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| Brand | Apure |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Category | Domestic |
| Model | A20DO-AA1 |
| Instrument Type | Online |
| Measurement Principle | Electrochemical Probe — Clark-type Polarographic |
| Measurement Range | 0.00–20.00 ppm |
| Accuracy | ±0.01 ppm |
| Resolution | 0.01 ppm |
| Stability | ≤0.02 ppm/24 h |
| Temperature Compensation | 0–100 °C (Manual / Automatic with PT1000 or NTC10K sensor) |
| Output Signals | Dual isolated 4–20 mA outputs (independently assignable to DO and temperature), max. load 500 Ω |
| Relay Outputs | Two programmable SPST relays (3 A / 250 V AC, NO contact), adjustable hysteresis |
| Power Supply | AC 220 V ±10% or DC 24 V ±10% |
| Power Consumption | ≤5 W |
| Operating Environment | 0–60 °C, ≤85% RH |
| Enclosure Dimensions | 96 × 96 × 132 mm (H × W × D) |
| Panel Cutout | 92.5 × 92.5 mm (H × W) |
| Display Language | English / Chinese (user-selectable) |
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