Contains:. SD-1 solvent feed preparation module. AI-A1/AI-200 autosampler or manual injector. FC-1 faction collector. UV-D II absorption detector. N2000 data system or Varian Prostar workstation. To achieve high-quality HPLC separations, solvent flow rates must be accurate and reproducible. With its software-controlled, dual piston-operated design, the SD-1 solvent delivery preparation module meets these demanding requirements every time. A pressure transducer in each pump head provides instant flow and pressure feedback to the motors to maximize flow repeatability. Dual motor high-resolution drives ensure highly accurate solvent delivery, and the pulsation-free pump design extends column life. A simple change of pump heads allows flow rates from 0.01 to 800 mL/min at up to 6,000 psi, making the SD-1 ideal for use with analytical and preparative systems, allowing for hassle-free scaling that is easy to use achieve and is economical to operate. This Rainin Dynamax Model UV-1 UV1 Absorption Detector is a sensitive, low noise UV-VIS absorption detector for HPLC systems with optimized flow cell masks and unique reflective beam splitter. In the DYNAMAX MODEL UV-1, each of the mentioned noise characteristics are minimized to produce an absorption detector with a noise specification of less than 2×10^-5 AU. The first of the noise features can be compensated for by improved electronics, while low spatial sensitivity optics and improved flow cell design can minimize the effects of the second and third noise features. According to the present invention, noise associated with the third, fourth and fifth noise features are substantially eliminated through the inclusion of a unique reflective beam splitter with highly polished mirror surfaces and splitter and flow cell masks in the DYNAMAX MODEL UV-1 optical system, which Labprocure is responsible for this device.