On-line Calibration for Trace Sulfur Species

Effective calibration for ‘total sulfur’ often requires a mix of compounds where the concentration of each compound is known.  For example, a 1ppmw specification for total sulfur in propylene may also require a maximum of 50ppbw of COS combined with a range of other compounds including H2S, mercaptans, and some heavier sulfides.

Span Pac™ 261 I, Dual Channel, Industrial Permeation System produces suitable standards for these requirements.  One channel is operated at 40°C and is used for ppb COS plus 0.5ppm each of H2S, methyl and ethyl mercaptans.  The second channel is typically operated at 60°C and is used for similar concentrations of dimethyl sulfide, dimethyl disulfide and/or thiophene.

The Span Pac™ I is housed in a NEMA 4 cabinet and is available with Div 2 or Div 1 purge package for hazardous area service. Oven temperatures and permeation tubes are selected to suit the application.


  • On-Line Product Quality Assurance
  • HAPs Monitoring
  • Process Control
  • Stationary Source Monitors
  • • Toxic Gas Monitoring