Junray ZR-3520 Vacuum Chamber Gas Bag Sampler (Model A: 4 L | Model B: 8 L)

Overview

The Junray ZR-3520 Vacuum Chamber Gas Bag Sampler is a field-deployable, single-channel passive gas sampling instrument engineered for high-fidelity collection of ambient, stack, or indoor air samples into flexible gas-impermeable sampling bags. It operates on the principle of vacuum-driven passive filling: a sealed, evacuated chamber houses the sampling bag; when the internal chamber pressure drops below ambient, sample gas flows into the bag without mechanical pumping interference—eliminating active flow-induced turbulence, pressure pulsation, or adsorptive losses common in diaphragm-pump-based systems. This method ensures quantitative recovery of volatile organic compounds (VOCs), sulfur-containing species (e.g., H₂S, SO₂), halogenated hydrocarbons, and other reactive or low-concentration gaseous analytes sensitive to surface interaction or thermal degradation. Designed for compliance with U.S. EPA Method TO-14A, TO-15, and ISO 16017-1 for VOC sampling, the ZR-3520 supports both grab and integrated sampling protocols across environmental monitoring, occupational hygiene, emergency response, and laboratory method validation workflows.

Key Features

• Vacuum chamber architecture enables true zero-cross-contamination sampling: no shared gas path between sequential samples; each bag is isolated within its own pressure-controlled environment.
• Integrated bag purge-and-fill valve system allows full residual gas displacement and subsequent sample draw using a single front-panel rotary selector—no tubing disconnection or manual reconfiguration required.
• Chemically inert fluidic pathway constructed from PTFE-lined stainless steel, perfluoroalkoxy (PFA) tubing, and EPDM-free sealing materials to prevent analyte adsorption, catalytic decomposition, or leaching.
• Dual-power operation: AC adapter input (100–240 VAC, 50/60 Hz) and rechargeable high-capacity lithium-ion battery (≥8 h runtime at 1.0 L/min, typical), certified to UN 38.3 and IEC 62133 standards.
• Onboard digital flowmeter with real-time display, adjustable setpoint control, and automatic flow drift compensation algorithm to maintain ≤±5% stability over 60 minutes under variable backpressure conditions.
• Compact, ruggedized chassis (IP54-rated enclosure) with ergonomic carry handle and fold-down instrument stand for stable bench or field deployment.

Sample Compatibility & Compliance

The ZR-3520 is validated for use with standard 4 L and 8 L aluminum-laminated Tedlar® (polyvinyl fluoride) or FEP-coated gas sampling bags meeting ASTM D6196-22 specifications. It accommodates both pre-evacuated and ambient-pressure bag configurations. All wetted components comply with USP Class VI biocompatibility requirements and are compatible with EPA Compendium Method TO-15 calibration gases (e.g., methane, benzene, trichloroethylene). The instrument’s flow control architecture satisfies data integrity requirements under ISO/IEC 17025:2017 for accredited testing laboratories and supports audit-ready operation per GLP and GMP Annex 11 principles. Optional NIST-traceable flow calibration certificate available upon request.

Software & Data Management

While the ZR-3520 operates as a standalone hardware platform, optional Bluetooth-enabled data logger module (ZR-DL200) provides time-stamped flow records, vacuum cycle logs, battery status, and operator ID tagging. Logged data exports in CSV format compliant with LIMS ingestion protocols and meets FDA 21 CFR Part 11 requirements for electronic records when paired with Junray’s validated desktop configuration utility (v3.2+). All firmware updates are delivered via secure HTTPS endpoint and digitally signed to ensure integrity and version traceability.

Applications

• Ambient air monitoring for VOCs, ozone precursors, and odorants in urban, industrial, and landfill perimeter zones.
• Occupational exposure assessment in semiconductor fabrication, paint spraying, and chemical handling facilities per OSHA Method 1007 and NIOSH Method 1501.
• Stack emission testing for regulated pollutants (e.g., formaldehyde, acetaldehyde) where thermal desorption GC-MS analysis is employed.
• Indoor air quality investigations in schools, hospitals, and residential buildings following AIHA RP-1200 guidelines.
• Emergency response triage sampling during chemical spills or hazardous material releases per NFPA 472 protocols.
• Method development and interlaboratory comparison studies requiring matrix-matched, non-pressurized reference gas standards.

FAQ

What gas bag volumes are supported?
The ZR-3520 is configured for two nominal capacities: Model A accepts 4 L gas bags; Model B supports 8 L bags. Both use standardized 1/4″ Swagelok-compatible inlet ports and accommodate bags with integrated quick-connect fittings.
Can the instrument be used for sampling corrosive or high-humidity gases?
Yes—provided the sampling bag material is chemically matched (e.g., FEP-laminated bags for HF or Cl₂; humidity-resistant laminates for >90% RH). The PFA/PTFE gas path resists corrosion up to 120 °C and 100% RH, but condensate must be removed upstream using a Nafion™ dryer or chilled impinger.
Is flow calibration traceable to national standards?
Factory calibration uses a primary-standard dry calibrator (NIST-traceable, ±0.5% reading). End-user verification kits—including a portable electronic bubble meter and certified reference flow restrictors—are available as accessories.
How is battery life affected by flow rate and ambient temperature?
At 2.0 L/min and 25 °C, battery endurance is ~4.5 h; at 0.5 L/min and 15 °C, it extends to ≥9 h. Low-temperature performance is maintained down to –10 °C using the optional thermal insulation sleeve.
Does the ZR-3520 meet CE or UKCA marking requirements?
Yes—the device complies with EU Directive 2014/30/EU (EMC), 2014/35/EU (LVD), and RoHS 2011/65/EU. UKCA marking is valid for Great Britain market placement through Junray’s appointed UK Responsible Person.