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Nebulizer
The nebulizer uses a capillary tube, venturi, and impact bead to convert the sample
solution into a spray.
NOTE
When you receive your instrument, the nebulizer will be assembled and installed in
the sample compartment. For instructions on how to remove, disassemble, and
reassemble the nebulizer refer to 'Reassemble the nebulizer block' - Page 93.
Ensure that the nebulizer is correctly assembled in the nebulizer block with the
metal capillary protruding through the locking thimble (see 'Reassemble the
nebulizer block', Page 97.
Impact bead
The impact bead is located within the nebulizer block and is aligned so that the
bead is centered directly in front of the capillary tube outlet. Large droplets from
the capillary hits the glass impact bead and forms a fine mist of the sample
solution.
Instructions on replacing the Impact bead are in the Maintenance section, see
Page 101.
Liquid trap
The liquid trap enables excess solution to be drained from the nebulizer assembly.
The trap is designed to provide a gas seal under all normal gas flows when using
solutions having a specific gravity greater than 0.75.
Connect a length of tubing to the lower drain outlet and into a suitable waste
vessel. The free end of the tube must always remain above the level of liquid in the
waste vessel. Use vessels made of an inert material that will not corrode or shatter
in the event of a flashback. Do not use waste vessels made of glass or metal.
If you are using organic or toxic liquids in the spray chamber, a length of tubing
must be connected to the vapor vent (upper nipple) to vent toxic vapors to an
active exhaust system. The tubing should run parallel to the drain tubing and must
slope downwards to prevent it becoming blocked should liquid overflow and drain
from the vapor vent.
CAUTION
Do not lead the vapor vent tubing to the waste vessel.
Agilent 55B AA Spectrometer User's Guide
Attach the spray chamber to the nebulizer block and install the complete
assembly in the sample compartment as described in 'To assemble the spray
chamber' - Page 109.)
Overview
43
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