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| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | PHG-21C, PHG-21D |
| Measurement Range | pH (0.00–14.00), ORP (−1800–+1800 mV), Temperature (−10.0–120.0 °C) |
| Resolution | 0.01 pH, 1 mV, 0.1 °C |
| Accuracy | ±0.05 pH, ±10 mV, ±1.0 °C |
| Repeatability | ≤0.02 pH, ≤3 mV |
| Input Impedance | ≥1 × 10¹² Ω |
| Input Current | ≤2 × 10⁻¹² A |
| Stability | ≤±0.02 pH/24 h |
| Output | Isolated 4–20 mA DC (configurable span) |
| Enclosure Rating | IP65 |
| Power Supply | AC 220 V ±10 %, 50 Hz ±1 Hz or DC 24 V |
| Dimensions | 144 × 144 × 163 mm |
| Weight | 2.5 kg |
| Key | Brand: Leici |
|---|---|
| Model | PHG-7685A |
| Measurement Range | 0.00–14.00 pH |
| Resolution | 0.01 pH |
| Accuracy | ±0.05 pH ±1 digit |
| Temperature Range | −10.0–120.0 °C |
| Temp. Resolution | 0.1 °C |
| Temp. Accuracy | ±0.5 °C (0.0–60.0 °C), ±1.0 °C (others) |
| Repeatability | 0.02 pH |
| Electronic Unit Error | ±0.03 pH ±1 digit |
| Stability | ≤±0.02 pH/24 h |
| Input Impedance | ≥1×10¹² Ω |
| Input Current | ≤2×10⁻¹² A |
| Output | 4–20 mA isolated analog output, RS-232 or RS-485 (user-selectable) |
| Enclosure Rating | IP65 |
| Power Supply | AC 220 V ±10 %, 50 Hz ±1 % |
| Dimensions | 628 × 288 × 224 mm |
| Weight | 10 kg |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | PHG-217C, PHG-217D |
| Measurement Range | pH (0.00–14.00), ORP (−1800–+1800 mV), Temperature (−10.0–120.0 °C) |
| Resolution | 0.01 pH, 1 mV, 0.1 °C |
| Accuracy | pH ±0.05 pH ±1 digit, ORP ±10 mV, Temp ±1.0 °C |
| Input Impedance | ≥1 × 10¹² Ω |
| Input Current | ≤2 × 10⁻¹² A |
| Stability | ≤±0.02 pH/24 h |
| Output | Isolated 4–20 mA DC (configurable span), RS-232 or RS-485 (user-selectable), 4 control relays |
| Data Storage | 400 records with programmable interval |
| Auto Calibration | Supports recognition of pH 4.00, 6.86, and 9.18 buffers |
| Temperature Compensation | Automatic (NTC or Pt100 sensor input) |
| Enclosure Rating | IP65 |
| Power Supply | AC 220 V ±10%, 50 Hz ±1% |
| Dimensions | 144 × 144 × 163 mm |
| Weight | 2.5 kg |
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