Xonteck Model 906 Automated VOC Sampler

Overview

The Xonteck Model 906 Automated VOC Sampler is a microprocessor-controlled, programmable environmental sampling system engineered for high-fidelity collection of volatile organic compounds (VOCs) from ambient air in field-deployed and fixed-site monitoring applications. It operates in strict compliance with U.S. EPA Compendium Method TO-11A (for sorbent tube sampling) and TO-14/TO-15 (for canister-based sampling), enabling trace-level quantification of C₂–C₁₂ hydrocarbons, oxygenates, halocarbons, and other priority VOCs in regulatory air quality monitoring programs. The instrument employs a dual-path architecture—supporting simultaneous sampling to both evacuated stainless-steel Summa canisters and thermally desorbable sorbent tubes—while maintaining precise isothermal flow conditions throughout the sampling train. Its integrated thermal management system ensures stable internal cabinet temperature (±0.5 °C over −10 °C to 45 °C ambient), critical for minimizing analyte breakthrough and adsorption artifacts during extended deployments.

Key Features

• Four independent canister ports and two sorbent tube channels—expandable to additional canister positions via optional manifold kits
• Integrated 5.7-inch TFT color touchscreen with LED backlight (320 × 240 resolution), supporting intuitive menu navigation and real-time parameter visualization
• Porter201-series mass flow controllers (MFCs) with full-scale accuracy of ±1% and linearity error < ±0.5%, available in standard ranges of 0–20, 0–50, or 0–100 sccm (custom calibrations supported)
• ADB161 stainless-steel diaphragm pump delivering up to 7.6 L/min at 23.0 inHg vacuum; coupled with Swagelok SS pressure regulators (3–50 psig adjustable range) for precise backpressure control
• Corrosion-resistant wetted path constructed entirely from electropolished 316 stainless steel, PTFE (Teflon®), and Viton® elastomers—validated for inertness per EPA TO-15 Appendix A requirements
• Automated pre-sampling purge cycle to eliminate residual contamination prior to sample acquisition
• Uninterruptible operation: auto-resume function restores scheduled sampling sequences after power interruption, preserving time-stamped event logs
• Ethernet port (RJ45) and RS-232 interface for remote configuration, data export, and external trigger input (TTL-compatible)

Sample Compatibility & Compliance

The Model 906 is validated for use with EPA-certified 6-L and 1-L electro-polished stainless-steel Summa canisters (NIST-traceable calibration standards compatible) and common multi-bed sorbent tubes (e.g., Tenax TA/Carbograph 1TD/Carboxen 1000). All gas pathways meet EPA Method TO-15 material compatibility criteria for low-part-per-trillion (pptv) detection limits. The system supports GLP-compliant audit trails through timestamped operational logs, including flow setpoints, actual measured flow, canister pressure, cabinet temperature, pump status, and error codes—all stored internally and exportable via Ethernet. Firmware complies with NIST SP 800-53 security controls for environmental data acquisition systems and aligns with ISO/IEC 17025 requirements for sampling equipment used in accredited laboratories.

Software & Data Management

Embedded firmware provides deterministic real-time scheduling with up to 99 programmable sampling events per day, each configurable for duration, flow rate, start delay, and post-sample purge. Data are logged at 1-second intervals to non-volatile memory with CRC-32 checksum validation. Export formats include CSV and XML, compatible with EPA’s AirData, AQS, and third-party LIMS platforms. Optional secure remote access is enabled via HTTPS-enabled web interface (TLS 1.2+), supporting role-based user authentication and 21 CFR Part 11–compliant electronic signatures when paired with external certificate authorities. Audit trail records retain immutable timestamps, operator IDs, and change history for all parameter modifications.

Applications

• Ambient air monitoring networks (e.g., EPA Photochemical Assessment Monitoring Stations – PAMS)
• Source emission characterization at industrial facilities under NSPS and MACT compliance protocols
• Indoor air quality (IAQ) investigations in commercial buildings and schools
• Soil vapor intrusion assessments requiring temporal resolution of VOC plume dynamics
• Method validation studies supporting ASTM D5466 (standard test method for VOCs in ambient air by canister sampling)
• Mobile monitoring campaigns using vehicle-mounted configurations (optional shock-isolated mounting kit available)

FAQ

Does the Model 906 support both canister and sorbent tube sampling simultaneously?
Yes—its dual-path architecture allows concurrent sampling to up to four Summa canisters and two sorbent tubes within a single acquisition cycle, with independent flow control per channel.

What pressure units does the digital sensor support, and what is its resolution?
The integrated pressure transducers display readings in both inHg and psig with 0.1-unit resolution across the full scale (−30 to +30 inHg; 0 to 30 psig).

Is the instrument suitable for unattended operation in extreme ambient temperatures?
It is rated for continuous operation between −10 °C and +45 °C ambient; the internal heating system maintains cabinet temperature above dew point to prevent condensation on critical components.

Can the flow controller be recalibrated in the field?
Field recalibration requires NIST-traceable reference flow standards and is performed via service-mode access; routine verification using certified soap bubble meters is recommended per EPA guidance.

What communication protocols are supported for integration into SCADA or central monitoring systems?
Modbus TCP over Ethernet and ASCII command sets over RS-232 enable seamless integration with industrial control systems and telemetry gateways.