ARL 9900 series

The Thermo F45 universal goniometeris an alternative when additional crystalsare required for specific applications. Up totwo universal goniometers can be fitted.Both goniometers provide high qualitysequential X-ray spectrometry as a result ofthe detector and crystal being positionedrapidly with great precision by microprocessorsusing Moiré fringe technology.The 5th generationMoiré fringegoniometerThis design bringsseveral important advantages:• Fast positioning – a slewing speed of upto 4800˚ 2θ/min is five times faster thana conventional goniometer and betweenten and twenty times faster than ascanner.• Automatic alignment of the θ/2θ angularrelationship between crystal and detector– the alignment is performedelectronically by the microprocessor andno mechanical adjustments are needed.• Rapid qualitative analysis – continuousdigital scanning allows fast acquisitionof spectra at speeds up to 320˚/minute.Peak identification is automatic.• No wear, no performance degradation –the absence of gears, hence of friction,makes them ‘no wear’ systems assuringexcellent angular reproducibility(< ± 0.0002°) and precision (0.001°).• High accuracy of peak positions (eg 0.01°with LiF crystal) – analytical peaks arefound exactly in their theoreticalpositions, a performance up to ten timesbetter than conventional systems.• Independent rotation of crystal anddetectors allows two detectors to bemounted side by side. Secondarycollimators in front of each detectoroptimize count-rate or resolution.• When specialized applications requirespecific crystals, up to nine of them canbe fitted on the universal goniometerallowing the analyst to choose the bestcrystal for each region of the X-rayspectrum. Up to four primary collimators(fine, medium, coarse, extra coarse) areavailable in order to optimize resolutionor intensity.Both goniometers offer full capability forthe analysis of non-routine elements. Theycan back up any of the fixed channels andprovide semi-quantitative analysis whencoupled to appropriate software packages(e.g. QuantAS and Uniquant ® with theuniversal goniometer or OptiQuant withthe SmartGonio).Power supplyA choice to suit the applicationARL 9900 series instruments can bespecified with integrated high frequencysolid-state generator of various powers tobest suit each application.• ARL 9900 Oasis – 1200 W power supplycooled with its own independent circuit, thusavoiding the need of external water cooling.• ARL 9900 XP – 3.6 kW power supplywhich will suit most applications wherelow limits of detection and highperformance is required. The maximumoutput for this generator is 60 kV (70 kVoptional), maximum current is 120 mA.• ARL 9900 XP+ – up to 4.2 kW forthose applications requiring ultimateperformance. Two types of powersupply can be chosen– 60 kV, current up to 120 mA (standard)– 70 kV, current up to 140 mA (optional).Full microprocessor controlPutting the emphasis on reliabilityand ease of useFull digital control makes the ARL 9900series easy to use. It also ensuresconsistent results over many operations.The microprocessor architecturecomprises clusters of microprocessors,microcontrollers and digital signalprocessors connected by full duplex links.They control the overall operation of theinstrument, monitor several hundred statuspoints every few seconds and direct thegoniometer(s), diffraction system andmonochromator functions.The analyst’s instructions are processedin the master microprocessor and sent to theappropriate cluster. The resulting analyticaldata is displayed on the video screen. Forconvenience, current operations can befollowed on a synoptic panel.Goniometerprinciple ofoperation