Single-Sided Transmission with Brazed Windows

Single-Sided Transmission Probe (SST)

The Single-Sided Transmission (SST) Probe is our most popular fiber optic probe. Rugged and reliable, it's ideal for continuous process monitoring applications. SST means that light passes through the sample region only once. In contrast, transflectance probes pass twice, being reflected from the far end. This becomes important for small optical paths. A 2 mm optical path in a transflectance probe has a 1 mm physical sample "gap", which may entrain bubbles from the process, for example.

Easily installed in a pipe or reactor through a single access port, the SST Probe works with any Guided Wave single-fiber spectrophotometer or photometer. Optional accessories make it easy to adapt the SST Probe to different kinds of process installations.

Unique Design

The SST probe houses incoming and outgoing optical fibers side-by-side in a single 3/4-inch, or 1 inch stainless steel body: This unique, compact design (U.S. Patent 6,043,895) means true transmission which translates to more signal -- less noise -- better measurements.

Process-Resistant Construction

The SST Probe is designed to withstand most process conditions. The body of the probe is built from 316 stainless steel or -- by special order -- other corrosion-resistant materials.

The SST Probe's sapphire optical windows are sealed to the probe body with proprietary gold alloy brazing. These materials are unaffected by most hydrocarbons and polymers. For extremely corrosive process streams, use the O-Ring SST Probe instead (for details, see O-Ring SST Probe data sheet). Additionally, our special construction techniques also make the probe insensitive to most process pipe vibrations.

Wide Operating Range

The SST Probe is designed to operate over a wide range of pressures and temperatures:

Temperatures to 300 °C
Pressures to 2000 psi

This probe is available in five standard lengths and ten optical pathlengths. Other probe lengths and pathlengths are available by special order.

Exceptional Light Transmission

Like other Guided Wave optical probes, the SST Probe provides exceptional optical performance. Typically, peak transmission exceeds 40%. That means more signal, lower measurement noise, and lower limits of detection. Of course, the SST Probe's optics are permanently aligned at the factory. There's no need for optical adjustments at the time of installation, nor ever any chance for misalignment or varying pathlengths.

Compatible with All Guided Wave Analyzers

The probe, or sample interface, is a crucial component of a complete analyzer system. For optimal performance, the probe must be 'optically matched' with the spectrophotometer or photometer and with the optical fiber that transmits the spectral data. The SST Probe (and each of Guided Wave’s other optical probes) are matched to Guided Wave analyzers and fiber to achieve the highest possible performance.

Optional Accessories

The optional Extractor Assembly and custom flange service facilitate installation of the SST Probe into common process pipe configurations.

Specifications

Standard Probe Lengths (inches)	12; 18; 24; 30; (36 and longer available on request)
Pathlength (mm ± 0.075 mm)	2; 3; 4; 5; 10; 15; 20; 30; 40; 50 (exact pathlength engraved on all probes)
Probe Diameter (inches)	0.750 [19 mm]; 1.000 [25.4 mm] (larger diameter recommended for probes ≥24” long)
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	200; 300; 400; 500; 600 / SMA 905; FC; ST
Fiber Types	High-OH (UV-Vis); Low-OH or Ultra Low-OH (Vis-NIR)
Efficiency	> 30%
Temperature range	-20 °C to 300 °C
Pressure Range	0 psi to 2000 psi [0 – 138 bar]
Body Material	SS316 standard; SS304, SS316L, Hastelloy, Monel, Titanium, and Nickel available on request
Window Material	Sapphire
Window Seal	Au alloy braze

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