Can provide trace analysis of both sulphur and chlorine with one push of a button. Both elements can be measured in one sample, or each measured separately by inserting a new sample. Can measure a broad range of liquid samples from aqueous solutions to heavy hydrocarbons without the need for dilution, combustion gases or the need to change detectors, boats, injectors, furnaces etc. Based on monochromatic wavelength dispersive X-ray fluorescence, and using doubly curved crystal optics which provide high sensitivity and precision.