Posted in | Fiber Optic Probes

Corrosion Resistant Single-Sided Transmission Process Probe

As one of the most popular fiber optic probes offered by Process Insights, the SST has been commercially available for over 25 years, making this product the most widely copied probe design in the industry. As a highly rugged and reliable option that can be easily installed within a pipe or reactor through a single access port, the SST probe is ideal for continuous process monitoring applications. Additionally, the SST Probe is compatible with any Process Insights analyzer and many other analyzer brands.

The SST probe can be made to accompany a wide a variety of optional accessories that allow for it to easily adapt to applications in different types of process installations. The SST probe houses both incoming and outgoing optical-fibers side-by-side in a single 3/4-inch, or 1-inch stainless steel body (U.S. Patent #6,043,895), thereby allowing true transmission rates to be analyzed and ultimately provide users an improved signal, reduced noise and overall better measurements.

Product Features and Specifications

  • Corrosion-resistant construction
    • However, for extremely corrosive process streams, it is recommended that the O-Ring SST Probe is used instead.
  • Rugged design
    • Resistant to most process pipe vibrations
  • O-ring process seals
    • Sealed to the probe body with proprietary gold alloy brazing
    • Provides protection of the probe against hydrocarbons and polymers.
  • Sealed against ambient moisture infiltration
  • High optical throughput for low noise spectroscopy
  • Standard Probe Lengths (inches):
    • 12
    • 18
    • 24
    • 30
    • 36
    • Additional lengths can be made available upon request
  • Pathlength (mm ± 0.075 mm):
    • 2
    • 5
    • 10
    • 15
    • 20
    • 50
    • Additional lengths can be made available upon request
  • Probe Diameter (inches):
    • 0.750 (19 mm) ± 1.000 (25.4 mm)
    • Larger diameter is recommended for probes that are 24” or longer in length
  • Spectral Range:
    • UV-Vis: 230 – 600 nm
    • Vis-NIR: 380 – 1100 nm
    • NIR: 800 – 2100 nm
  • Optics:
    • Fused silica (UV-Vis)
    • BK7 (Vis-NIR)
  • Fiber Diameter (μm)/Connector:
    • 400
    • 500
    • 600
    • SMA 905
    • FC
    • ST
    • Additional options can be made available upon request
  • Fiber Types:
    • Deep UV (UV-Vis)
    • Ultra-Low-OH (Vis-NIR)
  • Optical Efficiency (%T):
    • > 30% for pathlengths ≤ 20 mm
  • Temperature Range:
    • -45 °C to 300 °C
  • Pressure Range:
    • 0 psi to 2000 psi
    • 0 – 138 bar
    • Higher pressures can be made available upon request
  • Body Material:
    • 316L SS standard
    • 304 SS
    • 316 SS
    • Hastelloy
    • C-276
    • Monel
    • Titanium
    • Nickel
    • Additional materials can be made available upon request
  • Window Material:
    • Sapphire (Vis-NIR)
  • Window Seal:
    • Proprietary gold alloy brazing
  • Mounting:
    • Swagged fittings
    • Custom flanges
    • Extractor assembly mechanism option (doc #10346)
  • Various versions available, of which include:
    • Five different standard lengths
    • Six optical pathlengths
    • Additional probe lengths and pathlengths can be made available upon request
  • Typical peak transmission exceeds 40%
    • Improves signal
    • Lowers measurement noise
    • Reduced limits of detection
  • Optics of the probe are permanently aligned at the factory
    • Eliminates the need to make any optical adjustments at the time of installation
    • Eliminates any possibility of misalignment or varying pathlengths

Compatible with All Process Insights Analyzers and Many Other Analyzer Brands

The probe, or sample interface, plays a crucial role within the complete analyzer system. To ensure the highest optimal performance, it is imperative that the probe is optically matched with both the spectrometer and optical fiber that is used to transmit the spectral signal.

Similar to all other Process Insights’s optical probes, the SST Probe is also matched to all Process Insights analyzers and fibers to ensure that the highest possible performance is achieved. It is also important to note that Process Insights probes are also capable of working with numerous other fiber optic analyzers of varying diameter and spectral ranges which are produced by different manufacturers.

Optional Accessories

The SST probe can be made available with various optional accessories that allow for the probe to easily adapt to numerous different types of process installations. For example, the Extractor Assembly Mechanism allows for a rapid and easy removal and servicing of probes without requiring the process to come to a halt. Additionally, Process Insights’s custom flange service facilitates the easy installation of the SST Probe into common process pipe configurations.

Large Variety and Custom Designs Available

Process Insights offers a wide variety of probes, flow cells and fiber optic cables that are capable of meeting the harsh demands of the process environment. In fact, these options are often equipped with various auxiliary features, all of which remain compatible with all Process Insights analyzers, as well as several other fiber optic based analyzers that are manufactured by other companies.

Most of Process Insights’s probes and flow cells can be optimized for the UV, visible or NIR spectral regions, or even supplied with custom fiber diameters and connectors to meet the specific optical requirements for each customer’s purpose. Note that if Process Insights does not offer a specific probe or flow cell that is required for a customer’s purpose, this company will specifically design a custom solution to meet a particular process installation.

SST Probe


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