Xonteck Model 924 Toxic Air Sampler

Overview

The Xonteck Model 924 Toxic Air Sampler is a field-deployable, unattended ambient air sampling system engineered for regulatory-compliant collection of airborne toxicants—including hexavalent chromium (Cr(VI)), carbonyl compounds, volatile organic compounds (VOCs), and respirable particulate matter—prior to laboratory analysis. It operates on the principle of controlled volumetric aspiration using calibrated mass flow control, enabling trace-level quantification in accordance with U.S. EPA Methods IO-3.3, IO-4.3, TO-15, TO-17, and OSHA Method ID-250. Designed for continuous outdoor deployment, the system integrates environmental resilience with metrological traceability, supporting long-term monitoring campaigns across industrial fence lines, remediation sites, and urban air quality networks.

Key Features

• Modular architecture comprising independent control unit, pump enclosure, weatherproof housing, and interchangeable sampling head assemblies—facilitating rapid configuration changes and field serviceability.
• Multi-channel sampling capability: supports up to four simultaneous sampling trains—including 37 mm or 47 mm membrane filters (for Cr(VI) or PM analysis), impinger-based carbonyl collection, thermally desorbable sorbent tubes (e.g., Tenax®, Carbopack™), and pressurized canisters (for VOCs per EPA TO-15); note: only one canister port is active per deployment.
• Corrosion-resistant construction: stainless steel chassis (304/316 grade) with brass fluid-path components, rated for NEMA 4X outdoor exposure and extended operation in coastal or chemically aggressive environments.
• Integrated human-machine interface: 5.7-inch TFT color touchscreen (320 × 240 pixels, white LED backlight) co-located with embedded industrial PC and thermal printer—enabling real-time status monitoring, method parameter entry, and on-device report generation without external computing hardware.
• Active thermal management: 100 W silicone rubber heater and forced-air cooling fan maintain internal electronics within operational limits (–20 °C to +50 °C ambient), validated per IEC 60068-2-1 and IEC 60068-2-2 environmental test standards.
• Dual-voltage power input (115 VAC/60 Hz or 220 VAC/50 Hz selectable) with surge suppression and EMI filtering compliant with FCC Part 15 Class B and CE EN 61000-6-3.

Sample Compatibility & Compliance

The Model 924 accommodates standardized sampling media recognized by major regulatory frameworks: 37/47 mm PTFE or mixed-cellulose ester (MCE) filters for metal speciation (per OSHA ID-250 and NIOSH 7600); DNPH-coated silica gel cartridges for aldehydes/ketones; stainless steel or electropolished canisters (SUMMA®-treated) for VOC preservation; and multi-bed sorbent tubes for semi-volatile organics. All flow paths are inert-certified (SilcoNert® or Sulfinert®-treated) to prevent analyte adsorption or catalytic degradation. System validation includes documented calibration traceability to NIST SRMs, pressure decay leak testing per ASTM D6537, and flow accuracy verification against primary standards per ISO 5725-2.

Software & Data Management

Firmware supports programmable sampling schedules (start/stop times, flow ramping, duty cycling), automatic data logging at user-defined intervals (minimum 1-second resolution), and encrypted CSV export via USB or RS-232. Audit trails record all operator actions, parameter modifications, and alarm events with timestamps and user IDs—fully compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed under GLP or GMP protocols. Optional remote telemetry (cellular or Ethernet) enables secure cloud-based data aggregation and centralized fleet monitoring.

Applications

• Regulatory compliance monitoring for Cr(VI) emissions near chrome plating facilities (per California AB 2287 and EPA MACT Subpart N).
• Workplace exposure assessment for formaldehyde, acetaldehyde, and other carbonyls in manufacturing and laboratory settings.
• VOC source apportionment studies using canister-based whole-air sampling paired with GC-MS analysis.
• Long-term ambient air toxics surveillance under the National Air Toxics Assessment (NATA) framework.
• Post-remediation verification sampling at brownfield sites contaminated with chlorinated solvents or PAHs.

FAQ

How many sampling channels can operate simultaneously?
The Model 924 supports up to four concurrent sampling trains; however, only one pressurized canister port is available per unit. Additional filter, impinger, or sorbent tube channels may be configured in parallel.
Is the system certified for use in hazardous locations (Class I, Division 1)?
No—the Model 924 is rated for general-purpose outdoor use (NEMA 4X) but does not carry UL/CSA explosion-proof certification. For classified areas, consult Xonteck’s ATEX/IECEx-compatible variants.
What maintenance intervals are recommended for the Gast pump and mass flow controllers?
Gast 1023-series pumps require oil replacement every 500 operating hours; Porter MFCs should undergo annual recalibration using certified reference gases and secondary flow standards.
Can the system log temperature and pressure alongside flow data?
Yes—integrated Honeywell RTD sensors and digital vacuum transducers provide synchronized environmental metadata logged at the same frequency as flow measurements.
Does the firmware support custom method programming beyond preloaded EPA protocols?
Yes—advanced users may define custom flow profiles, alarm thresholds, and data export templates via the onboard configuration utility, subject to validation documentation per ISO/IEC 17025 requirements.