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Sulfimax GX online GAS

Continuous quantitative determination of hydrogen sulphide (H2S) in gas mixtures

Sulfimax GX online GAS    
Sulfimax GX online GAS for online
determination of H2S in gases

The Sulfimax GX online GAS was developed for the continuous determination of hydrogen sulphide (H2S) in gas mixtures.

The system is designed in such a way that both very high concentrations (100 - 20000 ppm) and low contents in the range of the odour threshold (0.1 - 100 ppm) can be measured by means of a built-in dilution stage.

The Sulfimax GX online GAS contains a selective amperometric sensor with gas selective membranes, membrane pumps for gas transportation and sample transfer and an integrated PC for continuous recording of measurement data, trends and alarm states. The measurement results can be transmitted to the control room via digital (alarm) and analogue outputs.

The Sulfimax GX online GAS enables gas analysis without drift phenomena in oxygen-free gases, such as biogas, due to its automatic purging circuits. Due to the gentle mode of operation, the service life of the sensor is considerably extended.

Due to its mode of operation, the Sulfimax GX online GAS can be used as the basis for H2S-adapted control of enrichment and purification stages.

The device is available in the same way for the monitoring of ammonia (NH3), sulphur dioxide (SO2) or ozone (O3).


  • Online recording of the current H2S concentration as basis for H2S-adapted controls (e. g. pump sump, gravity lines, collecting tanks)
  • Biogas processes, fermentations
  • Environmental analytics
  • Wastewater analysis
  • Landfill leachate monitoring

Fields of applications:

  • Municipal wastewater associations
  • Industrial sectors
  • Biogas plants
  • Petroleum processing


  • Fully automated sample dosing
  • Hardly any cross-sensitivities due to selective electrochemical sensor
  • Output 4 - 20 mA for integration of the H2S signal into the local control system
  • Long sensor life due to intermittent gas path gas path switching
  • Integrated rinsing steps for measuring of continually fresh samples
  • Active sample aspiration, thus free installation (wall mounting) with up to 100 m distance from the sampling point


  • Continuous H2S gas analysis (measuring time < 5 min)
  • Robust analysis method (drift stability)
  • Simple calibration
  • Simple, clear software
  • Integrated purging steps to ensure a constantly updated sample for analysis
  • Active sample intake of the gas up to a distance of 100 m – variable setup of device (wall mounted)
  • Also available for measuring ammonia (NH3), sulphur dioxide (SO2) or ozone (O3)


Data sheet Sulfimax GX online GAS



ECH Elektrochemie Halle GmbH
Otto-Eißfeldt-Straße 8
06120 Halle (Saale)

Tel.: +49 345 279570-0
Fax: +49 345 279570-99
Mail: info@ech.de

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ECH Scientific Limited
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Bedfordshire, MK45 4HS
United Kingdom

Tel.: +44 1525 404747
Fax: +44 1525 404848
Mail: info@echscientific.com

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