WAYEAL WS1801 Automated Water Sampler

Overview

The WAYEAL WS1801 Automated Water Sampler is an embedded-control-based, industrial-grade online sampling system engineered for continuous, representative, and regulatory-compliant water quality monitoring in municipal wastewater treatment plants, industrial effluent discharge points, surface water stations, and drinking water intake facilities. It operates on a programmable sequential sampling principle—integrating real-time sensor inputs (e.g., conductivity, pH, COD, NH₃-N, or flow rate) to trigger retention sampling upon parameter exceedance, while simultaneously supporting time-proportional, flow-proportional, flow-tracking, and externally controlled sampling protocols. Its core architecture features a refrigerated multi-bottle retention carousel (1–25 vials), integrated tubing purge and pre-rinse cycles, automatic line drainage post-sampling, and temperature-controlled sample preservation at 0–4 °C—ensuring sample integrity for subsequent laboratory analysis per ISO 5667-3, ASTM D3370, and EPA Method 1664 compliance requirements.

Key Features

• Multi-mode sampling logic: Programmable scheduling for fixed-interval, time-proportional, flow-proportional, flow-tracking, external signal-triggered, and RS232-command-driven sampling
• Exceedance-triggered retention: Automatically initiates sample retention when connected analyzers (e.g., COD, NH₃-N, heavy metals) report values beyond user-defined thresholds
• Refrigerated sample storage: Integrated thermoelectric cooling maintains retained samples at 0–4 °C for up to 72 hours, minimizing biological degradation and chemical volatility
• Intelligent fluid handling: Pre-sampling tube rinse cycle eliminates cross-contamination; post-sampling automatic line drainage prevents sediment accumulation and biofilm formation
• Fault-resilient operation: Built-in power-loss recovery retains all configuration parameters and resumes scheduled tasks after re-powering; supports non-volatile memory logging of up to 2000 retention events
• Secure access control: Password-protected configuration interface with role-based permission levels to meet GLP audit trail requirements
• Comprehensive event logging: Records bottle ID, timestamp, volume, sampling mode, retention mode, parallel sample ID, and associated analyzer readings (COD/NH₃-N); stores up to 1000 door-open/close and power-cycle events

Sample Compatibility & Compliance

The WS1801 accommodates standard 500 mL and 1000 mL polyethylene or glass sample bottles compliant with ISO 5667-10 and US EPA 40 CFR Part 136. Its wetted materials—including FDA-grade silicone tubing, PTFE valves, and stainless-steel pump heads—are chemically inert toward common aqueous matrices (pH 4–10, TDS ≤ 5000 mg/L). The system meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and functional safety (IEC 61508 SIL1). When deployed in regulated environments, it supports 21 CFR Part 11-compliant electronic records when paired with validated third-party data acquisition software, and its audit-ready log structure aligns with ISO/IEC 17025 documentation expectations for environmental testing laboratories.

Software & Data Management

The WS1801 communicates via isolated RS232 serial interface (optional RS485 or 4–20 mA analog input for flow integration) using ASCII-based command protocol—fully customizable per client SCADA or DCS integration needs. Local configuration is performed via backlit LCD keypad; remote operation enables full parameter read/write, manual sample initiation, system reset, and log extraction without physical access. All retention logs include UTC timestamps, digital signatures for tamper-evident traceability, and CSV-export capability for LIMS ingestion. Firmware updates are delivered via secure USB port with checksum validation to ensure integrity and version control.

Applications

• Regulatory compliance monitoring at wastewater treatment plant outfalls (e.g., NPDES permit reporting)
• Industrial pretreatment program verification for electroplating, pharmaceutical, and petrochemical dischargers
• Surface water quality assessment in rivers, lakes, and reservoirs under national ambient water quality standards
• Drinking water source protection with early-warning detection linked to online analyzers
• Research-grade longitudinal studies requiring high-fidelity temporal resolution of contaminant dynamics
• Calibration verification support for online COD/NH₃-N sensors through parallel lab analysis of retained samples

FAQ

What is the minimum and maximum sample volume per cycle?
The WS1801 supports single-sample volumes ranging from 10 mL to 1000 mL, adjustable in 1 mL increments via configuration menu.
How does the system ensure sample representativeness during variable flow conditions?
By integrating analog flow meter signals, the sampler dynamically adjusts sampling frequency to maintain mass-proportional representation—enabling true flow-weighted composite sampling per ISO 5667-6.
Is refrigeration active during transport or only during storage?
The 0–4 °C cooling function operates continuously while the instrument is powered, preserving samples throughout retention and prior to laboratory pickup.
Can the device operate unattended for extended periods?
Yes—designed for 30-day autonomous deployment with battery-backed real-time clock, non-volatile memory, and self-diagnostic routines for pump performance, temperature stability, and valve actuation.
Does the system support MODBUS RTU or other industrial protocols?
Standard RS232 ASCII protocol is provided; MODBUS RTU, Profibus DP, or custom protocol implementation is available as an engineering option upon request.