GC-Mass Spectrometer Perkin Elmer Turbomass Mass range: upto 620 amu; Programmable pneumatic control for carrier gas flow regulation; NIST Mass spectra library Separation/identification of organic compounds and molecules; EI, CI modes of operation. GC-MS mainly consists of a regular Perkin Elmer Auto System XL Gas Chromatograph and final stage as mass spectrometer. Mass spectra is useful to confirm the atomic structure of known compound by comparing the achieved spectra with standard data. Probable structure of unknown compound can be predicted when results of GC-MS, IR and NMR are combined. It is very sensitive instrument, and can detect upto PPM level masses. The mass range is 20-620 Da, which allows analysis over a wide range of low and high molecular weight compounds.