Double-Beam UV-Visible Spectrophotometer R-20, 0.1-5 nm Spectral Bandwidth (CAT#: STEM-AL-6978-ZJF)

This spectrophotometer is designed for UV-visible photometric and spectral measurements. It uses a double-beam optical arrangement to measure sample optical response across its configured wavelength region. The instrument supports routine absorbance, transmittance, concentration, and related analytical workflows described in the source. Integrated data functions support spectral scanning and other measurement modes without requiring separate basic control hardware. The display and control interface provide direct access to measurement settings, results, and spectral data. Data storage and external transfer functions support routine laboratory record handling. The optical and electronic design is intended to maintain stable operation during repeated laboratory measurements. Accessory and computer-control options allow the system to be adapted to different sample formats and analytical workflows.

Wavelength Range 190-1100 nm
Spectral Bandwidth 0.1-5 nm, Continuously Adjustable
Wavelength Accuracy ±0.3 nm
Wavelength Repeatability ≤0.15 nm
Transmittance Accuracy ±0.3%T Over 0-100%T
Transmittance Repeatability ±0.15%T Over 0-100%T
Stray Light ≤0.02%T At 220 nm
Noise ±0.0002 Abs At 500 nm And ±0.05% At 500 nm
Baseline Flatness ±0.0005 Abs Over 200-1090 nm
Drift ≤0.0004 Abs/h At 500 nm And ≤0.1%/h At 500 nm
Photometric Modes Transmittance, Absorbance, Concentration, Energy
Wavelength Setting Automatic
Display 10.1-Inch Color Touchscreen
Detector Photomultiplier Tube
Light Sources Deuterium Lamp And Tungsten Lamp
Power Supply AC 220 V/50 Hz Or 110 V/60 Hz
Power 120 W
Data Export USB Storage
Printing A4 Data And Spectra

Double-Beam Optical System
Integrated Photometric And Spectral Analysis Functions
Color Touchscreen Operation
USB Data Export
Direct Printer Connection
Optional Computer-Controlled Spectral Software
Open Software Platform
Compatible With Multiple Sample Holders And Accessories