Chromium Online Water Quality Analyzer
>>Overview This monitor operates autonomously under long-term unattended continuous operation based on field configurations. It is widely applicable to
industrial pollutant discharge wastewater, industrial process
wastewater, industrial sewage treatment plants, municipal sewage
treatment plants, and similar scenarios. Depending on the
complexity of on-site testing conditions, optional preprocessing
systems can be integrated to ensure reliable testing processes, accurate results, and compliance with diverse operational demands.
>>Principle The product employs the diphenylcarbazide spectrophotometric method for total chromium detection. After mixing the water sample with
a strong oxidizing agent, trivalent chromium (Cr³⁺) is oxidized to
hexavalent chromium (Cr⁶⁺). In an acidic environment with an
indicator present, Cr⁶⁺ reacts with the indicator to form a colored
complex. The monitor detects this color intensity change, converts
it into total chromium concentration values, and outputs the
results. The amount of colored complex generated corresponds to the
total chromium concentration.
>>Technical Parameter | Test Method | Diphenylcarbazide Spectrophotometric Method | | Measuring Range | 0~5mg/L (segmented measurement, expandable) | | Detection Limit | ≤0.02mg/L | | Resolution | 0.001mg/L | | Accuracy | ±5% | | Repeatability | ≤±5% | Drift (24h) | Zero drift: ±5% Span drift: ±10% | | Measurement Time | <50min (digestion time adjustable) | | Measurement Modes | Adjustable time interval, fixed time point, or triggered
measurement | Calibration Modes | Automatic calibration (1~99 days adjustable) Manual calibration based on actual water samples | Maintenance Cycle | 1 month per session; ~30min per maintenance
| | Human-Machine Interface | Touchscreen display and command input | Self-Diagnosis & Protection | Self-diagnoses operational status; retains data during
anomalies/power outages Automatically clears residual reactants and resumes operation after
reset/power recovery | | Data Storage | 5-year data capacity | | Input Interface | Digital input | Output Interfaces | 1× RS232, 1× RS485 2× 4~20mA analog outputs | Operating Environment | Indoor use; recommended temperature: 5~28℃, humidity ≤90%
(non-condensing) | Power Supply | Voltage: AC 220±10% V Frequency: 50±0.5 Hz Power: ≤150W (excluding sampling pump) | Dimensions | 520H × 370W × 265D (mm) |
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