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A​A900 Atomic Absorption Spectrophotometer

• The instrument has a motorized 8 hollow cathode lamp turret which allows the automatic positioning and optimization of each hollow cathode lamp by the software
• The control of the gas flows for the fuel gas (C2H2) of the burner is also carried out directly from the software thus allowing optimization of the instrument for the analytical parameters for the selected analysis
• Two methods of background correction are available. The first utilizes a Deuterium Arc lamp and the second is the proven method of Self  Reversal
• High precision minimal optics ensures maximum light throughput to the computer controlled Czerny-Turner Monochromator
• The spectral bandwidth is automated and is available with a choice of five slit sizes
• The electronic parameters for the photomultiplier tube detector, the hollow cathode lamp current and the balancing of the absorbance and background energies are controled from the software
• the ignition of the flame is computer controlled and the various safety interlocks offer a very safe operation system

​Safety

• ​The flame conditions are continuously monitored, and should the flow rates change an audible alarm sounds
• The pressure of the support gas (oxidant) is monitored constantly. If the pressure changes then the flow of the fuel gas will be stopped and the flame will be safely extinguished
• A sensor monitors the level of liquid in the drain and will prevent ignition if too low. The flame will also be extinquished if the level in the drain changes significantly
• A flame sensor monitors the flame and safely turns off the gas flow to the burner if the flame suddenly extinquishes
• The burner is identified by a switch making it impossible to light without the burner being fitted
• An emergency flame off button is installed in case a problem is observed. the flame can be extinquished safely

Graphite Atomizer Features

• In the AA990G instrument, the graphite furnace head is fixed into the light path so alignment with the optical path is simple and accurate
• In the AA990FG instrument the graphite furnace head is fixed behind the flame atomize assembly and is motorized into position by a simple operation in the AAWin software. The positions for the flame and graphite are saved ,making it easy to swap between modes for different analysis
• The temperature of the transversely heated graphite tube is accurately controlled by means of a precision feedback system and has been designed to reduce analytical problems normally associated with this type of technique
• Pyrolytically coated graphite tubes are used as standard and are manufactured to improve performance as well as increase the analytical life
• Platform graphite tubes are supplied as standard and will accept volumes up to 20ul. Non-platform graphite tubes are also available as an optional extra
• Up to 10 heat stages are available for the programming of the graphite atomizer. These can set and stored within the AAWin software
• The graphite tube is efficiently cooled ay an additional water circulation system (supplied separately)

• ​Auto sampler
• Hydride system
• Voltage stablizer
• Air compressor
• Deuterium lamp
• Photomultiplier tube
• Hollow cathode lamp
• Glass nebulizer
• Acid resistant nebulizer