Series 6000TSL and 6400-TSL Total Sulfur in diesel or gasoline

Using UV-Fluorescence detection technology

     This Model 6000-TSL System is designed for analyzing total sulfur concentration in liquid samples. It consists of a Model 6400EU SO2 UV Fluorescence Analyzer, a Quartz Tube Converter Module (QTCM), a Total Sulfur Liquid Control Unit (TSL-CU) and a Sample Control Panel. The system is housed in a freestanding NEMA-4 enclosure with ATEX rated X-purge System. It is suitable for operation in Zone 1 EEx p IIC T3 environments. 


  • Ranges from 0-30ppm to percent
  • cycle time from 2 to 6 min
  • Non-consumable sensing technology
  • High-temperature quartz tube convertor complete sulfur conversion
  • No maintenance of QTCM expected in first two years of service
  • No pure oxygen required as a utility gas
  • Single and multiple sequenced stream configurations available
  • Class I Div 1 (Zone 1) and Class I Div 2 (Zone 2) configurations available

Theory of Operation

     The undesirable sulfur compounds present (i.e. H2S, DMS, COS, CH3SH, CS2, etc) are converted into sulfur dioxide (SO2) under precisely controlled temperature and flow conditions. 

SO2 + hv¹ -> SO2*-> SO2 + hv²

     When SO2 is exposed to UV light energy, hv1, it creates an "excited" form of sulfur dioxide, SO2*. A molecule in a high, vibrational level of the excited state, SO2*, will quickly fall to its lowest vibrational level by losing energy to other molecules through collision. Fluorescence occurs when the molecule returns to its electronic ground state. The intensity of the emitted light, hv2, is directly proportional to the total sulfur content found in the sample. 

     The converted sample gas is dried, then fed to the Model 6400E UV Fluorescence Analyzer where the SO2 Analysis takes place and is conveniently displayed as Total Sulfur.