PerkinElmer PINAACLE 900 Series, Customer Hardware And Service Manual

Page: 373 / 390

357
Performance Problems
Contaminated during sample
preparation. Metal parts of pipets can be
attacked by acidic fumes.
Plastic pipet tips may be con-
taminated. Rinse utensils
before using them and rinse
pipet tips several times with
sample solution before finally
dispensing the sample solu-
tion. Beware of the environ-
mental contaminants, in a
less-than ideal clean labora-
tory (dirty laboratory)
Autosampler cups contami-
nated and also the autosam-
pler probe (pipette tip) is
contaminated. Rinse the cups in 10% v/v
HNO
3
overnight, then rinse
with deionized water
Increased baseline level,
increased noise. The lamp current is too high
or too low. Check the current, the lamp
might be failing and need
replacement. See also
Trou-
bleshooting: Spectrometer on
page 340
.
Carbon build-up in the tube is
causing emission. Install a new tube.
The furnace is not correctly
aligned. Check the peak plot from a
dry firing using a Cr lamp at
357.9 nm. If necessary align
the furnace.
Contaminated contact cylin-
ders. Clean the contacts, or replace
with a new pair of contacts.
See
Cleaning the Graphite
Tube and Contacts on page
267
.
Problem Possible Cause(s) Corrective Action