Hach ES-6910 Automated Water Sampler

Overview

The Hach ES-6910 Automated Water Sampler is an engineered solution for regulatory-compliant, unattended water sampling in wastewater discharge monitoring, industrial effluent control, and environmental surveillance applications. Designed to meet stringent Chinese environmental standards—including HJ/T 372-2007 (Technical Requirements and Test Methods for Automatic Water Samplers), HJ 493-2009 (Sample Preservation and Management), HJ 91.1-2019 (Technical Specifications for Wastewater Monitoring), and HJ 35X-2019 series—the ES-6910 integrates precision fluid handling with robust environmental data governance. It operates on a dual-path architecture: centralized sampling combined with distributed pre-treatment, enabling true sample integrity through physical separation of intake, conditioning, and storage functions. The system supports both discrete (single-bottle) and composite (time- or flow-weighted) sampling protocols, and includes parallel dual-sample capability—critical for audit-ready chain-of-custody compliance where duplicate samples are mandated by supervisory authorities.

Key Features

• Refrigerated sample preservation at 4 ± 2 °C across all 24 × 1 L polyethylene bottles, minimizing microbial activity and chemical degradation during holding periods.
• Electronically secured access control with configurable user permissions (static or dynamic door-locking options), supporting role-based authentication aligned with GLP/GMP operational frameworks.
• Full sample path isolation: electrically isolated power and hydraulic circuits prevent cross-contamination; tubing materials comply with USP Class VI and FDA 21 CFR Part 177 requirements.
• Self-cleaning sample line functionality via programmable air purge and reverse-flush cycles, ensuring representative sampling across variable matrix viscosities and particulate loads.
• Integrated flow interface accepting standard 4–20 mA analog signals from ultrasonic, magnetic, or turbine flow meters—enabling real-time flow-proportional sampling with automatic recalibration based on flow rate changes.
• Modular hardware design allows field replacement of core components (e.g., YZ2515 peristaltic pump, CR18-8DN level sensor, DS18B20 temperature probe) without system downtime.

Sample Compatibility & Compliance

The ES-6910 accommodates aqueous matrices ranging from clarified municipal effluents to high-solids industrial wastewaters (up to 15% suspended solids). Its 1 L PE bottles (USP Class VI certified) resist leaching and UV degradation, while the dark-colored bottle rack ensures light-sensitive analytes (e.g., nitrate, chlorophyll-a, certain pesticides) remain stable. All sampling sequences—including time-triggered, flow-triggered, event-driven (e.g., pH or conductivity excursions), and remote-commanded cycles—are timestamped and logged with metadata (flow rate, ambient temperature, bottle ID, valve position). Data records conform to ISO/IEC 17025 documentation requirements and support traceability under EPA Method 1664, ASTM D5176, and China’s Ministry of Ecology and Environment (MEE) audit protocols.

Software & Data Management

The ES-6910 operates via embedded firmware with local LCD interface and RS-485/Modbus RTU communication for integration into SCADA or EMS platforms. Optional Hach DataSuite™ software enables remote configuration, historical log review, alarm management (email/SMS alerts on sampling failure, temperature deviation, or door breach), and export of CSV- or XML-formatted reports compliant with MEE’s national data upload specifications. Audit trails include full change history for all parameter modifications, user login/logout events, and sample sequence execution logs—meeting FDA 21 CFR Part 11 electronic record and signature requirements when deployed with validated server infrastructure.

Applications

• Regulatory wastewater discharge monitoring at municipal WWTP influent/outfall points, lift stations, and industrial park outfalls.
• Process water quality verification in petrochemical, pharmaceutical, food & beverage, and semiconductor manufacturing facilities.
• Long-term trend analysis in automated water quality monitoring stations (WQMS), particularly where composite sampling reduces analytical cost without compromising statistical representativeness.
• Enforcement sampling during environmental inspections, supporting evidentiary chain-of-custody with tamper-evident bottle sealing and dual-sample generation.
• Calibration verification of online analyzers (e.g., COD, NH₃-N, TP sensors) through synchronized grab sampling.

FAQ

What regulatory standards does the ES-6910 comply with?

The ES-6910 is designed and verified against HJ/T 372-2007, HJ 493-2009, HJ 91.1-2019, and HJ 35X-2019 series standards issued by China’s Ministry of Ecology and Environment.
Can the ES-6910 operate in outdoor environments?

Yes—it is rated IP54 for dust and splash resistance, and its thermal management system maintains stable refrigeration performance across ambient temperatures of –10 °C to +45 °C.
Is remote firmware update supported?

Firmware updates require local USB or serial connection; however, configuration changes, sampling schedules, and diagnostic queries can be performed remotely via Modbus TCP or Hach DataSuite™.
How is sample representativeness ensured during high-flow conditions?

The system uses dynamically adjusted aspiration velocity and real-time flow feedback to maintain consistent sample draw rates, while reverse-flush cycles clear residual matrix between cycles.
Does the ES-6910 support integration with third-party flow meters?

Yes—any 4–20 mA output flow meter meeting NEMA-4X enclosure rating and HART/Modbus compatibility can be interfaced without additional signal conditioning.