The invention relates to the field of physico-chemical methods of analysis, in particular to infrared spectroscopy for determining the composition of mixtures of petroleum products. A spectral oil analyzer is proposed that contains an infrared radiation source connected to a power source, a parabolic reflector, a sampler consisting of two plane-parallel plates, with an oily mixture sample, a collimator connected to the receiving end of a fiber optic assembly consisting of quartz fibers, while the output the end of the fiber-optic assembly is divided into optical channels having an equal number of fibers, at least one channel being a reference, the ends of the optical channels are connected through optical filters to photodetectors, the output of which receives an electrical signal to obtain its image on the display screen after computer processing characterized in that the end of the fiber-optic assembly is divided into eleven optical channels connected to eleven photodetectors through eleven optical filters, respectively, the three optical channels being reference, and the optical fiber assembly It contains fibers made of silver halide, and the ratio of quartz fibers to silver halide fibers is 1: 2 and their total amount is not less than 110, while two plane-parallel plates of the sampler are made of synthetic diamond. The proposed spectral oil analyzer allows you to determine the quantitative content of sulfur-containing compounds in the oil mixture in the flow control mode by increasing the sensitivity of the device.
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