To the top SOLAS Function SOLAS Analyzing SOLAS Installation Applications

Analysis The SOLAS device analyzes the collected sample with the help of an XRF-analyzer. An isotope source (e.g. Fe 55) or a x-ray tube excites the sample with its x-rays and the spectrum is taken with energy-dispersive detector . From this spectrum up to eight element-contents can be determined (elements from Al to U). After the measurement is finished - which takes between 30 to 90 seconds depending on the application - the sample is locked out of the analyzer measuring chamber. The measuring chamber is washed with air and the next sample, which has been collected in the meantime, is filled into the measuring chamber. The acquired data are sent to the data-storage and process-visualizing-system via glass fiber. Breaks in hauling, were no samples must be taken, are used by the analyzing-device for self-calibration with an incorporated standard-material.
Data-Processing The process-data acquisition computer provides graphic representation of the received analytical data and can be installed up to several miles apart.
The system (COROS by Siemens) provides data-storage of both analytical data and technical information regarding the performance of SOLAS. It allows the quick recognition of trends, gives an alarm in case given limited values are passed over etc. At the end of a shift-protocol with all analysis-data and shift-mean values is given. all working conditions of the SOLAS-system as well as possible defects or mal-functions are shown in a clear manner.
Longtime-Stability At the end of the calibration for the particular task a set of synthetic standard-samples is measured, which allows a checking/review of the XRF-analyzer's stability at any time. In case of a defect the original calibration can be restored.
Calibration The calibration of the system is usually done by presenting samples with known contents to the sampling tube of the device. The range of contents should cover the whole range of values in which the device is supposed to operate. During the calibration the intensities determined by the XRF-analyzer (counts per seconds for a chemical element) are related to the laboratory data for the material. In most cases simple linear functions between the intensities of the chemical element in question and the content in the bulk material are found. 
 
 

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Revised:
2009-03-06