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| Brand | Huakeyi |
|---|---|
| Origin | Beijing, China |
| Model | HK-258 |
| Instrument Type | Portable |
| Measurement Principle | Polarographic Electrochemical Sensor |
| Measurement Range | 0.00–200 µg/L |
| Accuracy | ±0.3% FS or 1 µg/L (whichever is greater) |
| Repeatability | 0.05% |
| Detection Limit | 0.1 µg/L |
| Resolution | 0.1 µg/L, 0.01 mg/L |
| Temperature Compensation Range | 0–50 °C (manual or automatic) |
| Temperature Accuracy | ±0.5 °C |
| Temperature Resolution | 0.1 °C |
| Response Time (T90) | ≤60 s at 25 °C |
| Power Supply | Built-in 3.7 V rechargeable Li-ion battery |
| Battery Life | ≥40 h per charge |
| IP Rating | IP68 |
| Dimensions (Transmitter) | 123 mm × 86 mm × 267 mm (L×W×H) |
| Weight (Transmitter) | 1.5 kg |
| Brand | Huake Instrument |
|---|---|
| Model | HK-318 |
| Type | Online Dissolved Oxygen Analyzer |
| Measurement Principle | Polarographic (Clark-type) Electrochemical Sensor |
| Range | 0–20 µg/L, 0–200 µg/L, or 0–20 mg/L (auto-ranging) |
| Accuracy | ±1 µg/L or ±1.5% FS (whichever is greater) |
| Repeatability | ±1.5% FS |
| Detection Limit | 0.1 µg/L or 0.1 mg/L |
| Resolution | 0.1 µg/L / 0.1 mg/L |
| Response Time (T90) | ≤60 s at 25 °C |
| Temperature Compensation | 0–50 °C (automatic or manual) |
| Temp. Sensor | Thermistor |
| Temp. Accuracy | ±0.5 °C |
| Output | Dual isolated 4–20 mA (configurable as 0–10 mA or 0–20 mA), max. load 800 Ω |
| Alarm Outputs | 2 programmable relay outputs |
| Communication | RS-485, Profibus DP, HART |
| Power Supply | AC 100–240 V, 50–60 Hz |
| Power Consumption | ≤8 W |
| Enclosure | Cast aluminum, IP65-rated front panel |
| Dimensions | 146 × 146 × 154 mm (W × H × D) |
| Panel Cutout | 139 × 139 mm |
| Weight | 2 kg |
| Operating Ambient | 5–45 °C |
| Storage Temp. | −25–55 °C (electrode must be stored >0 °C) |
| Sample Requirements | 5–50 °C, flow rate 50–350 mL/min, suspended solids ≤5 µm, no colloids or oil, RH ≤90% non-condensing |
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