No Sample Conditioning Required
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| 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
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| 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)
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| 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
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| 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
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| 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
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