How to improve the accuracy of direct reading spectrometer?

Direct reading spectrometer has a very good application in the control of off-furnace composition. In specific applications, its convenient, fast and accurate detection characteristics have played an important role in improving the quality of molten steel and energy conservation and emission reduction.

How to improve or maintain the analysis accuracy of direct reading spectrometer has always been the focus of our discussion. Preparing the analyzer in advance is indispensable to improving the detection accuracy.

1. Normal power-on of direct reading spectrometer

If the direct reading spectrometer is restarted after a long power outage, the performance of the optical components inside the instrument will take at least 48 hours to stabilize. During this period, the analysis will often affect the accuracy of the analysis results. Therefore, for the direct reading spectrometer, it should be powered on 24 hours a day. Before starting the analysis work every day, check the power-on status of the direct reading spectrometer and whether the light source indicator, power indicator, and high-voltage indicator are all on.

2. Maintain the purity of argon

The direct reading spectrometer requires the purity of argon to be 99.999%. The argon pressure input to the direct reading spectrometer is 0.5MPa. If the purity of argon does not meet the requirements, an argon gas purifier must be used to purify the argon to meet the requirements.

3. Do a good job of slit scanning

The internal optical system of the spectrometer is particularly sensitive to temperature changes. Changes in ambient temperature will cause slight changes in the optical components, so that the spectral line cannot be completely aligned with the corresponding exit slit. This drift will affect the accuracy of the analysis. Perform a slit scan once a day so that the spectral line can fall at the center of the exit slit.

4. Do a good job of standardization

Standardization is the main part of spectral analysis control. Irregular and tiny physical changes in the direct reading spectrometer will cause the working curve to drift, affecting the accuracy of the analysis. The resulting standardization can correct and calculate this drift, adjust the physical changes that affect the measurement value of the direct reading spectrometer, and ensure the accuracy of the analysis data. Be particularly careful when doing standardization. Before the initial excitation of each sample, carefully check whether its number is the same as the number prompted on the computer screen of the direct reading spectrometer. In addition, the standardized samples should have uniform composition, a flat and clean surface, and the grinding samples should have textures; the analysis gap and sample rack should be clean, and the analysis spacing should be correct.

In summary, in order to maintain the accuracy of direct reading spectrometer analysis, doing a good job of preparation before instrument analysis is the main work to improve the accuracy of direct reading spectrometer analysis.