Agilent Technologies G3437A User manual

Agilent Technologies
Agilent G3437A Side-Mounted Thermal
Conductivity Detector
For the Agilent 7890A Gas Chromatograph
Installation Instructions
Parts Supplied
Table 1 Parts supplied
Description Quantity
Third Detector Box Kit Assembly 1
•Manual flow bezel 1
•Blank Label Plate 2
•Third detector flow 1
•Third detector box cover assembly 1
•Frame support 1
•Corner bracket 1
•Bolt and nuts (for corner bracket) 2
1/8" Bulkhead Union, 316 SST (with 2 Swagelok nut and ferrule) 1
Bulkhead Fitting Retainer, 316 SST 1
Screw, flathead, M4 × 0.7 10mm (long, for side cover) 2
Screw, machine, M4 × 0.7 12mm (for bezel, frame support, bulkhead fitting
retainer, flow frame, TCD module, EPC module, PCB cover)
18
Captive screw, M4 × 0.7 12mm (long, for flow frame top) 2
Captive screw, M4 × 0.7 (for solenoid valve bracket) 2
1/8" nut and ferrule set brass, Swagelok (for EPC module and T-manifold) 2
Wrist strap, disposable 4-LG 1-W 1
T-manifold assembly 1
AUXZONE/VLV BOX cable 1
MSD HTD ZONE cable 1
Cable, switching valve 1
Solenoid valve bracket 1

2Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
Parts Identification
Figure 1 TCD frame parts identification
Bracket (3rd EPC) 1
Frame (3rd TCD) 1
PCB Cover (3rd TCD) 1
Third detector EPC communication cable 1
Third detector heated zone cable 1
Third TCD module 1
TCD PCB 1
TCD Ship Kit 1
•TCD back ferrule, 1/8" inlet 1
•TCD front ferrule, 0.787 mm, 2/pk 2
•TCD front ferrule for 0.53 mm 2
•TCD front ferrule for 0.43 + OD col 2
•TCD packed column adapter for 1/4" packed column 1
Table 1 Parts supplied (continued)
Description Quantity
Third detector flow
Manual flow bezel
Third detector heated zone
cable
Bulkhead fitting assembly
Blank label plate (2)

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 3
Figure 2 TCD module parts identification
i
Figure 3 TCD board assembly
T-manifold assembly
Bracket (3rd EPC)
TCD module
Frame (3rd TCD PCB)
TCD PCB
PCB cover (3rd TCD)

4Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
Figure 4 Solenoid valve bracket and aux zone/valve box cable
Solenoid valve bracket
Aux zone/valve box cable
connector

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 5
Tools Required
•T-10 and T-15 Torx drivers
•Phillips head screwdriver
•Small, flat-blade screwdriver
•1/8” wrench
Installation Procedure
This procedure explains how to install the thermal conductivity detector
(TCD) accessory as a third detector on the Agilent 7890A Gas
Chromatograph (GC).
Prepare the GC
1Turn off the GC and unplug the power cord.
2Unsnap the pneumatics cover by pressing the black clips on the sides of the
cover. Lift the cover up and off.
3Remove the detector cover by raising the cover vertically and then firmly
lifting up on the right side of the cover to free the lid from the hinge pin.
Slide the pin out of the hole on the left side hinge and put the cover aside.
4Remove the top right electronics cover by loosening one screw located in
the left front side. Open the cover 90 degrees and lift up on the right side.
Slide the cover off the pin on the left side.
5Detach the rear top cover by removing the four screws. Slide the top cover
to the left until free, gently tilting out the lower cover when it interferes
with removal.
6Remove the electronics side cover by unscrewing the single top screw. Slide
the cover to the right and lift off.
7Remove the left side cover by loosening the top screw, sliding the panel
towards rear, and lifting the cover off.
8Put on the wrist strap and attach the ground to the GC frame sheet metal
for electrostatic protection.
WARNING Refer to the Safety Manual that came with your Agilent 7890A Gas
Chromatograph for hazards that may exist when maintaining your
instrument.

6Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
Install the solenoid valve bracket
1Skip to step 6 if the solenoid valve bracket is already installed on your GC.
2Insert the four smaller valve plugs and two larger aux heater plugs into the
slots in the solenoid valve bracket. See connections in figure 5.
3Connect the aux zone/valve box cable connector into the analog and power
(A&P) board.
4Align the solenoid valve bracket so the cables are coming from the bottom
of the bracket and the screws are located at the top over the screw holes in
the frame. See Figure 5.
5Tighten the captive screws into the frame.
6Connect the MSD heated zone cable (long) to the bracket in the first (A1) or
last (A2) position. Record its position for use in the final configuration.
Figure 5 Aux zone/valve box cable and solenoid valve bracket installed
Install the MSD heated zone cable (long)
1Thread the MSD heated zone cable (long) across the top of the GC, passing
under the detector gas lines and through channels to the right side of the
instrument.
Aux zone/valve box
cable connection
Bracket captive
screws
MSD heated zone
cable (installed in
first position)
Solenoid valve
bracket
AI V1 V2 V3 V4 A2

