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| Brand | LI-COR |
|---|---|
| Origin | USA |
| Model | LI-7825 |
| Instrument Type | Stable Gas Isotope Ratio Analyzer |
| CO₂ Measurement Range | 50–2000 ppm |
| CO₂ δ¹³C Precision | <0.5 ‰ (1-s avg), <0.04 ‰ (5-min avg) @ 400 ppm |
| CO₂ δ¹⁸O Precision | <0.1 ‰ (5-min avg) @ 400 ppm |
| CO₂ δ¹⁷O Precision | <0.4 ‰ (5-min avg) @ 400 ppm |
| NH₃ Measurement Range | 0–30,000 ppm |
| NH₃ Precision | 2 ppb (1-s avg) @ 300 ppb |
| H₂O Range | 0–60,000 ppm |
| Measurement Technique | Optical Feedback–Cavity Enhanced Absorption Spectroscopy (OF-CEAS) |
| Measurement Frequency | 1 Hz |
| Cavity Volume | 6.41 cm³ |
| Sample Flow Rate | 250 sccm (70 sccm with low-flow accessory) |
| Operating Temperature | −25 °C to +45 °C |
| Operating Humidity | 0–85 % RH (non-condensing, no direct sunlight) |
| Power Consumption | 22 W @ 25 °C |
| Weight | 10.5 kg (with battery) |
| Dimensions (L×H×W) | 51 × 33 × 18 cm |
| Connectivity | Ethernet & Wi-Fi (2.4 GHz, 802.11 a/b/g/n/ac) |
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