Rugged enough for student use, these single-beam units are suitable for general colorimetric and spectrophotometric applications. A detector covers the entire 340 to 950nm wavelength range, extending measurements into the near infrared and ultraviolet ranges. Simple filter selection lever makes changing filters easy. The Spectronic 20D+ has a built-in computer and printer interface. Send data to your printer, or interface with your IBM/IBM compatible or Macintosh computer. Standard curves are calculated automatically. Insert the sample and read the concentration on display. If no standard is available, simply input the factor. Each spectrophotometer comes with a pack of twelve 1/2 in. (13mm) test tube cells and a 1/2 in. (13mm) adapter. Optional S83180 small-sample cuvet holder accommodates volumes as low as 0.75mL. Both models are UL/CSA listed. Three-year warranty. Specifications: Wavelength range: 340 to 940nm. Transmittance: 0 to 100%T. Absorbancy: 0 to 2A. Spectral slit width: 20nm. Wavelength accuracy: 2.5nm near 525nm. Wavelength precision: better than 1.0nm. Photometric accuracy: 2.0%T. Stray light: less than 0.5% over the entire wavelength range. Display: LED digital (20D+). Output 1.0V at 100%T (20/20D+) RS-232 serial I/O (20D+). Electrical requirements: 110/115V 50/60Hz. Dimensions: 161/4 x 81/2 x 131/2 in. (41 x 22 x 34cm). Weight: 18 lb. (8.2kg). New concentration mode on 20D+ model. Curriculum materials available separately (07-144-7E). 20D+ Digital Model. Spectrophotometer, Thermo Electron Spectronic 20 + /20D +. Rugged for student use, single-beam units suitable for general colorimetric and spectrophotometric applications. Detector covers entire 340 to 950nm wavelength range.
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