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 7
2Unfasten the main communication grommet and include the MSD heated
zone cable in the bundle. Refasten the grommet.
Figure 6 MSD heated zone cable included in main communication grommet
3On the left side, unfasten the grommet and include the MSD heated zone
long cable. Leave the grommet unfastened until the communication cable is
routed at the end of the installation procedure.
Assemble the TCD frame
1Attach the manual flow bezel to the third detector flow frame with three
M4 × 12 mm screws.
Figure 7 Attaching the manual flow bezel to the third detector flow frame
Grommet
MSD heated zone cable
Manual flow bezel
Screw locations
Third detector flow frame

8Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
2Attach the frame support by screwing four screws through the bezel into
the support.
Figure 8 Frame support installed
3Attach the corner bracket, using bolts and nuts, between the bezel and
frame.
Figure 9 Corner bracket installed
M4 x 12 mm screws
M4 x 12 mm screws
Frame support
Corner bracket

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 9
4Attach the two blank label plates to the front side of the bezel to completely
cover the holes.
Figure 10 Attaching the two blank label plates
5Attach the third detector heated zone cable (short) to the frame by
inserting the cable plug into the sheet metal notch, inserting the cable into
the grommet, and sliding the grommet into the cutout on the frame.
Figure 11 Third detector heated zone cable installed in frame
6Attach the bulkhead fitting retainer to the rear facing side of the frame by
tightening the screw. See Figure 12.
7Insert the bulkhead fitting through the frame so that the fixed nut is
positioned in the retainer.
Blank label plate
Front side of bezel
Grommet
Third detector heated zone
cable
Sheet metal notch

10 Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
8Secure the fitting by attaching and tightening the backing nut.
Figure 12 Bulkhead fitting installed in frame
Prepare the detector mounting
1Locate the position on the side of the GC for the detector. Remove the round
metal cutout at this location using diagonal cutters. Make the cuts so that
the metal nubs remain attached to the discarded metal circle.
2Remove and discard the circular insulation plug.
3Using the flat screwdriver, punch a hole (approximately ¼-in ID) in the
oven insulation.
Figure 13 Metal cutout removed and hole punched in oven insulation
Bulkhead fitting (without
ferrule)
Screw for bulkhead retainer

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 11
Attach the third detector flow frame
1Connect the third detector heated zone cable (attached to the back of the
third detector flow frame) to the MSD heated zone cable (long), which was
attached to the GC in a previous step.
2Orient the third detector flow frame with the GC by positioning the circular
cutouts at the bottom edge of the frame with the four screw holes at bottom
edge of the GC.
3Using a Torx driver, attach the frame first with two 4 mm × 12 captive
screws at the top edge of the frame and then with four screws through the
circular cut outs at the bottom edge of the frame.
Figure 14 Third detector flow frame mounted to GC
Top screw locations
Bottom screw
locations

12 Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
Attach the frame (3rd EPC)
1Remove the two Torx screws from the top of the module.
Figure 15 Removing the two Torx screws from the module
2Position the bracket (3rd EPC) on the top of the module with the switching
valve wire passing through the bracket cutout.
3Attach the bracket (3rd EPC) to the module with the screws.
Figure 16 Attaching the bracket (3rd EPC) to the module
Torx screws
Bracket (3rd EPC)
Screws
Switching valve
routed through cutout

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 13
Install the TCD module
1Temporarily rest the detector module on the floor of the third detector flow
frame. Slide the bottom cage of the EPC module into the supporting slots on
the frame.
2Tilt the EPC module forward slightly and position the switching valve wire
in the frame cut out slot, making sure that it is not pinched when the
module is in place against the instrument. See Figure 17.
3Attach the EPC module to the frame at the two upper screws.
Figure 17 Installed EPC module
4Place the detector over the circular detector cut out.
5Attach the detector to the GC by using three Torx screws.
6Connect the TCD heater cable to the third detector heated zone cable plug
located on the third detector flow frame wall above the detector. Tuck the
cable between the side of the GC and the bezel. See Figure 18.
Switching valve wire
not pinched
Screws
Supporting slots
EPC module

14 Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
7Orient the pneumatics tubing downwards so that it doesn’t interfere with
the TCD board installation.
Figure 18 TCD module installed
Attach the T-manifold assembly
1Using a 1/8” nut and ferrule, attach one end of the T-manifold assembly
short tubing arms to the EPC module reference gas fitting.
2Using a 1/8” nut and ferrule, attach one end of the T-manifold assembly
short tubing arms to the EPC module makeup gas fitting.
Pneumatic tubing
Heater cable connected and
tucked behind bezel
Screw locations

