Odor & VOCs monitoring for Odor & Chemical Control Units (OCU)

Technical Specifications

ChromaTHC-OCU - Odor & VOCs monitoring for Odor & Chemical Control Units
  • Detection Limit:
    • 20 ppb for methane and < 20 ppb on NMTHC eqC3
    • chroma THC-1 ppb: LDL < 1 ppb for TVOC
  • Detection Range:
    • chromaTHC-2 MIN:
      • 20 to 2000 ppb (ampli 3)
      • 0.2 to 20 ppm (ampli 2)
    • chromaTHC-1 ppb:
      • 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:
    • chroma THC-2 MIN:
      • 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 commutation
  • Sample volume:
    • Injection loop with volume designed according applications

Methane, Non-Methane Total Hydrocarbons and Total Hydrocarbons with ChromaTHC-OCU

When odor issues occur at an industrial site, rapid diagnosis must be done to define the best source treatment strategy. Manual sampling techniques can lead to problems during sampling and transport to the laboratory for analysis. Therefore, there is a need for online analyzers to monitor odors constituents such as methane and non-methane Volatile Organic Compounds (VOCs). Online monitoring of methane (CH4) and Non-Methane Total Hydrocarbons (nmTHC) with an all-in-one solution allow accurate and fastest results.

This fully automatic, wall-mounted instrument consists in a ChromaTHC : an automated Gas Chromatograph (GC) with Flame Ionization Detection (FID). It provides the ability to quantify CH4 and nmTHC (with THC by sum) concentrations from ppb to ppm within only 2 minutes and without matrix effects.

Designed for odor and chemical control units, it includes a built-in computer and zero air and hydrogen generators. The measurement system performance evaluation is completed using the internal calibration with a permeation tube to provide automatic data validation. Additionally, a 3G/4G MODEM is available for data transmission and automatic alarm by SMS function to inform user and provider when media support (activated carbon or bio filters) is saturated and needs to be replaced.

This fully automatic user-friendly system does not require specialized people to operate. The high quality of the information is assured without the need for verification by an expert.

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