This is a wonderful vintage Perkin Elmer Model 112-G spectromator with interchangeable prisms. It does not have the detector or light source, so it is more technically the monochromator portion of the instrument. I am guessing it dates from the 1960's. Currently the monochromator is set up for work within the IR region of the spectrum. All the mirrors are gold-coated, and the installed prism is of Cesium Bromide. The monochromator has manual controls for both the wavelength setting and for simultaneously setting the slit width of both the entrance and exit slits.

In addition, there is an optional motor assembly attached to the wavelength-setting shaft opposite the manual control knob. There is a clutch assembly so the prism may be adjusted without engaging the gearing of the motor drive. There are two independent adjustments within the motor drive housing which appear to enable one to set travel limits and a third slide adjustment that appears to generate a marker pulse. There are a couple of extra spur gears installed on storage posts on under the motor drive housing. We do not have the control unit or cables for the motor drive portion of the spectrometer.

The entry and exit ports are arranged at right angles. There is a mitre-gear driven selector for interposing two interchangeable mirrors for directing the light flux to a position within the monochromator chamber that is currently unoccupied. No mirrors are installed in the carrier so it appears this portion was never optioned.

The instrument is in superb mechanical condition. All of the gold mirrors are covered in a colloidal protective film and I could detect no blemishes in the surfaces of them. The CsBr prism does show a very slight haze on the surface so it could do with a repolishing. The wavelength setting spindle turns very freely, as does the regulating micrometer screw for the slit width. The slit-mechanisms are works of art in themselves. Please see photos of the underside of the instrument. There is no cover installed on the underside of the monochromator. The finish of the instrument does show some modest signs of use, but they are minor. The entry and exit ports have no detectors or light sources installed.

Please inquire regarding alternative prism availability.

Photo set 1736