Annuo GAS-3519 Bag-Type Automated Gas Sampler for GC

Overview

The Annuo GAS-3519 Bag-Type Automated Gas Sampler is a dedicated, high-reliability autosampling system engineered for unattended, trace-level gas analysis by gas chromatography (GC). It employs quantitative loop injection—a precise, pressure-driven sampling method—where gaseous samples are drawn from flexible gas-tight sampling bags or syringes into thermally controlled stainless steel or PEEK quantitative loops, then transferred to the GC inlet under reproducible flow and timing conditions. Designed specifically for environmental monitoring, industrial hygiene, landfill gas analysis, and ambient air quality testing, the GAS-3519 eliminates manual handling of volatile organic compounds (VOCs), hydrocarbons, methane, and other permanent gases—minimizing operator exposure, reducing carryover risk, and ensuring analytical continuity across extended batch runs. Its modular architecture supports scalable deployment in regulated laboratories requiring compliance with EPA Method TO-14/TO-15, HJ 38–2017, ISO 16017-1, and ASTM D5504.

Key Features

• Modular sample carousel design: Base configuration supports 16 positions; up to six 12-position expansion modules can be added, enabling full-system capacity of 88 sample locations without mechanical recalibration.
• Thermally regulated quantitative loop: Heatable from ambient to 150 °C to prevent condensation and adsorption of polar or high-boiling analytes (e.g., C₃–C₆ alkanes, formaldehyde).
• Dual-mode sampling interface: Each port independently accepts either gas-tight Tedlar® or aluminum-laminated sampling bags (500 mL or 1 L) or glass/gas-tight syringes (up to 100 mL), enabling method flexibility without hardware reconfiguration.
• Independent line purge capability: Programmable inert gas (N₂ or He) purging for each sampling path prior to draw, eliminating cross-contamination between high- and low-concentration samples.
• High-integrity fluidic pathway: All wetted components—including valves, loops, and transfer lines—are constructed from PTFE or PEEK; valve bodies use PEEK housings with polyimide (PI) rotor seals, rated for >500,000 switching cycles.
• Integrated vacuum-assisted sampling: Built-in diaphragm pump delivers up to 6 L/min flow rate and achieves –55 kPa vacuum, ensuring rapid, complete bag evacuation even at low ambient pressures.
• Intelligent over-range protection: Real-time signal monitoring detects elevated hydrocarbon or methane signals; triggers automatic GC oven ramp, column bake-out, and system hold—preventing column overload and preserving retention time stability.
• Multi-protocol I/O interface: RS-232, USB 2.0, and Ethernet ports support both hardware trigger (TTL/relay) and software-controlled synchronization with Agilent, Thermo Fisher, Shimadzu, PerkinElmer, and domestic GC platforms.

Sample Compatibility & Compliance

The GAS-3519 accommodates standard gas sampling media compliant with EPA and Chinese environmental standards: 500 mL and 1 L multi-layer laminated gas bags (ASTM D6159), glass syringes with Luer-lock septa, and certified pre-evacuated canisters (when used with optional adapter kit). Its gas-handling design meets GB/T 16157–1996 and HJ 38–2017 requirements for VOC and total hydrocarbon sampling integrity. The system’s firmware enforces audit-trail logging of all critical events—including loop fill time, purge duration, injection timestamp, and temperature setpoints—supporting GLP/GMP workflows and FDA 21 CFR Part 11-compliant data governance when paired with validated laboratory information management systems (LIMS).

Software & Data Management

The included Windows-based control software provides intuitive graphical setup for sample mapping, sequence definition, loop volume selection, and thermal profile scheduling. Users define up to eight calibration standard points with arbitrary concentration values; the software auto-generates bracketed calibration curves and calculates R² statistics in real time. All acquisition parameters—including draw time (0–99 s), equilibration delay (0–99 s), purge duration (up to 600 s), and inter-sample interval (up to 999 min)—are programmable per position. Raw event logs and instrument status snapshots are exported in CSV or XML format, compatible with third-party statistical packages and electronic lab notebooks (ELNs). No cloud dependency or vendor-specific runtime is required.

Applications

• Regulatory emission monitoring: Continuous stack testing per EPA Method 25A and HJ 38–2017 for total hydrocarbons and methane in refinery, petrochemical, and biogas facilities.
• Ambient air quality networks: Unattended multi-point sampling for BTEX, aldehydes, and ozone precursors using passive or active bag collection protocols.
• Landfill and wastewater treatment plant surveys: High-throughput screening of CH₄, CO₂, H₂S, and NMHCs across spatially distributed sampling points.
• Method validation and QC: Precision assessment via repeated injections (n = 10) yields RSD <0.5% for FID response on total hydrocarbon and methane columns—exceeding performance thresholds in ISO 8573-5 and USP .
• Research-grade gas standard preparation: Onboard dilution and mixing functions enable dynamic generation of multi-level calibration standards directly from primary reference gases.

FAQ

What GC interfaces does the GAS-3519 support?
It provides native TTL-level start/stop triggering, analog voltage output for GC ready status, and bidirectional serial communication (RS-232) for full command-and-control integration with major GC manufacturers.
Can the system handle humid or particulate-laden gas streams?
Yes—optional inline particulate filters (0.5 µm PTFE) and Nafion™ dryers can be installed upstream of the sampler inlet; dew point suppression below –20 °C is achievable with integrated loop heating.
Is remote monitoring possible?
Ethernet connectivity enables secure remote access via VNC or LabVIEW-based SCADA environments; no proprietary remote desktop software is required.
How is calibration verification performed?
The system includes a dedicated “calibration check” mode that injects a known standard at user-defined intervals and logs peak area deviation against baseline reference values—generating automated pass/fail reports.
What maintenance is required for long-term operation?
Annual valve seal replacement and quarterly loop cleaning with methanol/acetone are recommended; pump diaphragms are rated for ≥12 months continuous service under typical environmental sampling loads.