Agilent Technologies 6850 Series II Instruction Manual

Installing the CO2Cryogenic
Agilent 6850 Series II Network GC System
Accessory G2625B
Oven Cooling Kit
This kit contains:
The kit is factory-assembled. Do not disassemble it during installation. The
GC must have firmware revision A.03.00 or higher.
Description Quantity
Chassis 1
Chassis Cover 1
Ship kit: 1
• Cooling coil 1
• Coil bracket 1
• Coolant filter 1
• 1/16-inch Vespel ferrule 2
• Port connector 1
• Stainless steel nut for 1/16-inch tubing 2
Restrictor tube 1
Machine screws, M4 x .7 12 mm 8
Installation sheet (this document) 1

2
Installing the CO2Cryogenic Oven Cooling Kit
Parts identification
Parts identification
Tools required
•Torx
®T-20 screwdriver
•Open-endwrench
•Cylinderwrench
• Long, flat-blade screwdriver
Chassis cover
Coil bracket
Cooling coil
Filter
Connector
Vespel ferrules
Machine screws
Restrictor tube
Chassis
Nuts

Installing the CO2Cryogenic Oven Cooling Kit
Overview
3
Overview
Caution Before continuing, read the safety information at the end of this document.
1. Disconnect the GC.
2. Install the inlet if you will be using a cool on-column inlet with cryo
blast or PTV inlet with cryo cooling.
3. Open the GC.
4. Install the chassis.
5. Install the restrictor tube.
6. Install the cooling coil.
7. Install the chassis cover.
8. Install the coolant filter.
9. Close the GC.
10. Connect the cryogenic coolant supply.
11. Return the GC to operating condition.
Disconnect the GC
WARNING Pressurized liquid CO2is a hazardous material. Take precautions to protect
personnel from high pressures and low temperatures. CO2in high
concentrations is toxic to humans; take precautions to prevent hazardous
concentrations. Consult your local supplier for recommended safety
precautions and delivery system design.
WARNING Do not use copper tubing or thin-wall stainless steel tubing with liquid CO2.
Both harden at stress points and may explode.
Caution Liquid CO2should not be used as a coolant for temperatures below –40°C
because the expanding liquid may form solid CO2—dry ice—in the GC oven. If
dry ice builds up in the oven, it can seriously damage the GC.

4
Installing the CO2Cryogenic Oven Cooling Kit
Install the inlet
1. Turn off the GC and unplug the power cord. Allow time for all heated
zones to cool.
2. Open the lid. If a column is installed, disconnect it at the detector end.
Remove the nut warmer, insulation, and capillary adapter, if present.
Close the lid.
3. Turn off all gases at their sources. Disconnect the carrier and detector
gas tubing from the back panel of the instrument.
Install the inlet
See the installation sheet for the particular inlet you are using to learn how
to install it.
Disconnect gas supply tubing
from these fittings

Installing the CO2Cryogenic Oven Cooling Kit
Open the GC
5
Open the GC
1. Open the lid and locate the counterbalance cam in the left rear corner
under the lid. Keeping the lid open with one hand, loosen the screw on
the right side of the cam and lower the stop plate (on the right side of
the counterbalance cam).
2. Raise the lid until it is stopped by the safety cable.
3. Raise the stop plate and tighten the screw to lock the lid in the upright
service position.
WARNING The lid is heavy. Always lock the lid when it is in the service position.
Counterbalance cam

6
Installing the CO2Cryogenic Oven Cooling Kit
Open the GC
4. Remove the seven T-20 Torx screws on the back panel. Tilt the top of the
panel away from the GC.
5. Follow the wires from the ventilating fan to the cable connector. (Not
all units have this fan.) Disconnect the cable and set the panel aside.
Remove
Cable
connector
Fan

Installing the CO2Cryogenic Oven Cooling Kit
Open the GC
7
6. Locate the plastic plug in the large hole on the left side of the GC. From
the back of the unit, depress the locking ribs on the sides of the plug
with a long, flat-blade screwdriver and remove it.
Plug
Locking ribs
Hole for
Plastic plug
was here
oven tubing

