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Installing and Adjusting the Impact Bead
The following should only be necessary when a new impact bead is
installed, or if the nebulizer has been replaced.
To install/adjust the impact bead:
1
2
The position of the adjuster block means that it can only be adjusted forward
NOTE
which moves the impact bead away from the nozzle).
3
4
5
6
This adjustment of the impact bead is close to the maximum
sensitivity position for easily atomized elements. It can be confirmed
by aspirating a 5 ppm copper standard and monitoring the
absorbance. Gradually turn the impact bead adjuster first clockwise,
then anticlockwise until the signal is at a maximum.
The reduced sensitivity setting is obtained by turning the impact
bead adjuster clockwise until the signal is about 40% of the maximum
signal.
Agilent 55B AA Spectrometer User's Guide
If necessary, remove the old impact bead as described in the
previous section.
Carefully insert the new impact bead into the nebulizer block,
pushing it in as far as possible so that the bead is in the throat of
the nebulizer nozzle (there should be a small gap of
approximately 0.5 mm between the end of the venturi and the
bead).
Carefully tighten the impact bead locking screw.
Turn the impact bead adjuster counter-clockwise until the block
appears midway in the cutout in the nebulizer block.
Check that the impact bead will not slip in the block by gentle
rotational pressure.
Reassemble the nebulizer and spraychamber components and
install the complete assembly in the sample compartment as
described in Chapter 3.
Maintenance
107
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