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Specifications
The EWAI AA-7090 Zeeman Atomic Absorption Spectrophotometer is an advanced analytical instrument designed for accurate elemental analysis at normal and trace concentrations. Featuring longitudinal Zeeman background correction, a transverse-heated graphite furnace, and an integrated flame and graphite furnace design, the AA-7090 supports a wide range of analytical applications in research, industrial testing, and quality control laboratories.
The instrument incorporates an advanced optical system with an 1800 lines/mm diffraction grating, a compact optical path, and automated switching between flame and graphite furnace atomization modes in less than two seconds. Its continuously adjustable magnetic field helps optimize background correction for different elements, while automated wavelength positioning, lamp selection, slit adjustment, and lamp-current optimization simplify routine operation.
The AA-7090 can analyze more than 70 elements, according to the manufacturer, and supports multiple analytical methods, including flame absorption, flame emission, graphite furnace, and hydride analysis. Its software provides calibration, concentration calculations, quality-control checks, data management, and report generation.
| Specification | AA-7090 |
|---|---|
| Instrument Type | Zeeman Atomic Absorption Spectrophotometer |
| Wavelength Range | 190–900 nm |
| Wavelength Accuracy | ±0.1 nm |
| Wavelength Repeatability | ≤ 0.05 nm |
| Monochromator | Czerny–Turner grating monochromator |
| Diffraction Grating | 1800 lines/mm |
| Blazing Wavelength | 250 nm |
| Spectral Bandwidth | 0.1, 0.2, 0.4, 1.0, 2.0 nm; automatic switching |
| Resolution | Better than 0.1 nm |
| Static Baseline Stability | ≤ 0.002 A / 30 min |
| Dynamic Baseline Stability | ≤ 0.003 A / 30 min |
| Flame Copper Characteristic Concentration | ≤ 0.02 μg/mL/1% |
| Flame Copper Detection Limit | ≤ 0.003 μg/mL |
| Flame Precision | RSD ≤ 0.45% |
| Graphite Furnace Cadmium Characteristic Amount | 0.5 × 10⁻¹² g |
| Graphite Furnace Cadmium Detection Limit | 1.0 × 10⁻¹² g |
| Graphite Furnace Temperature Range | Ambient to 2700°C |
| Maximum Graphite Furnace Heating Rate | ≥ 2500°C/s |
| Graphite Furnace Temperature Control Precision | ≤ 1% |
| Graphite Furnace Temperature Repeatability | ≤ 0.5% |
| Background Correction | Zeeman and D₂ lamp |
| Analytical Methods | Flame absorption, flame emission, graphite furnace, and hydride methods |
| Integrated Instrument Dimensions | 1000 × 610 × 580 mm |
| Weight | 150 kg |
| Power Supply | 220 V, 50 Hz, single-phase |
| Instrument Power | 500 W |
| Graphite Furnace Power | 4 kW |
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