Abstract

Multicomponent plant streams requiring continuous analysis are sometimes encountered which for various reasons cannot be handled by the nondispersive analyzer. In such cases the laboratory-type infrared spectrometer may be used, but this requires air-conditioned space and environmental control often impractical in a plant. This paper describes a small spectrometer, enclosed in an explosion-proof box of internal dimensions, 11 in. ×13 in. ×7 in., which has successfully solved a difficult plant control problem. Within the box are radiation source, cell for the continuously flowing liquid sample, radiation chopper, and the optical system which employs a 60° NaCl prism with faces 75 mm×60 mm. A separate box of similar size houses the amplifier. A standard strip-chart recorder and pneumatic controller completes the equipment. Continuous analysis of one of the stream components is used to control a distillation column.

© 1953 Optical Society of America

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