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 15
3Using a 1/8” nut and ferrule, attach the long end of the T-manifold assembly
tubing arm to the bulkhead fitting.
Figure 19 T-manifold assembly installed
Attach the frame (3rd TCD)
Position the frame with the flat surface facing up and the captive screws
below. Align the frame with the holes in the GC and tighten the captive screws.
Figure 20 Frame (3rd TCD) installed
Connection at
bulkhead fitting
Connection at
Reference gas
fitting
Connection at
Makeup gas fitting
Captive screws
Frame (3rd TCD)

16 Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
Attach the TCD board
1Remove the TCD logic board from its static control bag.
2Align the TCD board with the frame (3rd TCD) so the board circuits are
facing up and the board notches are to the left of the frame hooks.
3Slide the TCD board under the hooks so that all the slots engage all the
hooks and the board lies flat and evenly on the frame. Align the thumb
screw directly over the screw hole.
4Attach the TCD board to the frame by tightening the thumb screw.
Figure 21 TCD board attached to frame (3rd TCD)
Attach the PCB cover
1Insert the PCB cover tabs into the frame (3rd TCD) slots and tilt the cover
into position over the board.
2Fasten the cover with a Torx screw.
Thumbscrew
Frame hooks
Frame hooks

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 17
3Attach the filament leads (thick black wire sheath) and the ΔPRT leads
(thin white wire sheath) from the TCD to the TCD board as the
configuration shown in Figure 22. Using a small flat-blade screwdriver to
push on the connector tabs, firmly push away from the connector hole,
insert the appropriate lead into the connector hole, and release the tab to
complete the connection.
Figure 22 TCD connected to TCD board
Route the communication bus cable
1Connect the plug on the communication cable labeled Aux DET2 to the plug
labeled AuxDET2 in the EPC module area.
2Connect the plug on the communication cable labeled EPC5 to the plug
labeled EPC5 in the EPC module area.
Figure 23 Communication bus cable connections
Orange connector tabs
EPC5 connection Aux DET 2 connection

18 Installation Instructions
Agilent G3437A Side-Mounted Thermal Conductivity Detector
3Thread the cables from the EPC module area behind the pneumatics area to
the third detector flow frame.
4Bundle the MSD heated zone cable and the communication cable with the
existing cables using the grommet located in the side carrier frame directly
above the EPC module. Refasten the grommet in the cutout.
Figure 24 MSD heated zone cable included in left side grommet
5Connect the TCD switching valve cable to the switching valve lead on the
EPC module. Connect the other end of the TCD switching valve cable to the
board in the back left connector. See Figure 25.
6Connect the Third DET EPC cable to the communication connector on the
EPC board. See Figure 25.
Grommet
MSD heated zone cable

Agilent G3437A Side-Mounted Thermal Conductivity Detector
Installation Instructions 19
7Connect the Third DET cable to the TCD board in the bottom connector.
Figure 25 TCD module cable connections
Restore the GC to operating condition
1If installed, remove the red TCD cap on the TCD exhaust.
2Install the third detector side cover using two Torx flathead screws.
3Replace the top and side panels.
4Plug in the GC and turn on the power.
5Unlock the GC keypad.
aPress [Options].
bSelect Keyboard & Display.
cSelect Hard Configuration lock, then press [No/Off].
6On the GC keypad, press [Configure] then [Aux Det #].
7Select the Aux Detector and press [Enter].
8On the keypad, press [Mode/Type].
9Scroll to select the Aux Heater and press [Enter]. The GC displays a prompt
to select a heater to install. Select Aux 1 if you attached the MSD heated
zone cable to plug A1 and select Aux 2 if you used plug A2. A caution
message will appear instructing you to reboot.
Switching
valve
connections
Third DET
connection

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Warranty
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in future editions. Further, to the maximum extent permitted by applicable law, Agilent disclaims all warran-
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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
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these terms, the warranty terms in the separate agreement shall control.
©Agilent Technologies, Inc. 2007
Printed in USA and China
Second edition, June 2007
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10 Reboot the GC.
aPress [Options].
bScroll to Communications and press [Enter].
cScroll to Reboot the GC? and press [On/Yes] twice to reboot the GC and
have the changes take effect.
11 The new EPC you have installed must be properly calibrated before the
detector is ready for application use. To calibrate the pressure and gas type,
refer to the Calibration section of the Advanced User Guide.
12 After completing pressure and gas type configuration, connect the carrier
gas source line to the bulkhead fitting, restore gas pressure, and leak check
all fittings.
13 To calibrate the flow, refer to the Calibration section of the Advanced User
Guide.