Agilent Technologies 6820 GC User manual

Agilent Technologies

Flame Ionization Detector on a 6820 GC,

Accessory G4312A

Installation Guide

This installation guide provides procedures for installing a

Flame Ionization Detector (FID) on an Agilent 6820 Gas

Chromatograph (GC). Before following these procedures, refer

to safety information at the end of this document.

Parts list

Description Quantity

T-20 Torx screw M4 1

1/8-inch front ferrule brass 3

1/8-inch back ferrule brass 3

Nut 1/8-inch brass tubing 3

Cable tie 100 × 3 mm 4

Nut warmer cup assembly 4

Nut warmer insulation (19234-60715) 3

Nut warmer insulation (G1176-01006) 1

Micro switch cable assembly 1

FID sticker - English 1

FID sticker - Chinese 1

FID body 1

FID interface board 1

FID ship kit 1

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2 Installation Guide: Flame Ionization Detector (FID)

Tools

•Electrostatic protection such as a grounded wrist strap

•T-20 Torx screwdriver

•Diagonal cutter

•7/16-inch wrench

Configuration considerations

To achieve a standard factory configuration, it may be

necessary to move an already existing detector. For a

two-detector configuration, factory placement rules are as

follows:

•A thermal conductivity detector (TCD), if present, is always

placed in the front location.

•An FID, if present, is always placed in the back location.

Steps

1Preparing the GC

2Positioning and Securing the Detector

3Connecting the Detector

4Installing the Flow Control Module

5Installing the Ignitor Extension Cable

6Installing the Insulation Cup

7Restoring the GC to Operating Condition

Installation Guide: Flame Ionization Detector (FID) 3

Preparing the GC

1Switch off electrical power to the GC and disconnect the

power cord. Allow time for the oven and heated zones to cool.

Then switch off supply gases at their sources.

2Remove column(s) and any associated hardware from inside

the column oven.

3Lift the hinged GC top cover at its front edge to expose the

detector area. Remove the cover by raising it to vertical,

lifting its left hinge pin from its bracket, and then sliding the

cover to the left to free its right hinge pin.

4Remove two screws along the lower edge of the left side (flow

control) panel. Slide the panel slightly to the rear and lift it

off.

5In the same manner, remove two screws along the lower edge

of the right side (electronics) panel. Slide the panel slightly to

the rear and lift it off.

6Remove the back panel by removing two screws at its bottom

edge, loosening two screws at its top edge, and the lifting off

the two top screws.

WARNING Hazardous voltages are present in the mainframe when the GC is

connected to electrical power. Avoid potentially dangerous shock

hazards by disconnecting the power cord before removing the side

panels.

CAUTION Electronic components can be damaged by static electricity; use a

properly grounded static control wrist strap when removing the

electronics panel.

4 Installation Guide: Flame Ionization Detector (FID)

7Finally, remove the rear top cover by removing four screws,

two at each end.

8At this time, if necessary to achieve a standard factory

configuration, completely remove an existing detector and

reinstall it into its required location. If an existing detector is

being completely replaced by this new detector, carefully

store the old detector assembly and all associated parts in a

safe place for possible future use.

Positioning and Securing the Detector

1If necessary, remove the round metal cutout on the oven top

from the detector position to be used. Cut the metal circle

with diagonal cutters so its nibs are connected to the piece

removed. Discard the cutout.

CAUTION It is neither necessary nor advisable to separate a detector from its

flow control module, as doing so may cause leaks. Although handling

the detector and connected flow module as a unit is awkward, it can be

managed.

CAUTION GC insulation is made of refractory ceramic fibers. Ventilate your work

area. Wear long sleeves, gloves, safety glasses, and a disposable

dust/mist respirator. Dispose of unneeded insulation in a sealed

plastic bag.

Installation Guide: Flame Ionization Detector (FID) 5

2If necessary, lift out the die-cut insulation plug from the

detector position to be used.

3Carefully remove the scribed circle of insulation from the

oven top to create an opening into the oven.

Method 1: Use a sharp knife to cut out insulation using the

scribed circle as a guide.

Method 2: Pierce the insulation with a screwdriver. Rotate

the screwdriver around the edge of the scribed circle to

remove excess insulation. Remove any pieces of insulation

which fall inside the oven.

CAUTION Be careful to remove only insulation within the scribed circle.

6 Installation Guide: Flame Ionization Detector (FID)

4While positioning the detector into the cavity, use both

supplied insulation and removed oven insulation to pack

around the bottom and sides of the detector. The goal is to fill

all voids around the detector body as it is placed into the

cavity.

5Partially tighten the four pallet screws with a T-20 Torx

screwdriver, then tighten them evenly.

Pallet

Captive screws (4)

(Flow module

not shown)

Installation Guide: Flame Ionization Detector (FID) 7

Connecting the Detector

1Remove the PC board from its antistatic bag and slide it fully

into the slot and main circuit board connector associated

with the installed detector. Tighten the screw on the PC

board bracket with a T-20 Torx screwdriver to secure the

board.

CAUTION Printed circuit board components can be damaged by static electricity;

use a properly grounded static control wrist strap when handling the

detector board.

Insert into

main board

Tighten screw

8 Installation Guide: Flame Ionization Detector (FID)

2Attach the signal cable and ignition wire to the PC board.

Ignitor cable

Signal cable

Installation Guide: Flame Ionization Detector (FID) 9

3Connect the heater/sensor plug to the square receptacle

closest to the installed detector ("FD" for front detector, or

"BD" for back detector).

Installing the Flow Control Module

This section describes installation of the detector flow control

module.

Heater/Sensor plug

Heater and sensor receptacle

("BD", back detector)

Heater and sensor receptacle

("FD", front detector)

(Flow module not shown)

CAUTION It is neither necessary nor advisable to separate a detector from its

flow control module, as doing so may cause leaks. Although handling

the detector and connected flow module as a unit is awkward, it can be

managed.

10 Installation Guide: Flame Ionization Detector (FID)

1Determine the correct location for the detector flow control

module:

•Detector in the front position–use the upper detector

flow control module location.

•Detector in the back position–use the lower detector

flow control module location.

2Remove the existing detector label plate sticker from the

module location to be used and install the new one provided.

3Route hydrogen and air tubing between the flow module and

detector alongside existing tubing and wiring located behind

the oven top and through either slot to the detector. Avoid

making sharp bends in the tubing.

4At the same time, route the open-ended air vent tube from

the flow module towards the rear of the GC along the inside

of the flow control portion (left side) of the instrument. The

tube should be routed to be as straight as possible.

5Verify that the three valves on the flow module are in their

respective midway positions (rotated fully clockwise to a

stop, then rotated two to three turns counterclockwise) and

then slide the module onto two studs provided at the rear of

the flow panel.

CAUTION Handle the module carefully to avoid damaging its components and/or

connected tubing.

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