SDL WQMS-900 Fixed Online Water Quality Monitoring System
| Brand | SDL |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Origin | Domestic (China) |
| Model | WQMS-900 |
| Price | USD 1.4M (FOB Beijing) |
Overview
The SDL WQMS-900 Fixed Online Water Quality Monitoring System is an integrated, standards-compliant environmental monitoring platform engineered for continuous, unattended operation at permanent surface water monitoring stations—including river cross-sections, lake and reservoir sampling points, and drinking water source protection zones. Built upon a modular architecture centered on certified analytical instruments, the system implements real-time measurement using standardized physicochemical and spectrophotometric methods aligned with GB/T 32205–2015, HJ 91.2–2022, and ISO 5667 series protocols. Its core operational principle combines automated wet-chemistry analysis (e.g., colorimetric determination of NH₃-N, TP, TN, CODMn) with electrochemical (pH, DO, conductivity) and optical (turbidity, chlorophyll-a, phycocyanin) sensing—enabling trace-level detection, multi-parameter synchronization, and long-term data integrity under field conditions. Designed for regulatory-grade deployment, the WQMS-900 supports national water environment assessment frameworks and fulfills key requirements for ecological supervision, early-warning response, and compliance reporting under China’s “Blue Sky & Clear Water Protection Campaign.”
Key Features
- Modular, expandable configuration supporting up to 9 mandatory parameters plus customizable “X” modules (e.g., heavy metals via ICP-MS or ASV, microbial toxicity via bioluminescence assay)
- Full-cycle automation: programmable sampling (timed/intelligent), auto-calibration (zero/span checks), self-cleaning (ultrasonic + chemical flush), and fault diagnostics with event logging
- Robust environmental hardening: IP65-rated enclosure; corrosion-resistant 316L stainless steel and PTFE-wetted components; integrated surge protection (IEC 61000-4-5 Level 4), EMI shielding (EN 61326-1), and anti-fouling flow path design
- Comprehensive quality control: automated 24-hour zero/span drift verification, spike recovery testing, duplicate sample analysis, and on-demand preservation of representative samples in refrigerated (4 °C) auto-samplers
- Redundant power management: dual-input AC/DC compatibility with integrated UPS (≥30 min hold-up) and voltage stabilization circuitry
- Unified hardware interface: standardized RS-485/232, Modbus TCP, and 4–20 mA analog outputs for seamless integration into SCADA, DCS, or third-party EMS platforms
Sample Compatibility & Compliance
The WQMS-900 is validated for raw surface water matrices—including turbid river water (up to 1000 NTU), eutrophic lake/reservoir samples (Chl-a ≤ 200 µg/L), and low-conductivity source water (10–2000 µS/cm). All onboard analyzers comply with national standard methods: NH₃-N (HJ 535–2009), TP (GB 11893–1989), TN (HJ 636–2012), CODMn (GB 11892–1989), and pH/DO/conductivity/turbidity per JJG series metrological verification regulations. The system meets GLP-aligned operational documentation requirements—including audit trails for calibration events, maintenance logs, and QC result storage—and supports 21 CFR Part 11–compatible electronic signatures when deployed with optional secure authentication modules.
Software & Data Management
Embedded Linux-based controller runs SDL’s proprietary WQ-OS v3.2 firmware, featuring embedded web server access (HTTPS), local SD card logging (≥12 months at 1-min resolution), and dual-path data transmission via 4G LTE (primary) and Ethernet (backup). Data packets conform to HJ 212–2017 communication protocol for direct upload to provincial/municipal environmental monitoring centers. Optional cloud dashboard (SDL AquaView™) provides real-time KPI visualization, anomaly detection (statistical process control charts), automated report generation (PDF/Excel), and configurable alerting (SMS/email) based on user-defined thresholds or method-specific uncertainty bands.
Applications
- Regulatory compliance monitoring at national/state-controlled river section stations (e.g., Yangtze River Basin Monitoring Network)
- Drinking water source protection zone surveillance with early warning capability for nutrient surges or algal bloom precursors
- Long-term trophic status assessment in lakes and reservoirs through synchronized Chl-a, phycocyanin, TP, TN, and Secchi depth correlation
- Baseline data acquisition for environmental impact assessments (EIA) and post-remediation verification studies
- Integration into smart watershed management systems leveraging time-series analytics and hydrological model coupling
FAQ
Does the WQMS-900 support remote firmware updates and diagnostic troubleshooting?
Yes—via secure SSH or HTTPS session; all updates undergo cryptographic signature validation prior to installation.
What is the minimum required site infrastructure for installation?
A level concrete foundation (≥2 m²), stable AC 220 V ±10% power supply, potable water source for cleaning, and cellular signal strength ≥–95 dBm (or fiber/Ethernet alternative).
How does the system handle high-sediment or biofouling-prone water?
Through multi-stage prefiltration (100 µm stainless mesh + 10 µm cartridge), periodic ultrasonic transducer activation (every 2 hrs), and programmable acid/oxidant backflush cycles.
Is third-party instrument integration possible?
Yes—via Modbus RTU/TCP or analog I/O; SDL provides documented register maps and protocol conformance test reports.
What data security measures are implemented?
TLS 1.2 encryption for data transmission, AES-256 encryption for stored logs, role-based access control (RBAC), and tamper-evident audit logs compliant with ISO/IEC 27001 Annex A.8.2.3.
