COMBIMASS® GA-s hybrid eco CH4 & H2S

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The COMBIMASS® GA-s hybrid eco is a benchtop analyser with standard gas modules, without graphic display. In the basic version it has two gas modules CH4 and H2S of the hybrid series with the possibility to measure one gas stream. By means of an upgrade option, we are able to increase the measuring range to two streams for gases such as methane, hydrogen sulphide and oxygen. It is mainly used for monitoring the biogas filter upstream of the CHP engine. Choice of plastic housing or, in a more expensive version, stainless steel.


  • Monitoring of the biogas filter upstream of the CHP engine

Operating range:

  • CH4 gas module of the hybrid series with NDIR cell, operating range: 0 – 100 % v/v
  • H2S gas module of the hybrid series with electrochemical cell, operating range: 0 – 50 (200 or 2,000) ppm
  • Housing: plastic, 400 x 400 x 200 mm, for wall mounting
  • Number of sampling points: 1 (expandable to 2)
  • Ambient conditions: indoor installation, room ventilated and monitored for LEL, temp. + 5 to + 40°C, relative humidity <80%, in a non-corrosive environment
  • Gas properties: + 5 to + 40°C, 10 to 90% relative humidity
  • Protection class: IP22
  • Gas pump flow rate: 500 ml/min (during gas sampling)
  • Data transmission: analogue signal 4 – 20 mA


  • further O2 gas module 0 – 25% v/v
  • second gas sampling point
  • Gas transmission via Modbus RTU
  • all connections made of stainless steel (typically used in waste water treatment plants)
  • external 230 V AC/24 V DC power supply box (for the analyser cabinet, which operates at 24 VD C for safety reasons)
  • 1 gas cooler with DTG-GK hardware extension, a second pump and one NO valve (in addition to the NC valve upstream of the H2S module), if methane is to be analysed continuously
  • reading and sending of the analogue signal from the biogas flow meter of the COMBIMASS® series
  • heating/cooling device for external installation of the analyser
  • COMBIMASS® GA-s hybrid eco CH4 & H2S