Libra S21 Visible Spectrophotometer

Libra S21 – Excellence in visible spectrophotometry for your analyses

The Libra S21 Visible Spectrophotometer from Biochrom is a high-performance solution designed to meet the needs of demanding laboratories looking for reliability, versatility and ease of use. This stand-alone device incorporates a high-intensity xenon lamp , ensuring a stable, long-lasting and efficient light source. With an intuitive interface and high-resolution LCD screen, the Libra S21 allows for smooth navigation between different measurement modes. Users can easily perform absorbance, transmission and concentration by factor measurements, as well as more advanced analyses such as enzyme kinetics, spectral scanning and standard curve construction.

The Libra S21's optical system is based on an aberration-corrected concave holographic monochromator , ensuring excellent wavelength accuracy and a bandwidth of less than 3 nm. Its scanning speed of up to 3000 nm/min makes it ideal for rapid and repeated analyses. Measurement reproducibility and stability are guaranteed, with a drift of less than ± 0.001A/h at 340 nm. The ability to save methods and print or export results (serial or parallel interface) makes it a tool that is perfectly suited to the modern laboratory environment.

Designed to integrate into a variety of workflows, the Libra S21 accepts a wide range of accessories: single or multiple cell holders, thermostatic cells, sippers, Peltier modules, etc. This modularity allows it to evolve according to the needs of the laboratory and cover a wide range of applications, from fundamental research to industrial quality control. It is also compatible with Acquire software for advanced analysis via PC (kinetics, spectra, multi-wavelength, etc.).

The Libra S21 complies with safety and electromagnetic compatibility standards (EN61010-1, EN61326), and its compact design (13 kg, dimensions 510 x 350 x 160 mm) makes it easy to integrate into benchtops. With its flexibility, accuracy and ease of use, the Libra S21 spectrophotometer is an essential reference for laboratories working in the visible range.

• Wavelength range: 325–1100 nm
• Light source: Xenon lamp
• Optical system: Concave grating monochromator 1200 lines/mm
• Maximum scanning speed: 3000 nm/min
• Spectral bandwidth: < 3 nm
• Wavelength accuracy: ± 1 nm
• Wavelength reproducibility: ± 0.5 nm
• Photometric range: -3,000 to +3,000 A / 0.1 to 200%T / -9,999 to 9,999 concentration units
• Photometric accuracy: ± 0.5% or ± 0.003 A at 546 nm
• Photometric reproducibility: ± 0.5% up to 3,000 A at 546 nm
• Stability: ± 0.001 A/h at 340 nm
• Stray light: < 0.05%T at 220 nm (NaI) and at 340 nm (NaNO₂)
• Detectors: Two silicon photodiodes
• Output interface: 9-pin serial and parallel Centronics
• Dimensions (W x D x H): 510 x 350 x 160 mm
• Weight: 13 kg
• Power supply: 100 - 240V AC ±10%, 50/60Hz, 80 VA