The Model 331S H2S Analyzer utilizes field proven tape based technology that provides a linear and interference-free output of H2S. An optional Total Sulfur measurement can be added to the analyzer. Certified for Class I, Div 2, Groups A, B, C and D.


  • Fast Response times using Rapid Response Algorithm (RRA) ~20 seconds to alarm
  • No interference from other components in the sample
  • Low power consumption < 3 Watts
  • Extended tape life of 60-90 days
  • Measures up to 5 times the calibrated range
  • Quick delivery - as quick as 1 to 2 days for standard systems
  • Full field service & training available

Applications Areas

The Model 331S measures H2S and/or Total Sulfur in natural gas, petrochemical streams, condensate, liquids, or LPG. Common applications include:

  • Sales Gas
  • Plant Inlet
  • Pipeline Monitoring & Blending
  • H2S Scavenger Systems
  • Wellhead Monitoring
  • Acid Gas
  • Fuel Gas Monitoring
  • Bio Gas

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