WDXRF instruments are, on average, more mechanically complex and the XRF tubes are considerably more expensive than XRD tubes. Wavelength Dispersive instruments use vacuum and a helium atmosphere in order to detect lighter elements. They include many feed throughs that require o-rings and seals that inevitably wear causing leaks and premature failure of expensive vacuum pumps. Most employ many position sensors that can fail and cause motion collisions with the many turrets, carousels, attenuators, filters, detectors, and other components. The flow proportional detectors require a very delicate and expensive ultra thin window that holds the P10 gas within from escaping into the vacuum chamber. WDXRF instruments come with a higher purchase price tag as well as much higher maintenance costs. Omni can help you keep your WD machine operating as well as advise you when selecting a replacement instrument new or used. Before you buy either, contact us and let us help you navigate the process.
EDXRF is a far less expensive spectrometer than the WD version. It is much smaller, lighter, and with far fewer moving parts. It can perform a spectrum acquisition far quicker than its WD cousin, and the annual maintenance cost is a small fraction of the that of the WD. The drawback is its elemental range and resolution. Also, its concentration precision is not as high as the wavelength machine. However, if the lightest elements are not of interest and close element overlap is not a concern, then EDXRF could be the right instrument for you. Of course you won’t be able to detect concentrations down to 10ppm, but if your requirements are less stringent, then a tabletop inexpensive EDXRF machine is for you. Omni offers new EDXRF instruments and well as used. Contact us to discuss the options for your application.
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