KHK680VW HUANKONG Automatic VOCs Water Sampler

Overview

The KHK680VW Automatic VOCs Water Sampler is an online, flow-proportional sampling system engineered for reliable, trace-level volatile organic compound (VOC) monitoring in surface water, wastewater effluent, and drinking water distribution networks. Designed to integrate seamlessly with certified online VOC analyzers—such as purge-and-trap gas chromatography–mass spectrometry (P&T-GC-MS) or photoionization detector (PID)-based continuous monitors—the sampler ensures representative sample acquisition under conditions that minimize analyte loss, oxidation, or volatilization. Its core operational principle relies on programmable, time- or flow-triggered actuation of a peristaltic or diaphragm pump, delivering precise 40 mL aliquots into pre-evacuated, septum-capped amber glass vials. The use of amber vials mitigates UV-induced degradation of light-sensitive VOCs (e.g., benzene, chloroform, trichloroethylene), while integrated PID-controlled heating maintains sample integrity during transport or short-term holding—particularly critical for low-concentration, high-volatility compounds governed by EPA Method 524.3 and ISO 10301.

Key Features

• Programmable sampling logic supporting multiple protocols: fixed-time interval, flow-proportional (pulse input from flow meter), composite (time-weighted or flow-weighted), and event-triggered (e.g., alarm-driven sampling upon turbidity or conductivity threshold breach)
• Automated vial handling with sequential positioning of up to 24 × 40 mL amber glass vials; robotic arm or carousel-based indexing ensures repeatable, contamination-free transfer
• PID-regulated heating module (range: ambient to 40 °C ±0.5 °C) to suppress condensation and stabilize headspace equilibrium in VOC-containing samples prior to analysis
• Touchscreen HMI with intuitive graphical interface: real-time status display (pump operation, vial position, temperature, elapsed time), editable parameter entry (sampling interval, volume, start time), and on-device event log review
• Built-in non-volatile memory storing ≥10,000 sampling events with timestamp, location ID, vial number, trigger type, and error flags—fully exportable via USB or Modbus RTU/TCP
• IP65-rated enclosure with corrosion-resistant housing suitable for outdoor deployment in municipal pumping stations, industrial outfalls, and remote watershed monitoring sites

Sample Compatibility & Compliance

The KHK680VW is validated for aqueous matrices including raw surface water, treated drinking water, primary/secondary wastewater effluents, and groundwater extracts. It complies with key regulatory sampling prerequisites for VOC analysis under U.S. EPA Methods 502.2, 524.2, and 524.3, as well as ISO 5667-10 (water quality — sampling — part 10: guidance on sampling of water and steam in boiler systems) and ISO 5667-3 (preservation and handling of water samples). All wetted components—including tubing, valves, and vial septa—are certified extractables-free per USP Class VI and FDA 21 CFR Part 177 standards. The system supports GLP/GMP-aligned workflows through audit-trail-enabled data logging and user-access controls (three-tier authentication: operator, supervisor, administrator).

Software & Data Management

The embedded firmware supports native communication via RS-485 (Modbus RTU), Ethernet (Modbus TCP), and optional 4–20 mA analog output for integration into SCADA or DCS platforms. A Windows-based configuration utility enables advanced scheduling, remote diagnostics, and firmware updates. Raw sampling logs are stored in CSV format with ISO 8601 timestamps and UTF-8 encoding, compatible with LIMS import routines (e.g., Thermo Fisher SampleManager, LabWare LIMS). Optional cloud connectivity (via LTE or NB-IoT gateway) allows secure TLS 1.2–encrypted data transmission to centralized environmental data management systems, satisfying EU WFD (Water Framework Directive) reporting requirements and U.S. NPDES e-reporting mandates.

Applications

• Continuous compliance monitoring at NPDES-permitted discharge points for chlorinated solvents and BTEX compounds
• Early-warning detection in source water intakes upstream of drinking water treatment plants
• Performance verification of activated carbon or air-stripping VOC removal units
• Long-term trend analysis in watershed-scale VOC fate and transport studies
• Supporting forensic investigations of accidental spills or illicit discharges through time-resolved, chain-of-custody–documented sampling

FAQ

What VOC analytes is the KHK680VW specifically optimized to preserve?
It is validated for C2–C12 volatile halogenated hydrocarbons (e.g., vinyl chloride, tetrachloroethylene), aromatic hydrocarbons (benzene, toluene, ethylbenzene, xylenes), and selected oxygenates (MTBE, acetone), per EPA Method 524.3 preservation criteria.
Can the sampler operate unattended for extended periods?
Yes—designed for continuous operation up to 30 days with standard power supply (220 VAC) and backup battery option (72 h runtime); vial capacity and refrigeration (optional add-on) determine maximum unattended duration.
Is the system compliant with 21 CFR Part 11 for electronic records?
The base unit provides ALCOA+–aligned data integrity (Attributable, Legible, Contemporaneous, Original, Accurate); full Part 11 compliance requires optional software package with digital signatures, role-based access, and electronic audit trail.
How is sample integrity verified post-collection?
Each vial includes a unique QR-coded label; integrated barcode scanner logs vial ID at fill time; residual pressure check and headspace volume verification are supported via optional vacuum gauge module.
Does the sampler support remote calibration or diagnostic functions?
Yes—modular firmware architecture allows over-the-air diagnostics, pump performance trending, and automatic self-test routines triggered weekly or before scheduled sampling events.