DAD 6.1L/DAD 2.1L/MWD 2.1L user manual V6700, version 3.2
Intended Use
7
Side View
On the side of the detector, you find the connector for the operating panel
Control Unit in chapter ’Operating with Control Unit’ on page 26.
Features
In an HPLC system, the detector serves to detect substances in liquids and
show their concentration. The sensitivity of the detector depends on the
installed flow cell.
Optical Module
The detectors measure the light absorption of the sample in the ultraviolet
and visual spectra. The entire spectrum permeates the sample and after-
wards is split up by a grate. The split light falls onto a geometric array of
1024 (DAD 6.1L) or 256 (DAD 2.1L, MWD 2.1L) separate photodiodes –
the photodiode array.
The optical system of the DAD 6.1L is depicted in figure 4. An active tem-
perature control with 0.5 °C sensitivity ensures baseline stability for minimal
baseline drift.
Lamps
The lamps can be exchanged quickly and easily without the need of a ser-
vice technician.
DAD 6.1L
Two light sources, a deuterium lamp and a halogen lamp, cover the entire
UV-Vis wavelength range.
DAD
2.1L, MWD
2.1L
One deuterium lamp covers the UV wavelength range.
Mirror
DAD 6.1L
Maximum light intensity is provided by effectively mixing the light sources
from the deuterium and halogen lamp with a mirror using Polka Dot tech-
nology.
Legend
1
USB port for the
Control Unit
Fig. 3
USB port for the Control Unit
1
Legend
1
deuterium lamp
2
halogen lamp
3
flow cell
4
diode array sensor
5
diffraction grating
6
mirror
Fig. 4
optical system DAD
6.1L
3
5
1
2
4
6
