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| Brand | LI-COR |
|---|---|
| Origin | USA |
| Model | LI-7700 |
| Instrument Type | Online Analyzer |
| Target Gas | Methane (CH₄) |
| Measurement Precision | ±5 ppb |
| Measurement Range | 0–25 µmol/mol at −25 °C |
| Brand | LI-COR |
|---|---|
| Origin | USA |
| Model | LI-7810 |
| Instrument Type | Portable |
| Measurement Principle | Optical Feedback–Cavity Enhanced Absorption Spectroscopy (OF-CEAS) |
| Measurement Frequency | 1 Hz |
| Optical Cavity Volume | 6.41 cm³ |
| Sample Flow Rate | 250 sccm (standard mL/min) |
| Weight | 10.5 kg (including batteries) |
| Dimensions (L×H×W) | 51 × 33 × 18 cm |
| Operating Temperature | −25 °C to +45 °C (non-direct-sunlight ambient) |
| Relative Humidity Range (Operation) | 0–85 % RH (non-condensing, no direct sunlight) |
| Sample Line Humidity Range | 0–99.9 % RH (non-condensing) |
| Pressure Range | 70–110 kPa (high-altitude mode: 50–110 kPa) |
| Connectivity | Ethernet and Wi-Fi (2.4 GHz, IEEE 802.11 a/b/g/n/ac) |
| Power Consumption | 22 W @ 25 °C (steady state) |
| AC Input | 100–240 VAC, 50–60 Hz |
| DC Output | 24 VDC |
| Battery Runtime | ~8 hours with two standard batteries |
| CH₄ Range | 0–100 μmol/mol |
| CH₄ Precision (1σ) | 0.25 ppb (5-sec avg), 0.60 ppb (1-sec avg) |
| CH₄ Drift | <1 ppb per 24 h |
| CO₂ Range | 0–10,000 μmol/mol |
| CO₂ Precision (1σ) | 1.5 μmol/mol (5-sec avg), 3.5 μmol/mol (1-sec avg) |
| H₂O Range | 0–60,000 μmol/mol |
| H₂O Precision (1σ) | 20 μmol/mol (5-sec avg), 45 μmol/mol (1-sec avg) |
| CH₄ T₉₀ Response Time | ≤2 s (0 → 2 μmol/mol) |
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