A Online analysis and monitoring of H2S

  • Model:  H2S MEDOR®
  • Manufacturer: Chromatotec
The H2S MEDOR® is an autoGC-ED (MEDOR® Electrochemical wet cell Detector) for the analysis and monitoring of H2S in natural gas and gaseous fuels.

Main applications:

  • Trace and ultra trace detection in Natural Gas / LPG / Gaseous Fuels
  • H2S in crude oil / Diesel / Fuel oil / Condensates / water
  • Deodorisation/Desulfurisation control ppb
  • Catalyzer protection
  • H2S in pure gas : H2 with special application
The H2S MEDOR® is an autoGC-ED (MEDOR® Electrochemical wet cell Detector) for the analysis and monitoring of H2S in natural gas and gaseous fuels. Three versions exist:
  • H2S MEDOR® ppb for 0 – 1 ppm
  • H2S MEDOR® ppm for 0-10 / 0-50 / 0-100 ppm
  • H2S MEDOR® % for 0-10 %


  • Automatic sampling using a loop
  • Automatic loop injection on column
  • Isothermal gas chromatograph
  • Detection of H2S eluting from the column performed by MEDOR® Detector:Electrochemical wet cell Detector which is SSD Sulfur Specific Detector.
  • Signal provided by electrochemical reaction between the wet cell electrolyte and the sulfur compounds

Key points:

Fully compliant with ASTM D 7493-22 : Standard Test Method for Online Measurement of Sulfur Compounds in Natural Gas and Gaseous Fuels by Gas Chromatograph and Electrochemical Detection.

Continuous monitoring with automatic online sampling. Analytical performances:

  • Specific, linear and very sensitive to H2S
  • Results validation by automatic standard injection
  • Extremely low maintenance
  • Very long life time detector with electrolyte, up to 10 years
  • Low gas consumption, can be reduced in option
  • More than 10 years data storage : full chromatogram
  • No cylinders required thanks to internal calibration tube and gas generators
  • Automatic control with process device
  • Intelligence system with tunable and interactive alarms levels

Powerfull VISTACHROM Chromatotec® software:

  • Remote monitoring & injection control
  • Full traceability with on board archiving of results and chromatograms
  • QC Set up and control of threshold alarms
  • Data export by MODBUS
  • Time stamp results


  • Multiple stream selector (up to 16 streams with one analyser)
  • Modeling software with weather station for live odor/chemical impact
  • Explosion proof version Exp or Exd for ATEX, IECEx zone 1 and 2 and also for CSA C1D2 group B , C & D T4
  • Calculation modules (Average / Statistics / Odor unit OU e/m3 and more)
  • Automatic data transfert through: Module for 4 outputs 4-20 mA (with 0 mA for instrument default) / 0 – 10 V / MODBUS RTU or TCPI IP or MGS1
  • Nitrogen or air generator for safe and hazardous area
  • 24 V DC power supply
  • Electric selection valve to reduce air consumption
  • Wall mounted box XXX934
  • Liquid injection valve for LPG analysis
  • Touch screen on the front panel for Exp version (only ATEX)
  • External cylinder inlet for automatic calibration from external cylinder
  • MFC for multipoint calibration from internal CALIB and/or from cylinder
  • Zero metho
Detection Limit: H2S MEDOR® ppm :
• H2S : 0.1 ppm (0.1417 mg/m3) H2S MEDOR® ppb :
• H2S : 1 ppb (1.39 µg/m3)
Range (adjustable depending on application): • 0/10 or 0/100 or 0/1000 (ppb or ppm)
• % with internal loop
Relative Standard Deviation: • RSD < 3 % on concentration over 48H
• RSD < 0.5% on retention time over 48H
Cycle Time: • H2S 120 s for 0 – 3 ppm ran
• H2S 300 s for higher range
Supervisor: • Embedded computer Windows® based with LCD display
• 128 GB of Hardware storage on SSD memory
Linearity: • > 0.995
Communication: • MODBUS RTU included in standard
• Ethernet, remote control
Gas supply: • Carrier: Dry air or N2 (3 bar): < 4 ml/min
• Internal calibration: 50 ml/min for ppm range
• Sample inlet 1 bar and 160 ml/min sample flow
• Pneumatic valve 90 ml/commutation
Power supply: • Main: 230 V / 115 V or 50/60 Hz
• Power: 24V (optional)
Electrical consumption: • Average: 150 VA
Dimensions and weight: • Rack: 19″ (5U)
• Height: 222 mm
• Width: 482mm
• Depth: 600 mm
• Net weight: 22 Kgs
Wall mounted Exp version :
• Height: 800 mm
• Width: 600mm
• Depth: 300 mm
• Net weight: 40 Kg
To order: Model:
H2S MEDOR® inbuilt computer 5U with CALIB

H2S MEDOR® Ex px certified ATEX zone 2

H2S MEDOR® Ex px certified ATEX zone 1

H2S MEDOR® Exd ATEX zone 1

H2S MEDOR® Ex px certified IECEX zone 1

H2S MEDOR® Exd IECEX zone 1



M51022M51022 -ATEX-Z2

M51022 -ATEX-Z1

M51022 -ATEX-Z1-Exd

M51022 -IECEX-Z1

M51022 -IECEX-Z1-Exd

M51022 -CSA-C1D2

M51022 -CSA-Z1-Exd



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