Knauer 2 Channel Semi Preparative Online Degasser

Knauer 2 Channel Semi-Preparative Online Degasser

The Knauer Online Degasser, a pre-owned, 2-channel system, is meticulously engineered for semi-preparative flow rates of up to 50 ml/min. At the heart of its design lies the cutting-edge Teflon AF fluoropolymer degassing membrane. Boasting over 200 times the gas permeability of standard Teflon, this membrane ensures excellent physical and chemical stability, enhancing system performance and reliability.

Its superior efficiency enables a reduced internal chamber volume of less than 7.7 ml per channel, optimizing the degassing process. For isocratic HPLC applications, the two chambers can be linked in series, delivering peak degassing efficiency. In gradient applications, simultaneous degassing of up to two eluents is feasible, while specialized applications may utilize a single degasser across multiple HPLC systems. The low dead volume ensures rapid reconditioning and minimizes solvent waste.

Key features include broad chemical compatibility suitable for general HPLC operations, zero hysteresis at higher flow rates, and minimal maintenance requirements—replacing check valves or other components is unnecessary, even under continuous operation. This system effectively prevents air bubble spikes in chromatograms, reduces retention time fluctuations, and resolves gradient reproducibility issues. Additionally, it mitigates the unwanted formation of chromophores that can hinder UV detection, oxidation or reduction interference with electrochemical detection, and fluorescence quenching.

Technical Specifications:

• **Dimensions**: 85 x 165 x 315 mm (W x H x D)
• **Weight**: 2.5 kg
• **Power Supply**: 85 – 265 V, 47 – 63 Hz, 20 W
• **Max. Flow Rate**: Up to 50 ml/min
• **Number of Channels**: 2
• **Degassing Method**: Gas permeation through Teflon AF amorphous fluoropolymer membrane
• **Degassing Efficiency**: < 0.5 ppm residual dissolved O2 at 1 ml/min
• **Dead Volume**: 7.7 ml
• **Solvent Applicability**: Universal, excluding hydrochloric acid and halogenated hydrocarbons, particularly hexafluoro isopropanol (HFIP)
• **Wetted Materials**: PEEK, Tefzel, Teflon AF
• **Vacuum Chamber**: Polypropylene and stainless steel

This second-hand system represents an exceptional option for laboratories seeking reliable, advanced degassing capabilities without compromising on performance or efficiency.