the Varian CDS-111... a powerful chromatography data system that is easy to use The CDS-111 efficiently uses the capabilities of advanced microprocessor technology to save the chemist's time and to make it easier to quantitate analysis results. Simple controls The controls are simple and straightforward, easier to use than many hand calculators. Four switches and a small keyboard provide complete control. For example, to run a typical analysis, from injection through calculations and printed report, all you need to do is: press the "start" button, make your injection when the "ready" light comes on and, after the last peak elutes, press the compute button to get your complete report. It's that simple on the outside because the CDS-111 does so much more on the inside.
Presets handle most chromatograms For most chromatograms you don't have to program the CDS-111 at all. It has been preset at the factory so that the critical peak measuring parameters are automatically set up when you switch on the power. The presets provide initial monitoring and adjustment to instrument signal noise, detection and processing of peaks, automatic updating of peak measuring parameters if peaks become broader, perpendicular and tangent peak separation, trapezoidal baseline correction and reporting of area percent . . . all automatically!
It's easy to set and change parameters to handle unusual chromatograms Whenever you encounter an unusually complex analysis, it is easy to override the automatic preset parameters and manually set exactly the values that you need. It s p e a k s t h e l a n g u a g e of c h e m i s t r y The CDS-111 doesn't speak abstract computerese. It speaks the language of chemistry. For example, if there is no reference peak at a time when a reference peak is expected the CDS-111 doesn't vaguely say "error" and leave you guessing; it says "NORP." It is specific and understandable.
And the CDS-111 is really helpful when recalculation is required. It not only tells you if an error has occurred, it tells you what the error is so that you can easily correct it and recalculate, in most cases, without having to reinject.
"Must" peak gives extra protection To detect errors and provide extra protection for the system, the first reference peak can be designated as a "must" peak. Then, in each analysis, the "must" peak must occur within a prescribed time window and be within prescribed size limits. If the "must" peak fails to meet either of these criteria, an error is detected, a message is printed and the alarm count is incremented. If the alarm count reaches a significant level the CDS-111 can terminate the analysis. The "must" peak can detect faults or errors in all system components. It will detect incorrect flow rates, wrong detector, wrong sample, a deteriorating column, a plugged or leaking syringe, anything that causes the "must" peak to fail to meet its criteria.
It has a nine-method memory Once a method is set up, the CDS-111 will store it for instant call up. The CDS-111 will hold up to nine complete analytical methods in memory, each programmed to optimize a specific analysis and automatically control the entire chromatography system —chromatograph, automatic sampler, valving and external devices — in automatic, closed loop operation. As a result, you don't have to reprogram every time you run a different sample. You can simply call up the method file that you set up and stored the first time you ran the analysis.
The CDS-111 makes chromatography automation available to every lab It interfaces simply with both gas and liquid chromatographs. Two different basic models are available, so you can choose a system that best meets your particular needs and budget. To have a Varian technical representative contact you circle Reader Service No. 1 . For more information circle Reader Service No. 2. Varian Instrument Division, 611 Hansen Way, Box D-070, Palo Alto, California 94303
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The CDS-111 is priced to provide more performance per dollar than any other chromatography data system available today.
