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
≾ࠊো

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.