Lamps; Optical System - Thermo Scientific Dionex ICS Series Operator's Manual

2.2.4

Lamps

The detector is shipped with a deuterium lamp (P/N 066347) for UV
wavelength detection and a tungsten lamp (P/N 066348) for visible and
near-infrared wavelength detection. The wavelength detection range is
from 190 to 900 nm. The table below lists the lamp(s) to use for various
wavelength detection ranges.
Wavelengths Detected
<345.0 nm
>670.0 nm
Between 345.0 and 670.0 nm
<345.0 nm and >670.0 nm
The lamps are installed behind the lamp housing cover (see
An identification chip is installed in each lamp at the factory. The chip
stores unique identification and status information about the lamp,
including the lamp type, serial number, number of lamp starts, lamp age,
and lamp intensity. When the lamp is installed, a contact on the lamp
connects the chip to the detector electronics. The detector downloads the
information to Chromeleon, where it is used for System Wellness and
Predictive Performance functions (see
2.3

Optical System

Figure 2-4 is a schematic of the optical system. A concave mirror (2) focuses the
light from the tungsten lamp (1) to the aperture of the deuterium lamp (3).
Another mirror (4) receives the combined light from both light sources and
focuses it into the entrance slit (6). A filter paddle (5) automatically places a cutoff
filter in the light path for use in analyses: A 360 nm filter is placed in line for
analytical wavelengths between 360 and 580 nm; a 580 nm filter is placed in line
for analyses at wavelengths above 580 nm.
The light passes through the entrance slit to the mirror (7) and on to the optical
grating (8), where the light beam is diffracted into the component wavelengths.
The angular position of the grating determines which wavelength is directed to the
reference mirror (10) and flow cell (12). The reference mirror (10) directs part of
the light beam to the reference detector (11). The remaining light travels through
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2 • Description
Lamp
UV
Vis
UV or Vis (or both)
UV and Vis
Section 2.6.2).
Figure 2-3).
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