Posted in | Fiber Optic Probes

O-Ring Single Sided Transmission Process Probe - O-SST Probe

The O-SST probe offered by Process Insights is an in-process fiber optic probe that is useful for the use in a corrosive process stream that contains strong acids, bases, or cyanides. With a similar performance rate as compared to Process Insights’s gold alloy sealed SST probe, the O-SST instead utilizes polymer O-rings to seal the sapphire windows within its system.

An additional similarity between the SST and the O-SST probe involves their high optical throughput for low noise in-line spectroscopy during complex solutions, thereby eliminating the need for costly and problematic fast loops and sample systems. The O-SST can be made available in several convenient pathlengths, probe lengths, O-ring materials and commonly used chemically resistant stainless steel alloys.

Product Features

  • Corrosion-resistant construction
    • Particularly those containing nitric acids or cyanides that can harm the gold alloy sealed SST probe
  • Rugged design
  • O-ring process seals
    • Sapphire optical windows
    • Options available to best meet process requirements
    • Contact DuPontTM Elastomers for further inquiry on these material options.
  • Sealed against ambient moisture infiltration
  • High optical throughput for low noise spectroscopy
  • Collimated beam for accurate absorbance measurements
  • Vibration resistant design
  • Probe can be easily dismantled
    • Allows for periodic O-ring servicing
      • It is recommended that users have Process Insights professionals perform O-ring services to ensure optimum probe performance
  • On request, the O-SST can be supplied welded to an ANSI or DIN process flange.
  • Operating Range:
    • Determined by the choice of the O-ring material
    • Maximum temperature: 250 °C
    • Maximum pressure: 1000 psi
  • Various versions available, of which include:
    • Five different standard lengths
    • Nine optical pathlengths
    • UV, Visible and NIR versions available
    • Additional probe lengths and pathlengths can be made available upon request

Exceptional Light Transmission

In a similar manner compared to all other Process Insights optical probes, the O-SST Probe offers users an exceptional optical performance. For example, the peak transmission of the O-SST typically exceeds 40%, thereby providing a greater signal, lower measurement noise, as well as reduced limits of detection.

Compatible with All Process Insights Analyzers

The O-SST probe, or sample interface, plays a crucial role within the complete analyzer system. To ensure optimal performance, the probe must be ‘optically matched’ with both the spectrometer and the optical fiber that transmits the spectral data.

All Process Insights’s optical probes, including the O-SST, are matched to Process Insights’s analyzers and fiber to ensure that the highest possible performance rate is achieved. Additionally, the O-SST is compatible with many other fiber optic analyzer brands in reference to their fiber diameter and spectral range.

O-SST Probe


Available Customization

Process Insights offers a wide variety of probes, flow cells and fiber optic cables that can meet 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.

Product Specifications

  • Standard Probe Lengths (inches):
    • 12
    • 18
    • 24
    • 30
    • 36
    • Additional lengths can be made available upon request
  • Pathlength (mm ± 0.075 mm):
    • 1
    • 2
    • 5
    • 10
    • 15
    • 20
    • 30
    • 40
    • 50
    • Additional lengths can be made available upon request
  • Probe Diameter (inches): 1.000 ± 0.005 [25.4 mm ± 0.13 mm]
  • Spectral Range:
    • UV-Vis: 200 – 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)
    • Low-OH
    • Ultra-Low-OH (Vis-NIR)
  • Optical Efficiency (%T):
    • > 30% for pathlengths ≤ 20 mm
  • Temperature Range:
    • Determined by O-ring material
    • Cannot exceed –25 °C to 250 °C
  • Pressure Range:
    • 0 psi to 1000 psi
    • 0 – 69 bar
  • 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)
    • Fused Silica (UV)
  • Window Seal:
    • Polymer O-ring material of your choice with a Durometer of 70 Shore A or greater, of which include:
      • Kal-Rez® 7075
      • Kal-Rez® 6375
      • Kal-Rez® 4079
      • Viton
      • EPDM
      • Silicone
  • Mounting:
    • Swagged fittings
    • Custom flanges
    • Extractor assembly mechanism option (doc #10346)

Other Equipment by this Supplier

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