6
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.
