The Halo DB-20 is a high performance double beam Spectrophoto Meter suitable for many analytical applications where a higher level of accuracy is required.
Genuine Double Beam Optics True double beam optics ensure concurrent measurement of the sample and reference for improved stability, accuracy and reproducibility. The light beam is split in two using a half mirror so that one beam passes through the sample whilst the other passes through the reference side. Both beams are then measured on individual detectors. The reference side beam also acts to stabilise photometric values in a similar manner to the ratio beam principle.
Spectral Features Coma aberration elimination from the concave diffraction grating achieves a high resolution 1.5 nm. spectral bandpass and certifies compliance of the Halo DB-20 to the stringent European Pharmacopoeia standards.Other specifications include an impressive wavelength accuracy of ± 0.3 nm., noise level 0.0003 Abs (500 nm.) and stray light ≤ 0.05% (220 nm. NaI, 340 nm. NaNO2)
Built-in and Diverse Range of Measurement ModesPhotometry Mode: Perform quantitative analyses in either absorbance or transmittance modes. Select from single wavelength, up to 6 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 1100 nm. at any of 8 incremental and preset selectable selectable scan speeds starting from a high resolution 10 nm. / minute up to a swift 3600 nm. / 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 halogen tungsten and deuterium lamps typically found in higher end, analytical spectrophotometers, the Halo DB-20 wavelength range is an impressive 190 to 1100 nm. Furthermore, the dual lamp system results in higher accuracy then corresponding xenon lamps. Lamp switching is automatic and selectable from a wavelength range of 325 nm. to 370 nm. and both lamps are long life.
User friendly operation and information rich LCD display The extra large 190 mm. x 138 mm., 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. Other unique features include the ‘GO TO WL’ short cut key to allow direct input of a new wavelength into an existing measurement.
Validation Functions To ensure optimum instrument performance, a self-diagnostic function incorporating a number of parameters and wavelength calibration are automatically initiated upon start-up.
Stand alone or PC Operation The Halo DB-20 is fully equipped and capable of executing all functions in stand alone mode. Simply connect a standard laser printer for direct printouts of data and graphs. For more advanced analyses and reporting, the single slide of a switch places the Halo DB-20 under the direct control of the optional UV Detective™ software installed on a computer with Windows® XP Pro operating system
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