PerkinElmer PINAACLE 900 Series, Руководство по оборудованию и обслуживанию для клиентов

Страница: 261 / 390

245
Installing the High Sensitivity Plastic Nebulizer Spacer
2. Then rotate it, holding only the base, approximately 1/8 turn clockwise, i.e.,
until it reaches a stop and "locks" itself.
Installing the High Sensitivity Plastic Nebulizer Spacer
The plastic nebulizer assembly can be used with or without the spacer. Maximum
sensitivity for Air-Acetylene elements can be achieved without the use of the
spacer.
The addition of the spacer reduces the amount of sample delivered to the flame. It
is recommended to use the spacer for all elements analyzed with the nitrous oxide-
acetylene flame and for elements which are air-acetylene flame sensitive such as
calcium, chromium and gold. When analyzing some complex sample matrices, it
may be desirable to add the spacer to reduce chemical interferences.
To Install the Spacer
1. Hold the impact bead by its base only.
2. Rotate it approximately 1/8 turn counter clockwise before carefully lifting it
from the nebulizer's body assembly.
3. Place the spacer onto the back of the nebulizer and replace the impact bead.
4. Rotate the bead 1/8 turn clockwise to "lock" the bead in place.
Adjusting the Nebulizer for Maximum Absorbance
Adjust the nebulizer to achieve maximum absorbance as follows:
1. Ignite the flame.
2. Set up the spectrometer for the determination of copper, magnesium, or
another element which has an absorbing wavelength above 250 nm and whose
sensitivity is not dependent on the fuel/oxidant ratio.
Do not select an element
requiring a nitrous oxide-acetylene flame .
3. Aspirate a blank and let the flame stabilize.