EFFORTLESS INFRAREDS

It's almost impossible to get a bad spectrum with our new X99 series of infrared spectrophotometers. And it's almost unnecessary for the oper­ator to do any work.

The X99 spectrophotometers are the first medium priced IR instruments with microcomputers and integrated scan controls.

Quick and easy With the microcomputer controlling the recorder and optical systems, you can display the monochromator frequency continuously to 0.1 cm-' on the digital readout.

And with the integrated scan con­trols, you select a single parameter (scan time, slit setting or relative noise) and the instrument automatic­ally sets the other two. The only other

requirement is to set the gain, using Perkin-Elmer's simple Auto-Chek® system.

The X99 instruments also give you resolution to 0.5 cm-'. Ordinate scale expansion is continuously variable in both linear absorbance and percent transmission, in discrete steps from 0.1 to 10X. You can quanti-tate directly on the chart, get more information from microsamples, or reveal spectral information at low transmission values. Abscissa expan­sion is standard to 20X in discrete steps.

Choose from three models The Model 599 has a range of 4000 to 200 cm-'; Model 399, 4000 to 400 cm-'; Model 299, 4000 to 600 cm-'. To eliminate excess time and data, the 599's microcomputer lets you cut off scans at 600 or 400 by

Microcomputer controlled

simply setting a switch. Regardless of the model you

choose, you can set to any wave-number in less than 45 seconds or obtain a survey scan in only 3 min­utes. They all have built-in service diagnostics — the microcomputer can check abscissa circuits and monitor recorder and optical moving parts.

Find out how simple and accurate infrared can be with the new X99 series. Call your Perkin-Elmer repre­sentative or write Perkin-Elmer Corp., Mail Station 12, Main Ave., Norwalk, CT 06856.

Perkin-Elmer also offers the industry's largest line of infrared accessories. Ask for our accessories catalog L-396.

PERKIN-ELMER CIRCLE 176 ON READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 49, NO. 4, APRIL 1977 · 449 A