ChromaTHC

Technical Specifications

ChromaTHC - Total HydroCarbons analysis
  • Detection Limit:
    • 20 ppb for methane and < 20 ppb on NMTHC eqC3
    • chroma THC-1 ppb: LDL < 1 ppb for TVOC
    • % with internal loop valve (XXXVALVEHC)
  • Detection Range:
    • 20 to 5000 ppb (ampli 3)
    • 0.2 to 200 ppm (ampli 2)
    • 0 to 5 % with smaller sampling loop
    • 1 to 2000 ppb (ampli 3)
  • Relative Standard Deviation:
    • < 0.3 % over 48 h (RT)
    • < 2 % over 48 h (Span Concentration)
  • Results:
    • Embedded computer WindowsR based with LCD display
    • 128 GB of hardware storage on SSD memory
    • Ethernet, remote control
    • MODBUS RTU / MGS1 or JBUS
  • Cycle time:
    • 2 minutes for 0-3 ppm in ambiant air (standard)
    • 3 to 5 minutes or more for higher concentrations or process application (option)
    • chromaTHC-1 ppb: 10 min
  • Gas supply:
    • H2 (FID and carrier gas): 30 mL/min (Inlet 2 bars; 1/16’’ double ferrule)
    • Air (FID): 180 mL/min (inlet 3 bars; 1/8’’ double ferrule)
    • Sample inlet (vacuum pump in option) 1/4’’ double ferrule 80 mL/min at ambient pressure
    • Pneumatic valve 90 mL/min valve actuation
  • Sample volume:
    • Injection loop with volume designed according applications

Total HydroCarbons analysis

CH4 and Non-Methane Total Hydro Carbon (NMTHC) Monitoring and analysis of Methane and Non-Methane Hydrocarbons by flame ionization detection (ppm level analysis)

The chromaTHC is an automated isothermal industrial gas chromatograph dedicated to the analysis of volatile organic compounds in air (indoor, outdoor, combustion), industrial hygiene, pure gas like N2/CO2/O2.

  • As a fully automatic instrument, the CHROMATHC allows un-attended operation after commissioning 24/24.
  • The injection is made in an isothermal oven at a standard temperature 80°C.
  • The separation between CH4 and (C2H6 for UHC) and NMTHC is achieved using a column with back flush.

Unlike other similar analyzers, there is no interference with oxygen.

To eliminate issues with flame fluctuation, a valve regulates carrier gas (hydrogen or Nitrogen or air).
The retention time drift is less than 0,3 %.

  • The instrument has a flame ionization detector (FID) heated at 150°C with auto ignition.

VISTACHROM ® software :
 Chromatotec developed software system allows :

  • Remote monitoring
  • Full traceability through archiving of results and QC
  • Set up and control of threshold alarms
  • Export of data MODBUS / MGS1 / 4-20mA /0-10V

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