The reconditioned Waters Alliance 2790 HPLC system comes with a Waters 996 PDA detector. We also offer other Waters HPLC detectors as an option: - Waters 486 Tunable Detector - Waters 2487 Dual Wavelength Detector - Waters 474 Scanning Fluorescence Detector - Waters 2996 PDA Detector The reconditioned Waters Alliance 2790 HPLC system is in excellent condition. Solvent Management: Number of Solvents: One to four, three with vacuum degassing Solvent Conditioning: Vacuum degassing, three solvents plus rinse Typical Working Flow Range: 0.050 to 5,000 mL/min in 0.001 mL/min increments Programmable Flow Range: 0.000 and 0.010 to 10,000 mL/min in 0.001 mL/min increments. Compressibility compensation: Automatic and continuous. System delay volume: <400 µL, independent of back pressure, 1 mL/min. Piston seal purge: Integrated, active, programmable. Gradient profiles: Eleven (11) gradient curves [including linear, step (2 curves), concave (4 curves), and convex (4 curves)]. Dry/wet start: Automatic, front panel control. Flow control: Time (0.01 to 30.00 min in 0.01 min increments) to reach maximum flow rate. Maximum operating pressure: 5000 psi (345 bar) at 0.010 to 3,000 mL/min; programmable upper and lower limits. Composition range: 0.0 to 100.0% in 0.1% increments. Composition accuracy: ±0.5% absolute, independent of back pressure (proportionation valve pair test [degassed methanol:methanol/propylparaben, 2 mL/min, 257 nm]). Composition precision: <=0.15% RSD or <=0.02 min SD, whichever is greater, based on retention time (degassed 60% methanol:40% water dial-a-mix, 1 mL/min, six replicates, phenon mix, 257 nm). Flow precision:. <=0.075% RSD or <=0.02 min SD, whichever is greater, based on retention time (N = 6) or volumetric measurements (0.200 to 5,000 mL/min), isocratic premix. Flow Accuracy:. <=1% or 10 µL/min, whichever is greater (0.200 to 5,000 mL/min), degassed methanol, at 600 psi back pressure. Sample Management:. Number of Sample Plates:. Four plates total:. - Microtiter Plate – 96 or 384 wells. - Vial Plate – 2.0 mL vials (48). - Tube Plate – 0.5 mL microcentrifuge tubes (48) or 1.5 mL microcentrifuge tubes (24). - Open access plate - 2.0 mL vials (24 or 48). Sample temperature control: 4 to 40 °C, programmable in 1 °C increments. Maximum sample capacity: 1536 in four 384-well plates. Number of sample injections: 1 to 99 injections per sample. Sample introduction precision: <0.3% RSD, full loop 50 µL (standard wash/rinse conditions, degassed 60% methanol: 40% water Dial-a-Mix, 1 mL/min, six replicates, Paraben Mix, 257 nm). Sample volume linearity:. >0.999% correlation, 5 to 20 µL, partial fill in 50 µL loop, 3 µL pre- and post-sample air gap (standard wash/rinse conditions, degassed 60% methanol:40% water dial-a-mix, 1 mL/min, six replicates, paraben mix, 257 nm). Needle wash solvents:. Two: wash (strong solvent) and rinse (sample compatible) solvent A. Sample transfer:. <0.01% or <2.5 nL (standard wash/rinse volumes), whichever is greater (blank, 25 µL, 60% methanol:40% water, after six replicates, 25 µL propylparaben, 1 g/L, 257 nm). Waters 996 PDA Detector:. Specifications:. Dimensions: 11.5 x 22 inches (29 x 56 cm). Weight: 31 lbs (14.3 kg). Wavelength range: 190 to 800 nm. Wavelength accuracy: +1 nm. Linearity range: 5% at 2.0 AU, propylparaben, at 258. Spectral resolution: 1.2 nm. Baseline noise: +1.5 x 10^-5 AU peak to peak, dry, at 254 nm. Drift: 1 x 10^-3 AU/hour at 254 nm (after warm-up)