STT EQ-STT-5000 Portable Gas Chromatograph for Benzene Series Analysis
| Brand | STT |
|---|---|
| Origin | Beijing, China |
| Manufacturer | STT Senfu Technology |
| Model | EQ-STT-5000 |
| Detection Limit | 0.1 ppb (benzene) |
| Weight | 2.2 kg |
| Dimensions | 267 × 197 × 308 mm |
| Column | Microfabricated GC column with 10.6 eV PID detector |
| Power | Built-in rechargeable battery (>9 h operation) |
| Carrier Gas | Ambient air (filtered via activated carbon + molecular sieve) |
| Measurement Range | 0.1–300 ppb or 50 ppb–10 ppm (benzene) |
| Accuracy | ±1% FS |
| Sample Matrices | Air, water (with optional headspace module), soil (with optional thermal desorption unit) |
Overview
The STT EQ-STT-5000 is a field-deployable, micro-electromechanical systems (MEMS)-based portable gas chromatograph engineered for rapid, on-site qualitative and quantitative analysis of volatile organic compounds (VOCs), with primary application focus on benzene, toluene, ethylbenzene, xylenes (BTEX), trichloroethylene, tetrachloroethylene, and over 100 additional target analytes. It operates on the principle of capillary gas chromatography coupled with a 10.6 eV photoionization detector (PID), enabling selective ionization of aromatic and unsaturated VOCs while minimizing interference from saturated hydrocarbons and common background gases. Designed for compliance with GB/T 18883–2022 Annex C.3 (Portable GC Method for Indoor Air Quality), U.S. EPA Methods 5035 (VOCs in Soil and Water by Purge-and-Trap GC/PID) and 8021B (Aromatic Hydrocarbons by GC/PID), the instrument delivers laboratory-grade resolution in a handheld platform suitable for indoor air quality surveys, vehicular cabin assessments, environmental emergency response, and industrial hygiene monitoring.
Key Features
- MEMS-integrated micro-GC architecture enabling full chromatographic separation in <10 minutes without external computing hardware
- Integrated pre-concentrator module optimized for trace-level BTEX detection down to 0.1 ppb (0.0003 mg/m³) in ambient air
- Self-contained carrier gas system utilizing filtered ambient air—activated carbon removes ambient VOCs; molecular sieve eliminates moisture—eliminating need for compressed gas cylinders
- High-resolution MEMS column capable of separating critical isomers including o-, m-, and p-xylene, as well as ethylbenzene and styrene
- Touch-enabled LCD display with real-time chromatogram visualization, peak integration, and direct concentration readout in ppb or µg/m³ units
- Ruggedized aluminum-magnesium alloy housing rated IP54 for dust and splash resistance, validated for continuous operation at 10–40 °C and 20–90% RH (non-condensing)
Sample Compatibility & Compliance
The EQ-STT-5000 supports direct analysis of gaseous samples (ambient, indoor, or stack air) via integrated sampling pump and heated inlet line. With optional accessories—including a solid-phase microextraction (SPME) interface, headspace autosampler module, and thermal desorption tube adapter—the system extends compatibility to aqueous and solid matrices per EPA Method 5035 and ISO 16017-1. All analytical workflows adhere to Good Laboratory Practice (GLP) data integrity requirements, with audit-trail enabled method storage, user access control, and time-stamped result export (CSV/Excel). Instrument calibration protocols align with ISO/IEC 17025:2017 clause 7.7, and measurement uncertainty estimation follows EURACHEM/CITAC Guide CG4. The system is compatible with regulatory reporting frameworks under China’s HJ 644–2013 and U.S. EPA Region 4 VOC monitoring guidelines.
Software & Data Management
Onboard firmware includes embedded chromatographic data system (CDS) supporting automatic peak detection, retention time locking, multi-point calibration curve generation, and internal standard correction. Raw chromatograms and processed results are stored with full metadata (operator ID, GPS coordinates, temperature/humidity logs, battery level). Data export occurs via USB-C or Bluetooth 5.0 to Windows/macOS platforms. Optional STT-ChromLink desktop software provides advanced reporting templates compliant with ISO 14001 environmental management documentation and FDA 21 CFR Part 11 electronic record requirements—including digital signatures, version-controlled methods, and immutable audit trails.
Applications
- Indoor air quality assessment per GB/T 18883–2022 and WHO Guidelines for Indoor Air Quality
- Rapid source identification during chemical spills, refinery leaks, or landfill emissions events
- Occupational exposure monitoring in petrochemical facilities, paint manufacturing, and adhesive production lines
- Verification of remediation efficacy in contaminated soil and groundwater sites
- Mobile screening of vehicle cabin air for off-gassing from interior materials (e.g., dashboards, upholstery)
- Academic field research requiring high-temporal-resolution VOC profiling in urban or industrial boundary layer studies
FAQ
What regulatory standards does the EQ-STT-5000 comply with?
It meets GB/T 18883–2022 Annex C.3, EPA Methods 5035 and 8021B, and supports validation against ISO 16017-1 and HJ 644–2013.
Can the instrument quantify benzene independently of other BTEX compounds?
Yes—its high-resolution MEMS column achieves baseline separation of benzene from cyclohexane and toluene, enabling selective quantification without spectral overlap.
Is external power required during field deployment?
No—fully autonomous operation is supported by the integrated lithium-ion battery with >9 hours runtime under continuous sampling mode.
How is moisture managed when analyzing humid air samples?
The carrier gas path incorporates dual-stage filtration: activated carbon removes ambient VOCs, and a 3 Å molecular sieve traps water vapor to prevent column degradation and detector saturation.
Does the system support method transfer from lab-based GC-PID platforms?
Yes—retention index alignment and linear dynamic range mapping allow direct translation of validated laboratory methods to the portable platform with documented equivalency testing.
