The problems of calibration and verification of spectrophotometer optical-electronic measuring channel used in spectral pyrometry of radiating particles heterogeneous flows are considered. A technique of device calibration utilizes radiation spectrums of standard sources registered by the spectrophotometer. At initial (the first) stage this technique provides a high precision estimation of an instrument function of measuring channel distortions and correction of reference temperature values for standard radiation sources. At the second stage the instrument function of measuring channel distortions is applied for evaluating parameters of tungsten model representation of its relative spectral emissivity given for reference temperature points in scientific papers. The correction of control temperature values of the reference lamp (TRU 1100- 2350) on the first stage is conducted with the ε (λ,T) model. In other words, a calibration of the reference lamp control temperature values is performed.