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7
The nebulizer is now ready for use. If you have just installed the
nebulizer, you should carry out the performance checks described on
Page 88.
Low Vacuum Setting
In low vacuum mode (the high solids setting) the capillary position is
adjusted close to the end of the venturi throat. The greater clearance
around the capillary tip reduces clogging caused by solutions with a
high solids content. With this setting, the vacuum at the capillary tip
is relatively low. Consequently, you must use wide bore (0.64 mm ID)
plastic sampling capillary to achieve the uptake rates required for
maximum sensitivity. At this setting, the uptake rate is more
sensitive to variation in sample liquid level.
To set the nebulizer to low vacuum mode:
1
2
The nebulizer is now ready for use.
At this setting, the uptake rate will be sensitive to the hydrostatic head of the
NOTE
liquid in the sample container, thus care is required to minimize variations in
liquid levels in the sample and standard containers.
Setting Zero Uptake Rate
Before adjusting the nebulizer for use with organic solvents, you
should set zero uptake rate as follows, using distilled water as the
solvent:
1
2
3
Agilent 55B AA Spectrometer User's Guide
Hold the thimble so it cannot turn, then turn the locking ring
until it is firmly against the spray chamber body to lock it in
place.
Fit the wide bore (0.64 mm ID) tubing to the capillary.
Loosen the locking ring, and turn the thimble (and ring) fully
clockwise.
Fit the wide bore (0.64 mm ID) tubing to the capillary.
Turn the locking ring clockwise until it is up against the nebulizer
body.
Turn the thimble clockwise as far as it will go.
Operation
87
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