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| Brand | Lihero |
|---|---|
| Model | LFS-2002 (NO₂) |
| Measurement Principle | N-(1-Naphthyl)ethylenediamine Dihydrochloride Spectrophotometry (ISO 6775, APHA 4500-NO₂⁻ B) |
| Wavelength | 540 nm ± 2 nm |
| Detection Range | 0–1.0 mg/L NO₂⁻-N (extendable to 0–5.0 mg/L with dilution) |
| Detection Limit | ≤ 0.005 mg/L NO₂⁻-N |
| Accuracy | ±5% of reading or ±0.01 mg/L (whichever is greater) |
| Repeatability | RSD ≤ 3% |
| Sample Volume | 10–50 mL |
| Digestion | High-temperature (120°C), high-pressure sealed digestion module |
| Turbidity & Color Compensation | Real-time dual-wavelength optical correction |
| Calibration Modes | Zero check, span check, standard verification, curve auto-calibration, spike recovery test |
| Data Logging | Internal SD card + RS485/Modbus RTU + optional 4G/ETH remote upload |
| Operating System | Embedded Linux (real-time kernel) |
| Power Supply | 220 VAC ±10%, 50 Hz |
| IP Rating | IP65 (enclosure) |
| Compliance | GB/T 32203–2015, HJ 537–2009, ISO 6775:1984, APHA Standard Methods 4500-NO₂⁻ B |
| Brand | Lihero |
|---|---|
| Model | LFS-2002 (LAS) |
| Measurement Principle | Methylene Blue Active Substances (MBAS) Spectrophotometric Method |
| Wavelength | 650 nm ± 2 nm |
| Optical Path | 10 mm quartz cuvette or flow cell |
| Detection Range | 0.05–2.00 mg/L LAS (as MBAS) |
| Resolution | 0.01 mg/L |
| Repeatability | ≤ ±2.0% RSD |
| Calibration | Automatic 2-point calibration with standard reference solutions |
| Cleaning | Programmable automatic rinsing cycle using deionized water |
| Communication Interfaces | RS-232, RS-458, RJ-45 Ethernet |
| Operating System | Real-time embedded Linux |
| Compliance | GB/T 7494–1987, ISO 7875-2:1987, ASTM D2330–18 |
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