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Model 933 H2S in Natural Gas


  • Extended, unattended operation for up to 6 months or longer
  • Self-recovery after high concentration H2S events
  • Fast response time to increasing or decreasing H2S concentrations
  • Concentration measurements of COS and methyl mercaptan optionally available
  • No consumables, reagents, or disposables other than zero gas
There is worldwide need for a low maintenance, reliable H2S analyzer in order to reduce the high expenses associated with frequent scheduled and unscheduled maintenance.

AMETEK Western Research has responded to the need for a low maintenance, reliable, and rugged H2S analyzer by developing the Model 933. The Model 933 uses a proprietary sampling technique combined with our exceptionally high resolution multi-wavelength UV optical bench. The result is a unique low level H2S analyzer that is designed to operate unattended for six months or more. The analyzer responds quickly to changes in H2S concentration and it quickly self-recovers from extreme upset conditions. 


  • Gas sweetening
  • Pipeline quality/custody transfer
  • Synthetic natural gas (SNG)
  • Blending stations

AMETEK Western Research's unique sample conditioning system uses frontal elution chromatography to separate and eliminate interfering species. This ensures an accurate analysis of the gas via direct-UV absorption spectroscopy. Two self-regenerating columns are employed in the 933. While one column is conditioning the gas sample, the other is automatically regenerated.

Optionally, the 933 can be configured to output concentration values for COS and methyl mercaptan thereby offering an extremely cost effective solution for monitoring these compounds. 

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