On-line calibration for trace sulfur species is achievable with the Span Pac I from Kin-Tek, suitable for applications including on-line product quality assurance, HAPs monitoring, process control, stationary source monitors, and toxic gas monitoring.
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.
The 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.