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| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Principle | Fluorescence Quenching (Pt-porphyrin sensor) |
| Excitation Wavelength | 470 nm |
| Emission Detection | Phase-shift analysis of red fluorescence |
| Range | 0–20 mg/L (0–20,000 ppb) |
| Accuracy | ±0.2 mg/L (0–20 mg/L), ±1 ppb + 2% (ppb range) |
| Resolution | 0.01 mg/L or 1 ppb |
| Response Time (t₉₀) | ≤30 s |
| Operating Temperature | −5 to 50 °C |
| IP Rating | IP68 |
| Submersible Depth | Up to 30 m |
| Compensation | Automatic temperature, atmospheric pressure, and salinity compensation |
| Output | RS485 (Modbus RTU), 4–20 mA analog |
| Sensor Lifetime | 1–3 years (fluorescent cap) |
| Drift | <1% per year |
| Calibration | Air-saturated water auto-calibration |
| Installation Options | Immersion, flow-through, buoy-mounted |
| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Range | 0–20 mg/L DO / 0–200% saturation |
| Accuracy | ±0.1 mg/L (0–10 mg/L), ±0.2 mg/L (10–20 mg/L) |
| Temperature Compensation | 0–60 °C (automatic) |
| Response Time (t₉₀) | ≤60 s |
| Output Signals | 4–20 mA analog + RS485 digital (Modbus RTU) |
| Power Supply | AC 220 V ±10% or DC 24 V |
| Operating Environment | 0–50 °C, ≤90% RH (non-condensing) |
| Installation Options | Submersible, Flow-through, Pipe-mount |
| IP Rating | IP68 (sensor), IP65 (transmitter) |
| Brand | YST |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Range | 0.00–20.00 mg/L DO |
| Accuracy | ±0.5% FS |
| Fluorescent Cap Lifetime | ≥12 months (typical operation) |
| Temperature Compensation | Automatic, 0–50 °C |
| Enclosure Rating | IP68 |
| Communication Interface | RS485 |
| Power Supply | AC 220 V or DC 12 V (solar-compatible) |
| User Interface | Chinese LCD, one-button calibration |
| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Principle | Fluorescence Quenching at 470 nm excitation |
| Range | 0–20 mg/L (standard), 0–50 mg/L or 0–20,000 ppb (trace) |
| Accuracy | ±0.2 mg/L (0–20 mg/L) |
| Resolution | 0.01 mg/L or 1 ppb |
| Operating Temperature | −5 to 50 °C |
| IP Rating | IP68 |
| Submersion Depth | Up to 30 m |
| Compensation | Automatic temperature, barometric pressure, and salinity compensation |
| Output Interfaces | RS485 (Modbus RTU), 4–20 mA analog |
| Response Time (t₉₀) | ≤30 s |
| Fluorescent Cap Lifetime | 1–3 years |
| Drift | <1% per year |
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