WET Labs
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| Brand | WET Labs |
|---|---|
| Origin | USA |
| Model | C-Star |
| Wavelength Options | 370 nm, 470 nm, 532 nm, or 650 nm |
| Path Length | 10 cm or 25 cm |
| Receiver Acceptance Angle | 1° |
| Spectral Bandwidth | 10–12 nm (370 nm), 20 nm (470/532/650 nm) |
| Accuracy | ±0.003 m⁻¹ @ 1 Hz |
| Operating Temperature | −2 to 40 °C |
| Pressure Rating | 600 m (plastic housing), 6000 m (aluminum housing) |
| Dimensions (25 cm path) | 47 × 6.4 × 9.3 cm |
| Dimensions (10 cm path) | 29.2 × 6.4 × 9.3 cm |
| Dry Weight | 2.2 kg (plastic), 3.6 kg (aluminum) |
| In-Water Weight | 0.9 kg (plastic), 2.7 kg (aluminum) |
| Input Voltage | 7.5–15 VDC |
| Sampling Rate | 8 Hz |
| Output Interface | RS-232 |
| Brand | WET Labs |
|---|---|
| Origin | USA |
| Model | CYCLE-PO4 |
| Detection Principle | Colorimetric Analysis via LED-based Optical Absorption (Molybdenum Blue Method) |
| Wavelength | 870 nm |
| Optical Path Length | 5 cm |
| Linearity | ≥95% R² |
| Detection Limit (3σ in 18 MΩ·cm water) | ≤75 nM PO₄-P (≤0.0023 mg P/L or ≤0.0071 mg/L PO₄) |
| Measurement Frequency | Up to 2 samples/hour |
| Operating Temperature Range | 0–30 °C |
| Pressure Rating | 200 m depth (IP68) |
| Dimensions (H×W) | 56 cm × 18 cm |
| Air Weight | 6.8 kg |
| Power Input | 9.5–18 VDC |
| Data Storage | 1 GB internal flash memory |
| Interface | RS-232 serial |
| Sample Throughput | >1000 measurements per deployment |
| Autonomous Operation Duration | >3 months on typical profiling or moored duty cycle |
| Calibration | Field-deployable two-point (zero/span) optical calibration with automated drift compensation |