Agilent Technologies G1926A Instruction Manual

1. Loosen the four (4) Pozidrive screws holding the two attaching
fingers on the G1926A Bar Code Reader (BCR). These screws are
concealed by the cover, but there are access holes over each screw
position. See Figure 1.
2. Loosen the screws just enough, about ¼ turn, to allow the fingers to
be adjusted easily but secure enough to hold the position until the
screws can be re-tightened.
Figure 1. Bar code reader
Installing the G1926A Bar
Code Reader on the G2614A
Sampler Tray
Agilent 6890 Gas Chromatograph

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3. Install the Support Bracket Assembly, as shown in Figure 2 and
Figure 3, to the underside of the G2614A tray assembly before installing
the tray on the 6890 GC. Use the two long hex screws from the kit to
attach the support bracket at the pre-drilled and tapped holes provided
for mounting the BCR.
Figure 2. Support bracket installation, top view
Figure 3. Support bracket installation, bottom view

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4. Install the tray on the 6890 GC. Do not connect the cables at this time.
5. Hang the BCR on the tray as shown in Figure 4.
Figure 4. Mount reader to tray
6. Connect the data cable of the BCR to the Barcode port on the lower left-
hand side of the tray assembly. See Figure 5.
Figure 5. Connect data cable

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7. Connect the GC/Panel cable to the port at the lower rear of the tray
assembly. See Figure 6.
Figure 6. Connect power cable
8. Install at least one injector in the front or back position and connect its
power cable to the GC.
9. Set up a test vial handling sequence on the 6890 gas chromatograph
panel display and keypad. See Figure 7. This sequence will be used to
adjust the BCR position for vial transfer, placement, and pickup.
Figure 7. Sequence screen

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Setting up a trial sequence on the 6890 GC for BCR adjustment
1. Press the [SEQ] key.
2. Position the < cursor at PRIORITY METH # and enter 0(zero).
3. Scroll to TYPE and press either the [FRONT INJ] or [BACK INJ] key,
depending on where the injector is mounted
4. Scroll to #INJECTIONS/VIAL and enter 1.
5. Scroll to SAMPLES and confirm that it reads 1-1. If not, fix it.
6. Scroll to METHOD and enter 0.
7. Press [SEQ CONTROL]. Do not start the trial sequence until the
following checks and adjustments have been made.
BCR position adjustments for optimal performance
Figure 8 summarizes the adjustments that you will make.
Figure 8. Adjustment summary
GC
Support bracket
Tray
1. Adjust finger positions to receive vials
2. Adjust bracket mounting screws to level reader
3. Adjust height screws to provide finger clearance
Finger clearance space
Bar code reader

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1. With the BCR hanging on the tray (see Figure 8), confirm that the BCR
position can be easily adjusted from touching the edge of the tray to a
clearance of about 5 mm.
2. Hold the BCR level and start the 6890 GC trial sequence.
3. Watch the tray arm drop-off position as it makes its initial vial
placement in the BCR sample well. Move the BCR as required to catch
the vial with minimal contact between the vial and the edges of the well.
This will require a few trials to get the position correct. Side-to-side,
elevation, and distance to the tray edge adjustments are typically
required for optimal vial handling reliability.
4. When the position is correct, tighten the four finger attachment screws
to lock the BCR in position.
5. Adjust the bottom support bracket to bring the BCR parallel with the
front of the 6890 GC.
6. Loosen the height screws on the side of the support brackets and raise
or lower the bracket until there is a small gap—about the thickness of a
piece of paper—between the fingers and the tray. Tighten the screws.
7. Repeat the trial sequence several times, making fine adjustments to the
BCR position as required.
Vials and labels
Correct application of bar code labels and the type of vial used are critical
for reliable vial handling. Crimp cap vials (5181-3376 or 5181-3375), with
carefully applied barcode labels, are the most reliable. Screw cap vials may
not present a consistent target for the vial gripper because of variations in
the distance between the bottom of the cap and the top of the bar code label.
These variables are difficult for the user to control.
Changing vial types will generally require readjusting the BCR position.
Consequently, mixing vial types on the sampler quadrants is not
recommended. For best results, use crimp cap vials.

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Copyright© 2001
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610
Printed in USA AUG 2001
G1926-90100