RKI Instruments Equipment

Digester Gas Monitor

RKI Instruments

Data Sheet
Operator’s Manual
Maintenance Manual

Instrumentation Equipment

Digester Gas Monitor


RKI is proud to introduce our Digester Gas Monitor. Gas from waste digesters contains high levels of methane, CO2, and H2S, with little to no oxygen present. The RKI gas monitor checks for all these gases on a cyclic basis. A powerful air aspirator pulls a sample from up to 100 feet away. Since digester gas contains high humidity and high H2S, both of which can cause damage to sampling systems, the RKI Digester Gas Monitor is designed to handle these with no damage to the sampling system or sensors. The sample is filtered through a series of dirt, dust, and moisture stopping filters, and these filters are automatically blown back and cleaned out with fresh air at the end of each cycle.


  • Corrosion resistant design
    • External construction for extreme environments
    • Internal construction for extreme samples
  • Sample system for high humidity]
  • Accurately measure gas with high levels of H2S present
  • 100 ft. sample range
  • Up to 4 sensors:
    • Methane % Vol.
    • CO2 % Vol.
    • Oxygen % Vol.
    • H2S 0-1000 PPM (0-3000 or 0-5000 optional)
  • Self draining moisture trap
  • Back flush for sample line
  • Long life air aspirator (no moving parts)
  • Inside/outside location
  • NEMA 4X enclosure
  • Uses proven RKI technology
  • Modular design easy to maintain
  • Simple to operate
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P.O. Box 397
W166 N11965 Fond du Lac Ave.
Germantown, WI 53022