Feature of Atomic Absorption Spectrophotometer DW-200

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 eliminate human labor.
• A flame emission burner head can be installed to perform flame emission analysis on Alkali metals such 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.
• The 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 a sampling accuracy of 1% and reproducibility of 0.3%, realizing full 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 the flame system;
• Alarm and protection function to insufficient carrier gas and protective gas pressure, insufficient cooling water supply, and overheating in a 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 the 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.

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