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