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| Brand | Leichi |
|---|---|
| Origin | Shanghai, China |
| Model | SJG-791 |
| Instrument Type | Online Analyzer |
| Measurement Principle | Electrochemical Amperometric Sensor |
| Measured Parameter | Free Residual Chlorine |
| Range | 0.00–20.00 mg/L |
| Accuracy | ±10% (≥0.5 mg/L) or ±0.05 mg/L (<0.5 mg/L) |
| Resolution | 0.01 mg/L (Cl₂), 0.01 pH, 0.1 °C |
| pH Range | 0.00–14.00 pH |
| Temperature Range | 0.0–60.0 °C |
| pH Accuracy | ±0.05 pH |
| Temp Accuracy | ±0.5 °C |
| Linear Error | ±3.0% FS (Cl₂) |
| Electronic Unit Stability | ±1% FS/24 h |
| 90% Response Time | 2 min |
| Enclosure Rating | IP65 |
| Power Supply | AC 220 V ±10%, 50 Hz |
| Dimensions | 166 × 166 × 110 mm |
| Weight | 2 kg |
| Output | Dual isolated 4–20 mA DC (configurable for Cl₂ or pH), RS-232/RS-485 (Modbus RTU) |
| Data Storage | 2000 records |
| Auto Compensation | pH and temperature compensated for residual chlorine measurement |
| Alarm | Configurable upper/lower limits with hysteresis |
| Power Failure Protection | Yes |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | SJG-792 |
| Instrument Type | Online Analyzer |
| Measurement Principle | Electrochemical Amperometric Sensor Method |
| Measured Parameters | Residual Chlorine, Total Chlorine |
| Range | (0.00–5.00) mg/L |
| Accuracy | ±5% (for values >1 mg/L) or ±0.05 mg/L (for values ≤1 mg/L) |
| Repeatability | ±0.025 mg/L (≤1 mg/L) |
| Resolution | 0.01 mg/L |
| Limit of Detection (LOD) | ≤0.05 mg/L |
| Display | Dot-matrix LCD |
| Data Storage | Up to 700 records with SD card export |
| Output | Isolated 4–20 mA DC (configurable span), RS-232 or RS-485 (Modbus RTU) |
| Ingress Protection | IP65 |
| Power Supply | AC (220 ± 22) V, (50 ± 0.5) Hz |
| Calibration Options | Factory pre-loaded calibration curves, manual zero + up to two-point span calibration, in-process calibration support |
| Alarm Functions | Programmable high/low concentration thresholds |
| Diagnostics | Built-in self-diagnostic system |
| Power Failure Protection | Non-volatile memory retention |
| [Brand | LeiCi |
|---|---|
| Origin | Shanghai, China |
| Model | DGB-402F |
| Instrument Type | Portable |
| Measurement Principle | DPD Spectrophotometry |
| Measurable Parameters | Residual Chlorine, Total Chlorine |
| Range | 0–5 mg/L |
| Accuracy | ±0.05 mg/L (≤1 mg/L) |
| Repeatability | ≤2.0% |
| Resolution | Concentration: 0.001 mg/L |
| Absorbance | 0.001 ABS |
| LOD | ≤0.02 mg/L |
| Wavelength | 515 nm LED |
| Calibration | 1–3 point user-defined or factory-default curves |
| Data Storage | 200 entries per parameter |
| Protection Rating | IP65 |
| Operating Temperature | 5–35 °C |
| Relative Humidity | ≤85% RH |
| Power | Rechargeable Li-ion battery |
| Dimensions | 85 × 230 × 50 mm |
| Weight | ~0.5 kg] |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | SJG-791B |
| Instrument Type | Online Analyzer |
| Measurement Principle | Electrochemical Amperometric Sensor Method |
| Measurable Parameters | Residual Chlorine / Total Chlorine / Chlorine Dioxide / Ozone (user-selectable single parameter) |
| Measurement Range | 0.005–2.000 mg/L (standard range) |
| Accuracy | ±1% FS (for residual chlorine with DCS4H-M0c electrode) |
| Resolution | 0.001 mg/L |
| Temperature Compensation | Automatic (5–40 °C sample range) |
| Output | Isolated 4–20 mA (600 Ω max load), RS-485 Modbus RTU |
| Enclosure Rating | IP65 |
| Power Supply | AC 220 V ±10%, 50 Hz |
| Installation | Wall-mounted analyzer + flow-through sensor |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | DGB-402A |
| Instrument Type | Portable Colorimeter |
| Measurement Principle | DPD Spectrophotometric Method |
| Measured Parameters | Residual Chlorine, Total Chlorine |
| Range | (0.02–3.00) mg/L |
| Accuracy | ±3% or ±0.02 mg/L |
| Repeatability | ≤1% |
| Resolution | 0.01 mg/L |
| Detection Limit | ≤0.02 mg/L |
| Light Source | 515 nm LED |
| Wavelength Accuracy | Fixed at 515 nm |
| Cuvette Size | 25 mm diameter |
| Data Storage | 200 measurement records |
| Power Supply | Rechargeable Li-ion battery |
| AC/DC adapter (Input | AC 100–240 V, Output: DC 5 V) |
| Protection Rating | IP65 |
| Dimensions (L×W×H) | 80 × 200 × 75 mm |
| Weight | 0.4 kg |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | DGB-403F |
| Instrument Type | Portable |
| Measurement Principle | DPD Spectrophotometry |
| Measurable Parameters | Residual Chlorine (LR/HR), Total Chlorine (LR/HR), Chlorine Dioxide (LR/HR), Monochloramine (LR/HR), Chlorite, Chlorate, Hydrogen Peroxide |
| Residual Chlorine HR Range | 0.20–12.0 mg/L |
| Accuracy (Residual Cl₂ HR) | ±0.1 mg/L or ±5% |
| Repeatability (Residual Cl₂ HR) | ≤1% |
| Resolution (Residual Cl₂ HR) | 0.1 mg/L |
| LOD (Residual Cl₂ HR) | ≤0.2 mg/L |
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