OSBanner
Refinery Solutions > Gasoline Blending > No Sample Conditioning Required

No Sample Conditioning Required

No sample conditioning required for most online Raman measurements
Unlike near infrared (NIR) spectrometry, Raman is not very sensitive to process temperature changes
  • Normally does not require sample stream temperature control
  • Process stream samples are typically run on lab Raman instrument at room temperature (~ 21°C)
    • Chemometric models are then transferred to an online analyzer
      • Stream temperature may be > 200°C
  • Unlike NIR’s strong water absorption, Raman scattering is very weak for water
    • No need to remove water via chillers or other water filtration equipment for most online analysis
  • Raman is not sensitive to particulates
    • Filtration of sample streams is not normally required
  • Depending on type of stream, 1 µ filter can be used
    • Minimizes flow cell window contamination
    • Reduces cleaning requirements  
Intrinsically safe, fiber optic coupled remote sampling cells 
ATEX and IECEx
  • Rated for Zone 0
  • Uses proprietary Safe-Laser Interlock™ technology
  • Fiberoptic cable coupling lengths – up to 1,000 ft (300 m)
  • Flow-\ through sample cell
    • Rated for
      • – 80°C to 250°C
      • Up to 3,000 psi (150 bar)
Typical flow cell maintenance requirement – ~ 2 hours/year/probe  
  • Cleaning of probe flow window requires ~ 5 minutes, typically quarterly or semi-annually
    • Eliminates or reduces sample conditioning equipment
    • Greatly simplifies Raman equipment installation
    • Greatly reduces maintenance costs
Flow through sample cell configuration 
  • Flow sensors alarm to distributed control system (DCS) for
    • No flow condition
    • Grab sample collection time
  • Standard wettable surfaces – stainless steel grade 316
  • Alloy 825, Monel 400, Hastelloy, and other materials – available upon request
In-line Low Temperature
Direct insertion probe configuration
  • User friendly features allow for direct insertion of our Raman probes into many process streams
    •   Eliminates need for speed loops and circulation pumps
Safe Immersion Probe