8
Installing the CO2Cryogenic Oven Cooling Kit
Install the chassis
Install the chassis
The chassis holds the cryo valve and related hardware.
1. If you are installing PTV cryo, install the valve onto the lower-left
position of the chassis, including the screws to hold it in place. See the
figure on the next page.
2. Pull any inlet cryo tube or wires through the hole on the side of the GC.
Screws to install

Installing the CO2Cryogenic Oven Cooling Kit
Install the restrictor tube
9
3. There are four mounting holes for the chassis on the left side of the GC
(two of them are in the row of ventilation slots at the top). Place the
chassis over the holes. Insert screws through the brass eyelets and
secure them loosely. The small black grommet behind the coolant outlet
union should be over the smaller hole in the side panel.
4. See the installation document for the inlet you are using to complete
this procedure.
Install the restrictor tube
1. There is a hole in the oven inside wall that lines up with the hole for
oven tubing on the side panel. Use a thin tool to make a hole through the
insulation from the interior of the oven to the grommet in the chassis.
Do not use any of the tubing to make the hole through the insulation.
2. The restrictor tube has a protective plastic cap on the long end. Push
this end with the cap in place, from inside the oven, through the hole in
the oven wall, the insulation, the hole in the side panel, and the rubber
grommet on the chassis.
3. Remove the plastic cap on the end of the tube. Install a stainless steel
1/16-inch nut and a Vespel ferrule. Insert the tube in the coolant outlet
union as far as it will go and finger tighten the nut.
Route any inlet
Coolant outlet union
Mounting holes
cryo tube or wires
through here
If PTV cryo,
install valve here
(one is behind the
valve)

10
Installing the CO2Cryogenic Oven Cooling Kit
Install the cooling coil
4. Inside the oven, check that the bend on the end of the restrictor tube
points up. Tighten the union nut an additional 1/2 turn.
Install the cooling coil
The cooling coil is part of the ship kit.
1. Inside the oven, locate the coil bracket. It is secured by the same screw
that holds the bottom of the heater shroud.
Tube bends up
Heater shroud
Coil bracket

Installing the CO2Cryogenic Oven Cooling Kit
Install the cooling coil
11
2. Place the cooling coil in the oven with the fitting at the upper left. The
bottom center of the coil should rest on the coil bracket.
3. Remove the stainless steel plug from the fitting on the end of the restrictor
tube. Leave the rest of the fitting in place.
4. Connect the fittings on the restrictor tube and the coil. Finger tighten
the 1/16-inch nut.
5. Press the coil against the oven floor and bend the three bracket legs
around it.
Cooling coil
Restrictor tube
Coil bracket

12
Installing the CO2Cryogenic Oven Cooling Kit
Install the chassis cover
6. Check that:
• The restrictor tube enters the oven and turns upward.
• The restrictor tube is connected to the coil and the fittings are finger
tight.
• The coil is near to, but makes minimal contact with the heater shroud.
7. Tighten the nut on the restrictor tube 1/2 turn past finger tight. Use open-
end and cylinder wrenches.
Install the chassis cover
1. Start two screws into the chassis from the bottom. Do not tighten them.
2. Place the cover over the chassis with the slots over the screws.
Slots placed over screws

Installing the CO2Cryogenic Oven Cooling Kit
Install the coolant filter
13
3. Add two more screws at the top, and tighten all four.
Install the coolant filter
Some GC owners have problems with particles in the CO2supply that clog
the cryo valve. The filter and connector prevent this. The filter is part of the
ship kit.
Locate the arrows (flow direction) on the body of the filter. Add the
connector to the exit end of the filter. Assemble the parts as shown. Tighten
the nut with a wrench.
The cryo chassis contains one or two coolant fittings.
Top screws
not shown)
(bottom screws

