Atomic Absorption Spectrophotometer

DW-AAS-200 Atomic Absorption Spectrophotometer

FEATURES:

Integrated flame/graphite furnace atomization system, changeable with flame emission burner

· Automatically controlled changeover of the integrated flame and graphite furnace atomizer featuring easy operation and time saving eliminates human labor.
· A flame emission burner head can be installed to perform flame emission analysis to Alkali metals as K, Na etc.

Accurate fully automated control system
· Automatic 6-lamp turret, automatic adjustment of lamp current and optimization of light beam position.
· Automatic wavelength scanning and peak picking
· Automatic spectral bandwidth changing
· Automatic changeover between flame and graphite furnace operation,  automatic optimization of position parameters, automatic ignition and automatic gas flow setting
Reliable fully automatic graphite furnace analysis
· Adopting FUZZY-PID and dual curve mode light-controlled temperature control technique, temperature auto-correction technique, ensures fast heating, good temperature reproducibility and high analytical sensitivity.  The temperature control accuracy is less than 1%.
· Graphite furnace with pneumatic control and pressure lock ensures constant pressure and reliable contact.
· Multi-function auto sampler features automatic standard sample preparation, automatic correction of sampling probe depth, automatic tracing and correction of liquid surface height in the sample vessel, with the sampling accuracy of 1% and reproducibility of 0.3%, realizing fully automation of graphite furnace analysis.
Perfect safety protection measures
· Alarm and automatic protection to fuel gas leakage, abnormal flow, insufficient air pressure and abnormal flame extinction in flame system;
· Alarm and protection function to insufficient carrier gas and protective gas pressure, insufficient cooling water supply and over-heating in graphite furnace system.

Advanced and reliable electronic design

· Adopting large-scale programmable logic array and Inter I2C bus technology
· European type sockets and AMP adapters with high reliability to ensure long term reliability of the whole electronic system.

Easy and practical analysis software

· Easy-to-use AAS analysis software is made under Windows operating system, realizing fast parameter setting and optimization.
· Automatic sample dilution, automatic curve fitting, automatic sensitivity correction.
· Automatic calculation of sample concentration (content), mean value, standard deviation and relative standard deviation calculation.
· Multi-elements determination in sequence to the same sample.
· Measured data and final results can be printed out and edited in Excel format.

Category:

Description

SPECIFICATIONS:

Main Specification Wavelength range 190-900nm
Wavelength accuracy Better than ±0.25nm
Resolution Two spectral lines of Mn at 279.5nm and 279.8nm can be separated with the spectral bandwidth of 0.2nm and valley-peak energy ratio less than 30%.
Baseline stability 0.004A/30min
Background correction The D2 lamp background correction capability at 1A is better than 30 times.
The S-H background correction capability at 1.8A is better than 30 times.
Light Source System Lamp turret Motorized 6-lamp turret (Two high performance HCLs can be mounted on the turret to increase the sensitivity in flame analysis.)
Lamp current adjustment Wide pulse current: 0~25mA,              Narrow pulse current: 0~10mA.
Lamp power supply mode 400Hz square wave pulse;
100Hz narrow square wave pulse + 400Hz wide square pulse wave.
Optical System Monochomator Single beam, Czerny-Turner design grating monochromator
Grating 1800 l/mm
Focal length 277mm
Blazed Wavelength 250nm
Spectral Bandwidth 0.1nm, 0.2nm, 0.4nm, 1.2nm, auto switch over
Flame Atomizer Burner 10cm single slot all-titanium burner
Spray chamber Corrosion resistant all-plastic spray chamber.
Nebulizer High efficiency glass nebulizer with metal sleeve, sucking up rate: 6-7mL/min
Emission burner provided
Graphite Furnace Temperature range Room temperature~3000ºC
Heating rate    2000℃/s
Graphite tube dimensions 28mm (L) x 8mm (OD)
Characteristic mass Cd≤0.8 ×10-12g, Cu≤5 ×10-12g, Mo≤1×10-11g
Precision Cd≤3%, Cu≤3%, Mo≤4%
Detection and Data Processing System Detector R928 photomultiplier with high sensitivity and wide spectral range.
Software Under Windows operating system
Analytical method Working curve auto-fitting; standard addition method; automatic sensitivity correction; automatic calculation of concentration and content.
Repeat times 1~99 times, automatic calculation of mean value, standard deviation and relative standard deviation.
Multi-task Functions Sequential determination of multi-elements in the same sample.
Condition reading With model function
Result printing Measurement data and final analytical report printout, editing with Excel.
Standard RS-232 serial port communication
Graphite Furnace Autosampler Sample tray capacity 55 sample vessels and 5 reagent vessels
Vessel material Polypropylene
Vessel volume 3ml for sample vessel, 20ml for reagent vessel
Minimum sampling volume 1μl
Repeatable sampling times 1~99 times
Sampling system Accurate dual pump system, with 100μl and 1ml injectors.
Characteristic Concentration and Detection Limit Air-C2H2 flame Cu: Characteristic concentration ≤ 0.025 mg/L， Detection limit≤0.006mg/L;
Function Expansion Hydride vapor generator can be connected for hydride analysis.
Dimensions and Weight Main unit 107X49x58cm, 140kg
Graphite furnace 42X42X46cm, 65kg
Autosampler 40X29X29cm, 15kg

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