In industrial production, the photoelectric direct reading spectrometer has been widely used due to its cost savings, fast analysis speed, and reliable analysis results. It has the following advantages.

(1) Using a photoelectric direct reading spectrometer for analysis, a wide range of spectral line wavelengths can be used. This range is determined by the performance of the photomultiplier tube. For example, using PMT with quartz window holes and placing the optical system of the spectrometer in vacuum, the available wavelength can be as short as 150nm. This may utilize spectral lines located in the band for analysis.

(2) The calibration curve has a wide range. Due to the strong amplification ability of PMT on signals, different amplification factors can be used for PMT with different strengths of spectral lines. The difference can reach 10000 times. Therefore, the photoelectric method can analyze many elements in the sample under the same analytical conditions. Although many elements with vastly different content ranges can be analyzed simultaneously from high to low content.

(3) The error introduced in the photosensitive plate and photometry of the spectral method is generally above 1%. The metering error of the photoelectric direct reading spectrometer can be reduced to below 0.2%. Has high accuracy. Beneficial for the analysis of high content elements in the sample, and accurate.

(4) The photoelectric direct reading spectrometer has a fast analysis speed. Generally, within 2-3 minutes of receiving the sample, more than 20 alloy elements in the steel can be measured simultaneously. It controls the smelting process, accelerates the steelmaking process, and is an effective means of energy conservation and emission reduction.

The defects analyzed by the photoelectric direct reading spectrometer include the following points.

(1) Due to the use of exit slits, it is not possible to utilize spectral lines with similar wavelengths.

(2) Due to the use of exit slits, PMT not only receives spectral lines but also background (using BKG 175.7nm background channel, the influence of background can be deducted).

(3) The position of the exit slit is fixed, and the analysis elements are limited. To change the analysis task, it is necessary to change the channel and choose another exit slit.

(4) Due to the presence of background, the analysis of trace elements is somewhat difficult.

(5) It is not an independent method, but relies on chemical analysis. Require chemical analysis to provide accurate content of standard samples for spectra, and verify the analysis results of spectra.