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This allows the logic state (0 or + 5V) of the timed event terminals to control valve switching automatically by preprogrammed keyboard entries. The position of the valve can be determined at any time by monitoring the logic state of the terminals via the digital display on the front panel of the SP 8000. MICROPROCESSOR it SOLVENT STORAGE • Mobile Phase Composition • Flow Rate • Injector/ Autosampler • Oven Temperature • Graphing • Report Generation TERNARY W PROPORTIONER • Data System • Timed Commands (Control Actuator) 3 70-01 PNEUMATIC ACTUATOR OPERATOR INTERFACE Alphanumeric Keyboard LED Visual Display Printer/Plotter PRESSURE TRANSDUCER Fig.

ISBN 0-12-169001-6 32 Alan Henshall New approaches are, therefore, needed to solve these more difficult problems. As a result of the incorporation of micro­ processors into analytical instrumentation (1-7) capabilities are now routinely available which previously would have required considerable equipment modification in addition to the use of a minicomputer and extensive programming on the part of the user. In the area of HPLC, highly automated microprocessor-based instrumentation has recently become commercially available which opens-up new possibilities for solving difficult separation and analysis problems.

Photo­ meter is the most widely used HPLC detector and in many cases provides both the necessary sensitivity and selectivity. How­ ever, since the component of interest may have its absorbance maximum at a wavelength other than 254 nm, the sensitivity can often be improved through the use of a variable wave- 49 Copyright © 1979 by Academic Press, Inc. All rights of reproduction in any form reserved. ISBN 0-12-169001-6 Dale R. Baker and Rainer 50 Schuster length detector operated at the wavelength of maximum absorb­ ance for that component.

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