GC chromatograph airmoS

gasfor gas analysisfor sulfur compounds

Overview
airmoS is a fully automatic isothermal gas chromatograph for analysis and continuous monitoring of sulfur compounds (mercaptans & sulphides) in ambient air. The system is optimized for trace-level sulfur quantification and integrates an auto GC with valve, a sample trap, metallic capillary columns and a sulfur-specific photometric flame detector (FPD).

Main specifications

• Continuous, uninterrupted sampling for real-time surveillance
• Sample injection into the column oven for chromatographic separation
• Controlled oven that selects optimum temperature profiles depending on application
• Detection via a sulfur-specific photometric double flame detector (FPD)

Technical Specifications

• Detection limits with trap:
  • 0.1 ppb (double sulfur compounds, e.g. DMDS, CS2)
  • 0.2 ppb (single sulfur compounds, e.g. MM, DMS)
• Detection limits with loop (option):
  • 14 ppb for H2S / SO2 / MM / EM / DMS / DES / COS
  • 8 ppb for DMDS & CS2
• Detection range with trap:
  • 0.2 to 10 ppb (amplification 2)
  • 1 to 40 ppb (amplification 1)
• Detection range with loop (option):
  • 0.01 to 10 mg/m3 or 0 to 600 mg/m3 (compound-dependent)
  • Example for H2S: 0.01 to 10 mg/m3 ≈ 7 ppb to 7 ppm
• Relative Standard Deviation (RSD):
  • Concentration results (amplification 1) ≤ 5%
  • Retention time for all compounds (amplification 1) ≤ 2% and SD ≤ 2 s
• Results and data handling:
  • Full result storage including chromatograms
  • Embedded Windows®-based computer with 10'' TFT color LCD
  • 128 GB SSD hardware storage
  • 4 USB ports and 2 RS-232 ports
• Cycle time:
  • 10 min in airmoS or chromaS single mode
  • 30 min in dual mode (option): 10 min chromaS + 20 min airmoS
• Gas supply:
  • Carrier gas: N2 recommended (compressed air possible) 3 bar (5 ml/min) 1/8"
  • Sample inlet: -1 bar or ambient pressure (airmopump)
  • Sampling dryer: 150-200 ml/min of dry air
  • Detector gas: H2 at 2 bar (70 ml/min) 1/8" – Air at 3 bar (80 ml/min) 1/8"
  • Pneumatic valve: 90 ml per commutation

Application notes
Designed for monitoring mercaptans and sulphides in ambient air where trace-level sensitivity is required. Typical application: continuous ambient air surveillance using chromatographic separation followed by sulfur-specific FPD detection for reliable identification and quantification.

Technical features

• Model: airmoS auto GC-trap-FPD analyzer
• Detection capability: sub-ppb (with trap) for many sulfur compounds
• Data storage: chromatograms and results on 128 GB SSD
• User interface: embedded Windows-based computer, 10'' TFT color LCD
• Cycle time: 10 min (single mode) / 30 min (dual mode)
• Recommended carrier gas: Nitrogen; alternative: compressed air
• Connectivity: 4x USB, 2x RS-232