessory. If there is
another detector besides a TCD or FID installed, remove it.
•
If you need to install a new FID, refer to the installation booklet
included with your new detector. Do not turn on the GC or test the
detector until after the TCD to FID series connector is installed.
•
If you need to install a new TCD, refer to the installation booklet
included with your new detector. When ready to insert the TCD
detector assembly into the oven, follow the instructions under
"Adjust your vent tubing and install the TCD" below. Complete TCD
hardware installation through all of the wiring connections, then
return to the instructions in this book. Do not turn on the GC or
test the detector until after the TCD to FID series connector is
installed.
Prepare the GC
WARNING
2
Hazardous voltages are present in the instrument whenever the power cord
is connected. Avoid a potentially dangerous shock hazard by disconnecting
the power cord before working on the instrument. On the 4890 and 5890 the
power switch is located on the right side of the instrument. On the 6890 it is
located on the front of the instrument.
1.
Set the main power line switch to the off position.
2.
Disconnect the power cable from its receptacle.
3.
Allow time for the oven and heated zones to cool.
4.
When the heated zones are cool, turn off all gas supplies at the source.
5.
At the bottom of the detectors, inside the column oven, remove the
column and hardware associated with the inlet or detector (liner,
column/liner nuts, ferrules, makeup gas adapter, etc.).
6.
Lift the hinged top cover of the 4890 or 5890 at its front edge, exposing
the detector area. On the 6890, lift the detector cover to expose this
area.
4890/5890
Inlet cover
Top cover
Lift shaft
Press here to free cover
1/4-inch screw and washer
3
Remove the TCD detector weldment
1.
Cap the detector base.
2.
Remove the TCD detector cover by removing two screws, one from each
side of the detector cover.
3.
Cap the TCD vent port on the top of the detector.
Thermal cover
Insulation
PRT
Delta-T sensor
PRT sensor
Heater
TCD vent port
Vent support
Retaining screw
4
Caution
The insulation on the GC is made of refractory ceramic fibers. Ventilate
your work area. Wear long sleeves, gloves, safety glasses, and a disposable
dust/mist respirator. Dispose of insulation in a sealed plastic bag.
4.
Remove the preformed thermal insulation from around the detector to
expose the two screws securing the detector to the instrument
mainframe.
5.
Remove the two screws securing the detector to the instrument and
raise the block enough to expose the retaining screw on the vent
support.
If needed, slide the heater and sensor cartridges out of the block. The
two smaller cartridges are the sensors and must be handled gently to
prevent breakage.
5
Adjust your vent tubing and install the TCD
1.
Once the TCD assembly is removed from the oven enough to expose the
mounting screw on the vent support, or before a new TCD assembly is
installed, remove the retaining screw in the vent support and remove
the vent support.
2.
Bend the vent tubing down so that it is alongside the detector column
fitting. Align the tube so that it will fit in the slot in the oven liner.
TCD, 1/8-inch
Vent tube
Caution
3.
If installing a new TCD, continue with the instructions in the
installation booklet for your TCD through all of the wiring connections.
When finished, continue with the instructions under "Install the TCD to
FID Series Connector" in this booklet.
4.
If they were removed, install the heater, temperature sensor, and
delta-T sensor cartridges in the heated block.
5.
Carefully install the detector, securing it to the instrument with two
screws.
6.
Remove the caps from the detector base and the vent port.
When installing insulation, use care not to plug the vent port. If flow is
interrupted while the TCD is on, it will shorten its life dramatically.
7.
Caution
Avoid crimping the filament and delta-T sensor leads when installing the
TCD detector cover.
8.
6
Taking care not to block the vent port, install insulation around the
detector block.
Install the TCD detector cover and secure using two screws.
4890/5890
6890
Detector cover
7
Install the TCD to FID Series Connector
1.
Use the 1/8-inch stainless tubing nut, 1/8-inch stainless back ferrule and
1/8-inch stainless front ferrule to connect the TCD/FID jumper tube
weldment to the TCD vent tubing.
Install the 1/4-inch brass tubing nut, 1/8-inch brass back ferrule,
1/8-inch brass front ferrule between the TCD/FID jumper tubing and the
1/4 to 1/8-inch adapter.
2.
Use the 1/4-inch stainless tubing nut and 1/4-inch Vespel ferrule to
connect the adapter to the FID. A diagram of the installation is shown
below.
TCD vent tube
1/4-inch Vespel ferrule
1/8-inch stainless tubing nut
1/4-inch stainless tubing nut
!/8-inch stainless back ferrule
1/8-inch stainless front ferrule
FID 1/4 to 1/8-inch
adapter weldment
TCD/FID jumper weldment
8
1/8-inch brass front ferrule
1/8-inch brass back ferrule
1/8-inch brass tubing nut
Return your GC to operating condition
1.
2.
3.
4.
5.
6.
If any covers were removed to install a detector, replace them.
If a new detector was installed, make sure its gas supplies are properly
connected.
Plug in the GC power cord and restore power to the GC.
Restore all gas flows and establish them as described in your GC’s
Getting Started or Site Prep and Installation manuals.
Check for leaks.
Run the checkout chromatogram(s) as described in your GC's Operating
Manual.
• Because of the series connection, it may be necessary to re-adjust
the gas flows on your FID to optimize test results.
• It may be necessary to change the standard FID jet for the
0.030-inch jet (part no. 18789-80070) if you experience flame
ignition problems. See your GC's Operating Manual.
Table 1.
Parts Provided
Description
Part number
Front ferrule, 1/8-inch, brass
5180-4109 (10/pk)
Back ferrule, 1/8-inch, brass
5180-4115 (10/pk)
Tubing nut, 1/8-inch, brass
0100-0058
Front ferrule, 1/8-inch, stainless
5180-4110 (10/pk)
Back ferrule, 1/8-inch, stainless
5180-4116 (10/pk)
Tubing nut, 1/8-inch, stainless
0100-0057
Tubing nut, 1/4-inch, stainless
5180-4106 (10/pk)
Vespel ferrule, 1/4-inch
5080-8774 (10/pk)
FID 1/4 to 1/8-inch Adapter weldment
19231-80520
TCD/FID Jumper tube weldment
19302-80600
9
Copyright© 2001
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610
Printed in USA SEP 2001
19232-90147

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