SKC Vac-U-Chamber Vacuum Sampling Chamber

Overview

The SKC Vac-U-Chamber Vacuum Sampling Chamber is a rigorously engineered passive gas sampling system designed for quantitative, contamination-free collection of airborne volatile organic compounds (VOCs), inorganic gases, and other reactive or trace-level analytes in occupational, environmental, and emergency response settings. Unlike conventional active sampling methods where sample gas passes through the pump—introducing potential adsorption, catalytic degradation, or lubricant carryover—the Vac-U-Chamber operates on a true vacuum-fill principle: an external air sampling pump evacuates the chamber, creating negative pressure that draws ambient air directly into an inert sampling bag without contacting any pump components. This physical separation ensures sample integrity by eliminating pump-induced artifacts, making it especially suitable for sensitive analyses requiring high-fidelity preservation of chemical speciation (e.g., EPA Method TO-15, ASTM D5466, ISO 16017-1). The chamber’s rigid polypropylene body maintains structural stability under full vacuum, while its transparent polycarbonate viewing window enables real-time visual confirmation of bag inflation and seal integrity.

Key Features

• Inert sample pathway: All wetted surfaces—including internal tubing, ports, and bag interfaces—are constructed from fluoropolymer-lined or ultra-low-permeability materials (e.g., PTFE, FEP, and certified Tedlar® film) to prevent adsorption, permeation, or catalytic interaction with VOCs, sulfur compounds, or halogenated species.
• Modular port configuration: Three standardized 1/4-inch OD Swagelok-compatible ports enable flexible integration—sample inlet (for connection to sorbent tubes, diffusion samplers, or source ducts), purge vent (for pre-sampling evacuation of residual air), and vacuum fill port (for connection to AirChek® XR5000 or equivalent personal sampling pumps).
• Vacuum-rated mechanical integrity: Chamber walls are reinforced to withstand repeated full-vacuum cycles (≤100 mbar absolute) without deformation, collapse, or seal failure—validated per ASTM D6196 Annex A3 for vacuum integrity retention over ≥24 hours.
• Scalable volume options: Four certified chamber/bag combinations support methodologically appropriate sample volumes: Mini (1 L), Standard (8 L), Large (10 L), and X-Large (25 L), each calibrated and traceable to NIST-traceable standards.
• Pump protection architecture: Eliminates direct sample contact with pump internals—extending pump service life, reducing maintenance frequency, and ensuring compliance with OSHA Technical Manual Section II: Chapter 2 requirements for pump-free sampling in hazardous atmospheres.

Sample Compatibility & Compliance

The Vac-U-Chamber is validated for use with SKC-certified sampling bags—including Tedlar® (polyvinyl fluoride), Pro FlexFilm™ (multi-layer fluoropolymer), FlexFoil PLUS™ (aluminum-laminated barrier), and standard FlexFoil™—each independently tested for extractables, permeation rates (per ASTM D8197), and compatibility with GC-FID, GC-MS, and FTIR analysis. It supports adherence to multiple regulatory frameworks: EPA Compendium Method TO-15 (VOCs in ambient air), ASTM D5466 (determination of total hydrocarbons), ISO 16017-1 (indoor air—sampling using sorbent tubes and bags), and OSHA Method 1007 (formaldehyde). When used with GLP-compliant documentation and audit-trail-enabled pumps (e.g., AirChek XR5000 with optional data logger), the system meets FDA 21 CFR Part 11 requirements for electronic records in regulated industrial hygiene programs.

Software & Data Management

While the Vac-U-Chamber itself is a hardware-only passive device, its integration into compliant workflows relies on companion instrumentation with traceable data capture. When paired with SKC AirChek XR5000 sampling pumps equipped with the optional Bluetooth-enabled Flow Logger (Model FL-200), users obtain time-stamped flow rate logs, cumulative volume calculations, and pump runtime metrics—all exportable in CSV or PDF format for inclusion in chain-of-custody records. Data files support metadata tagging (operator ID, location, sampling duration, bag lot number) and can be archived within LIMS platforms compliant with ISO/IEC 17025:2017 Clause 7.5.2 (data control). No proprietary software is required; raw flow logs are compatible with standard spreadsheet and statistical analysis tools.

Applications

• Industrial hygiene monitoring: Collection of workplace VOCs (e.g., benzene, toluene, xylene, chlorinated solvents) during process audits, leak detection, or exposure assessment per NIOSH Manual of Analytical Methods (NMAM) Chapter 2541.
• Indoor air quality (IAQ) investigations: Integrated sampling of building emissions, off-gassing from construction materials, or mold-related volatile metabolites without pump interference.
• Hazardous waste site characterization: Grab sampling of landfill gas, soil vapor, or fugitive emissions prior to laboratory analysis per EPA SW-846 Method 18.
• Emergency response & fire investigation: Rapid deployment for post-incident air sampling in confined spaces or after chemical releases—compatible with NFPA 1994 Class 3 ensemble protocols.
• Method development & validation: Reference-grade sample collection for calibrating online sensors, validating sorbent tube breakthrough studies, or benchmarking passive sampler performance.

FAQ

Can the Vac-U-Chamber be used with non-SKC sampling bags?
Yes, provided the bag features a compatible 1/4-inch OD polypropylene or stainless steel inlet fitting and demonstrates documented low-permeability and low-extractable performance for target analytes (e.g., certified Tedlar® from other ISO 17025-accredited suppliers). However, SKC does not validate performance or provide calibration support for third-party bags.
Is the chamber suitable for sampling corrosive gases such as HCl or Cl₂?
Only when used with FlexFoil PLUS™ or Pro FlexFilm™ bags, which incorporate aluminum barrier layers and fluoropolymer inner linings validated for low permeation of acidic and oxidizing gases per ASTM D8197 Class A specifications. Tedlar® alone is not recommended for prolonged exposure to strong oxidizers.
Does the Vac-U-Chamber require calibration?
No—its function is volumetric displacement, not measurement. Volume accuracy is certified at time of manufacture per ISO/IEC 17025-accredited dimensional metrology. Users must verify bag integrity and chamber seal before each use per ASTM D6196 Section 7.2.
How is chain-of-custody maintained during transport?
Each chamber includes tamper-evident locking latches and optional bag-seal verification labels. When combined with SKC’s Chain-of-Custody Logbook (Cat. No. 226-01) and temperature/humidity data loggers (e.g., HOBO UX100-003), full forensic traceability is achievable per ISO/IEC 17025:2017 Clause 7.6.
Can the same chamber be reused across multiple sampling events?
Yes—provided it undergoes visual inspection for cracks or seal degradation, is cleaned with inert solvent (e.g., methanol) followed by nitrogen purge, and passes a vacuum hold test (≤5 mbar pressure rise over 15 minutes) prior to reuse. SKC recommends replacement after 500 vacuum cycles or visible wear.