Online analysis and monitoring of sulfur compounds in natural gas and gaseous fuels

  • Model: energyMEDOR®
  • Manufacturer: Chromatotec

The energyMEDOR® is an autoGC-ED (MEDOR® Electrochemical wet cell Detector) for the analysis and monitoring of sulfur compounds in natural gas and gaseous fuels: H2S, Mercaptans, Sulfides. Two versions exist:

  • The energyMEDOR® ppm (which measures at ppm levels)
  • The energyMEDOR® ppb (which measures at ppb levels)
Targetted compounds:
  • In standard: THT / H
  • 2S / DMS / Mercaptans: MM / EM / IPM / TBM /NPM/ MES/ 2 BM
  • In option: IBM / NBM
  • Impurities detection in Natural Gas / LPG / Propane / Butane
  • Deodorisation control ppb
  • Propellant gas
  • Catalyzer protection
  • Natural gas or LPG odorisation control ppm
  • Petrochemical
  • Gas transportation
  • Process
  • Fiscal metering station


The energyMEDOR is the fully automated Gas Chromatograph for sulfur monitoring. With only a need for nitrogen carrier gas and standard electrical power, installation can be made into your current monitoring enclosure or installed in a standalone system.The energyMEDOR is equipped with two columns, heated in isothermal oven with a preset temperature of 45°C, a 10-ports pneumatic valve, electrochemical detector and an internal permeation standard or external cylinder to validate your results.The energyMEDOR automatically samples the NG from the pipeline continuously in low volume, the NG travels through a loop, the loop is injected onto the chromatographic columns where the sulfurs are separated, after the columns the sample is detected on the electrochemical detector without additional conversion or sample manipulation. Following the detection of the compounds the onboard system processes the data and provides the operator with data in either analog or digital formats. In addition the operator can review all data with the software installed into the energy MEDOR.

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 sulfur compounds
    • Results validation by automatic standard injection
    • Long term stability using wet cell detector installed in reservoir
  • 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
    • No cylinders required thanks to internal calibration tube
  • 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 / 4-20 mA / 0-10 V
    • Time stamp results

Available options

  • Explosion proof version Exp or Exd for Atex IECEx zone 1 and 2 group IIC T4 and also for CSA C1D2 group B , C & D T4
  • Internal calibration and validation system with permeation tube
  • Multiple stream selector (up to 16 streams with one analyzer)
  • Calculation modules (Average / Statistics / Odor index…)
  • Automatic data transfert through: Module for 4 outputs 4-20mA (with 0 mA for instrument default / 0-10 V / Modbus RTU or TCP IP
  • Electric selection valve to reduce air consumption
  • 24 V DC power supply
  • Nitrogen generator for safe or hazardous area

Detection limits:

  • MEDOR® Exd ppm:
    • H2S: 0,1 ppm (0,14 mg/m3)
  • MEDOR® Exd ppb:
    • H2S: 5 ppb (7,0 μg/m3) or DMS: 2 ppb (5,1 μg/m3)

Range adjustable, depending on application:

  • 0/10 or 0/100 or 0/1000 ppm or ppb
  • Calculation: total sulfur, total mercaptans…

Relative Standard Deviation:

  • RSD < 3% on concentration over 48H.
  • RSD < 0.5% on retention time over 48H.

Cycle Time:

  • H2S 120 s
  • H2S/TOS/TS 120 s
  • THT 180s (if only THT)
  • H2S, MM, EM 300s
  • H2S, mercaptans, THT 720 s
  • H2S, mercaptans, THT 900 s with CALIB for validation of each analysis
  • THT 900 s with CALIB for validation of each analysis
  • Embedd industrial computer Windows® based with LCD display
  • 128 GB of hardware storage on SSD memory


  • MODBUS communication protocol
  • 4-20mA
  • Ethernet
  • 3G module (optional)

Gas supply for GC operation:

  • Carrier: zero air or N2 (3 bar): 4 ml/min. Use N2 if THT is present
  • CALIB: air or N2 50 ml/min
  • Sample inlet 1 bar: 80 ml/min
  • Pneumatic valve: 90 ml/commutation (0 ml in option)

Power supply:

  • Main: 230V / 115V or 50/60 Hz
  • 24 V DC in option

Electrical consumption:

  • 150 VA without options

Dimensions and Weight:

  • Height: 1900 mm
  • Width: 800 mm
  • Depth: 600 mm
  • Net weight of analyzer without frame: 105 kg (175 kg with frame)



Case study energyMEDOR


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