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| Brand | AOE |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | WA755 |
| Instrument Type | Benchtop Laboratory Analyzer |
| Measurement Principle | Colorimetric Method (with Predefined Reagent-Based Reaction Chemistry) |
| Wavelength Range | 190–1100 nm |
| Wavelength Accuracy | ±0.5 nm |
| Photometric Accuracy (Transmittance) | <0.5% T |
| Photometric Repeatability | <0.2% T |
| Stray Light | <0.05% T |
| Optical Stability | ±0.002 A/h |
| Display | 65K-color TFT LCD |
| Interface | USB Data Export |
| Measured Parameters | COD, Ammonia Nitrogen (NH₃-N), Total Nitrogen (TN), Total Phosphorus (TP) |
| Measurement Ranges | COD: 0.02–100 mg/L |
| NH₃-N | 0.01–30 mg/L |
| TN | 2–15,000 mg/L |
| TP | 1–10 mg/L |
| Detection Limits | NH₃-N: 0.01 mg/L |
| COD | 0.02 mg/L |
| TN | 2 mg/L |
| TP | 1 mg/L |
| Measurement Time per Parameter | NH₃-N: 15 min |
| TP | 40 min |
| TN | 50 min |
| COD | 20 min |
| Batch Capacity | 16 samples (COD/TN/TP) |
| Digestion Temperature Control | COD: 165 °C ±0.5 °C |
| TN | 122 °C ±0.5 °C |
| TP | 120 °C ±0.5 °C |
| NH₃-N | adjustable (sealed or open-mode) |
| Digestion Duration | COD/TN/TP/NH₃-N: 10–40 min (parameter-specific) |
| Digestion Mode | Sealed (TN, TP), Sealed or Open (NH₃-N, COD) |
| Calibration Curve Storage | 200 preloaded & user-defined curves |
| Data Storage Capacity | 40,000 test records |
| Compliant Standards | GB/T 11893–1989 (TP), GB/T 11894–1989 (TN), HJ 535–2009 (NH₃-N), HJ 399–2007 (COD) |
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