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| Brand | Hach |
|---|---|
| Origin | USA |
| Technology | Clark-type polarographic sensor (3-electrode system: gold cathode, silver anode, Ag/AgCl reference electrode) |
| Measurement Principle | Amperometric oxygen reduction at polarized cathode |
| Output Options | 4–20 mA analog (1–2 channels), RS-232/RS-485, Profibus DPV1 (optional) |
| DO Range | 0–99.99 mg/L (ppm), 0–999.9% saturation |
| Temp Range | 0.0–100.0 °C |
| Accuracy | ±0.05% of full scale |
| Stability | ±0.05% of full scale over 30 days |
| Enclosure Rating | NEMA 4X (IP66/IP65) |
| Hazardous Area Certification | Class I, Division 2, Groups A, B, C, D, T5 (PRO-D3 model only) |
| Membrane Assembly | Integrated replaceable cartridge (pre-filled membrane & electrolyte) |
| Auto-cleaning | Optional air-pulse cleaning system |
| Compliance | CE-marked |
| Brand | Hach |
|---|---|
| Origin | USA |
| Model | LDO II |
| Measurement Principle | Fluorescence Quenching (Dynamic Luminescence Lifetime Detection) |
| Range | 0.00–20.00 mg/L (ppm) |
| Accuracy | ±0.1 mg/L (<1 mg/L), ±0.2 mg/L (≥1 mg/L) |
| Repeatability | ±0.05 mg/L |
| Response Time (t₉₀) | <60 s, (t₉₅): <90 s at 20°C |
| Temperature Compensation | Automatic, NTC 30 kΩ |
| Sensor Materials | Noryl housing, 316 stainless steel body, polybutadiene rubber sensing cap |
| Operating Temp. | 0.0–50.0°C (sensor), 0.0–100.0°C (sample) |
| Max. Cable Length | 300 m |
| Interference Resistance | Immune to H₂S, heavy metals (Pb²⁺, Cd²⁺, Cu²⁺, etc.), hydrocarbons, Cl₂, CN⁻, S²⁻, and common ions (Na⁺, Ca²⁺, NH₄⁺, NO₃⁻, SO₄²⁻, Cl⁻, etc.) |
| Analog Outputs | Dual 4–20 mA or 0–20 mA, isolated |
| Environmental Rating | IP66, -20–60°C operating, -30–70°C storage, 0–95% RH non-condensing |
| Warranty | 12 months on sensor module |
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