14
Installing the CO2Cryogenic Oven Cooling Kit
Install the coolant filter
One fitting
Remove the nut and ferrules from the coolant inlet fitting. Use these parts to
attach the filter/connector assembly to the inlet fitting.
Two fittings
The following graphic identifies the fittings for the oven and the inlet.
Oven coolant fitting
PTV Inlet coolant fitting

Installing the CO2Cryogenic Oven Cooling Kit
Close the GC
15
1. Install a “Tee” (part number 0100-0542) at the coolant fittings. Agilent
recommends that you use spectral-link tubing (part SL-8).
WARNING The high pressure LCO2requires thick-walled, high pressure stainless steel
tubing to avoid ruptures.
2. Remove the nut and ferrules from the coolant inlet fitting. Use these
parts to attach the filter/connector assembly to the inlet fitting or tee
fitting.
Close the GC
1. Reconnect the fan cable.
2. Place the back panel against the GC. Reinstall the seven screws that
hold the panel to the GC.
3. Lower the stop plate on the lid cam. Pull the lid forward until the cam
follower rests on the curved surface of the cam in front of the stop plate.
4. Raise the stop plate and tighten the screw. Close the lid.
Coolant filter (shown installed)
Tee fitting (customer provided)
Customer provided jumper and fittings

16
Installing the CO2Cryogenic Oven Cooling Kit
Connect the cryogenic coolant supply
Connect the cryogenic coolant supply
Liquid CO2is available in high-pressure tanks containing 50 pounds of
liquid. The tank must have an internal dip tube or eductor tube to deliver
liquid CO2instead of gas. Do not use a padded tank (one to which another
gas is added to increase the delivery pressure).
Caution Do not install a pressure regulator on the CO2tank, as vaporization and
cooling would occur in the regulator instead of the oven.
WARNING All fittings and tubing should be stainless steel. The pressure inside a liquid
tank can be as high as 1000 psi.
1. Connect a CGA 320 to 1/4-inch male NPT fitting to the tank followed by
a Swagelok®1/4-inch female NPT to 1/8-inch tube fitting (part number
SS-200-7-4).
2. Connect the tank to the cryogenic filter inlet with 1/8-inch diameter
heavy-wall stainless steel tubing. The tubing may be up to 50 feet long.
Allow some slack in the line to make movement of the tank or GC easier.
Coil and fasten the ends of the tubing to keep it from “whipping” if it
breaks.
Correct Incorrect
Dip tube

Installing the CO2Cryogenic Oven Cooling Kit
Restore the GC to operating condition
17
Restore the GC to operating condition
1. Install the capillary adapter, if used.
2. Restore the column connection.
3. Restore carrier and other gases to the instrument.
4. Restore power.
5. Apply your normal operating pressures. Leak-check the manifold, back
panel, and column fittings.

permission is prohibited, except as allowed under the copyright laws.
G2625-90117
© Agilent Technologies, Inc. 2004
All Rights Reserved. Reproduction, adaptation, or translation without
Part number G2625-90117
First Edition, May 2004
Printed in USA
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610
Safety Symbols
Warnings in the manual or on the instrument must be observed during
comply with these precautions violates safety standards of design and
liability for the customer’s failure to comply with these requirements.
In the manual
A warning calls attention to a condition or possible situation that could
A caution calls attention to a condition or possible situation that could
On the instrument
all phases of operation, service, and repair of this instrument. Failure to
the intended use of the instrument. Agilent Technologies assumes no
cause injury to the user.
damage or destroy the product or the user’s work.
Acknowledgements
Torx®is a U.S. registered trademark of Textron, Inc.
Swagelok®is a U.S. registered trademark of the Swagelok Company.
Replaces part number G2625-90107
See accompanying instructions for more information.
Indicates a hot surface.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
Indicates explosion hazard.
Indicates radioactivity hazard.
Indicates electrostatic discharge hazard.
Indicates pinch hazard.