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Spectrophotometer Halo DB-20 UV-Visible Double Beam
Spectrophotometer Halo DB-20 UV-Visible Double Beam
- Halo DB-20/DB-20S
The Halo DB-20 is a high performance double beam spectrophotometer suitable for many analytical applications where a higher level of accuracy is required.
Spectral Features
Coma aberration elimination
from the concave diffraction grating achieves a high resolution 1.5nm
(DB-20S : 1nm) spectral bandpass and certifies compliance of the Halo
DB-20 to the stringent European Pharmacopoeia standards. Other
specifications include an impressive wavelength accuracy of 
0.3nm, noise level 0.0003Abs (500nm) and stray light 
0.05% (220nm NaI, 340nm NaNO2).
Built-in and Diverse Range of Measurement Modes
Photometry Mode:
Perform quantitative analyses in either absorbance or transmittance
modes. Select from single wavelength, up to 6 different individual
wavelengths, nucleic acid/protein A260/A280 ratios and set up
calibration curves with up to 20 standards for concentration
measurements.
Time Scan: Perform kinetic measurements for time periods ranging from 1 minute to >27 hours. Measurement intervals are factory preset and automatically selected when the scan time is set.
Wavelength scan: Perform a full spectral scan from 190 to 1,100nm at any of 8 incremental and preset selectable scan speeds starting from a high resolution 10nm/minute up to a swift 3,600nm/minute. Data is displayed as either numerical values or a graphical spectrum. Furthermore perform downstream processing of data, such as peak/valley search or smoothing, directly on board or with the optional Halo UV Detective software.
Dual Lamp Advantage
By virtue of the long life,
halogen tungsten and deuterium lamps, the Halo DB-20s wavelength range
is an extensive 190nm - 1,100nm. Besides, the dual lamp system results
in higher accuracy than corresponding xenon lamps. Lamp switching is
automatic and selectable from a wavelength range of 325nm to 370nm.
User Friendly Operation and Information Rich LCD Display
The
extra-large 190mm x 138mm, backlit LCD screen with adjustable
brightness control displays a large array of data also in graphical
format. The seamless and chemical resistant keypad is designed for easy
and quick selection of navigation and function features whilst
protecting against any laboratory spills.
Validation Functions
To ensure optimum instrument
performance, self-diagnosis incorporating a number of parameters and
wavelength calibration are automatically initiated upon start-up. The
Halo DB-20 is also equipped with a GLP/GMP feature for analyses
requiring validation and auditing. Parameters such as wavelength
accuracy, wavelength reproducibility, bandpass, baseline flatness,
baseline stability and noise level can be all validated and the audit
report printed.
Stand alone or PC Operation
The Halo DB-20 is
fully equipped and capable of executing all functions in standalone
mode. Simply connect a standard laser printer for direct printouts of
data and graphs. For more advanced control, analyses and reporting, the
simple slide of a switch places the Halo DB-20 under the direct control
of the optional UV Detective software.
On-Board Data Storage
Up to 20 operating programs
and up to 10 sets of measurement data can be stored in the flash memory
of the Halo DB-20. Programs can easily be recalled, edited and
deleted. In standalone mode, data (in text format) can be downloaded
directly to an external memory stick via the USB port and transferred
for further processing to any computer loaded with commercial
spreadsheets (such as Microsoft Excel)
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