PerkinElmer Photovac 2020, Руководство пользователя

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Troubleshooting
135
WARNING
Do not remove or replace the UV lamp in a hazardous location.
Action: Install a new UV lamp. See Removing and
Replacing the UV Lamp on page 116.
Cause: High concentration of non-ionizable compounds.
Action: Chemical compounds, such as methane,
with ionization potentials greater than the
10.6 eV scatter and absorb the UV light.
Sensitivity may be decreased significantly.
Application with high backgrounds of such
materials, may be incompatible with 2020.
Contact the Applications Department for
more information.
Problem: Erroneously high readings.
Cause: Sampling environment is extremely humid.
Action: Water vapor may contain mineral salts
which carry a charge. The water vapor
becomes an electrolytic solution which
becomes ionized when it enters the
detector.
Atmospheric water in areas around the sea
or stagnant water may produce a response
in the absence of contaminants. The same
effect may be seen when conducting
ground water investigations in areas where
the water is hard because it contains a
significant concentration of minerals.
1
Cause: 2020 has not been calibrated properly.