Table of Contents
Advertisement
Dionex PDA Operator's Manual
•
•
Contaminants in flow cell
Clean the cell (see
•
Incorrect lamp selected
If a UV wavelength is selected, make sure the deuterium lamp is on. If a
visible wavelength is selected, make sure the tungsten lamp is on. When a
lamp is on, the corresponding LED (
lighted.
•
Lamp needs replacement
The light output of the lamp decreases over time. The lower light output may
increase noise above an acceptable level, especially if the lamp has been in
service for more than 2000 hours. If this occurs, replace the lamp. See
Section 5.7
tungsten lamp, respectively.
•
Lamp incorrectly installed
Make sure that both lamps are fully seated in the optical bench. See
Section 5.7
or tungsten lamp, respectively.
•
Inappropriate reference wavelength
Select a reference wavelength in a quiet area of the spectrum where little
absorption occurs. Thermo Fisher Scientific recommends selecting a
reference wavelength below 380 nm for UV applications and above 600 nm
for visible applications. For more information, see
on page
•
Bandwidth is too narrow
Select a wider bandwidth and reference bandwidth, if appropriate for the
application. For guidelines when selecting the sample and reference
bandwidths, see
page
50.
76
Connect a backpressure line to the cell (see
increases the backpressure on the cell, thereby shrinking bubbles and
allowing them to pass more easily through the cell.
Section
5.2).
or
Section 5.8
for instructions on replacing the deuterium lamp or
or
Section 5.8
for installation instructions for the deuterium lamp
47.
"Bandwidth" on page 46
Section
or
DEUTERIUM – UV
"Reference Wavelength"
and
"Reference Bandwidth" on
B.3). This
) is
TUNGSTEN – VIS
Doc. 065378-01 1/12
Advertisement
Table of Contents
