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)

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

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

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

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