Fiber Optic Sensing cables for Cryogenic / High Temp application

FO cables for Cryogenic / High Temp

Distributed Fiber Optic Sensing (DFOS) allows for fully distributed temperature sensing over multiple kilometers without the need of electricity at the measurement position. It is a key technology for monitoring critical infrastructure such as LNG pipelines and tanks, oil and gas pipelines, chemical plants, kilns and other harsh environments.

NBGs cables support Raman, Brillouin, Ralyeigh or FBG based interrogation technologies with Raman being the most common technique for cryogenic and high temp environments. The full metallic protection of the fibers ensure long lasting sensors by protecting the fibers from environmental influence and strain during operation.

Core Functionalities

Suitable for Raman, Brillouin, Rayleigh or FBG based technology

Fiber configuration based on customers requirements

High temp: Suitable of permanent temperatures up to 300°C

High temp: Fire detection where temperatures can reach > 600°C

Cryo: Suitable for temperatures down to -196°C

Single lengths up to 8km

Option to add hydrogen absorber for H2 rich environments

Optical connectors and accessories available

Products for Cryogenic / High Temp

Our Cryogenic FO cables are manufactured to customer specifications.
Below are just a few examples to demonstrate our production capabilities.

Sentire T Cryo Double Layer

Ultra-compact fiber optic sensor cable with superior crush resistance and operating temperatures down to -196°C. Available with 1 or 2 multimode fibers (MMF).

Sentire T Cryo Armored

Single Armored fiber optic sensor cable with great tensile strength, high flexibility and operating temperatures down to -196°C. Available with 1 or 2 multimode fibers (MMF).

Sentire T Cryo Double Armored

Double Armored fiber optic sensor cable with highest tensile strength for long distance pulling and operating temperatures down to -196°C. Available with 1 or 2 multimode fibers (MMF).

Additional Resources

Our High Temp FO cables are manufactured to customer specifications.
Below are just a few examples to demonstrate our production capabilities.

Sentire T150 Double Layer

Ultra-compact fiber optic sensor cable with superior crush resistance for operation temperatures up to 150°C. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Sentire T150 Armored

Single Armored fiber optic sensor cable with great tensile strength, high flexbility and operating temperatures up to 150°C. strength and excellent flexibility. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Sentire T150 Double Armored

Double Armored fiber optic sensor cable with highest tensile strength for long distance pulling and operating temperatures up to 150°C. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Sentire T300 Double Layer

Ultra-compact fiber optic sensor cable with superior crush resistance for operation temperatures up to 300°C. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Sentire T300 Armored

Single Armored fiber optic sensor cable with great tensile strength, high flexbility and operating temperatures up to 300°C. strength and excellent flexibility. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Sentire T300 Double Armored

Double Armored fiber optic sensor cable with highest tensile strength for long distance pulling and operating temperatures up to 300°C. Suitable for Raman, Brillouin or FBG based sensing technology. Up to 8 SMF and/or MMF.

Additional Resources

Frequently Asked Questions

What temperature range can be measured?

Sentire T Cryo cables operate across a temperature range from +40°C down to -196°C and can be directly submerged in liquid nitrogen. Sentire T150 and T300 are designed for operation from room temperature up to 150°C and 300°C, respectively, with short-term exposure to higher temperatures also possible.

Why are the fibers in a metallic encapsulation?

The metal tube provides optimal protection for the fibers against environmental influences, and the loose tube design ensures strain-free fibers even at operational temperature limits. Additional layers enhance crush resistance and tensile strength.

How can the tube be removed to get access to the fibers?

Stranding wires can be removed with pliers, while the tube can be cut using a pipe cutter or triangular file. NBG also offers a specialized tool that creates a corrugation on the tube, preventing damage to the fiber coating from burrs at the tube edge.

Are the sensing cables suitable for sour environments?

While the standard material for sensing cables is 1.4404 (316L), which has limited suitability for sour environments, NBG also offers nickel alloy options for these demanding applications.

Which single lenghts can be offered?

Single lengths of up to 8 km are available. The final length is determined by the customer’s order and delivered on a wooden drum with both ends accessible. Fiber optic connectors can be provided upon request.

Which interrogator unit is compatible with the cables?

NBG offers fiber optic sensing cables with fibers compatible with ITU-T G.652.D or ITU-T G.651 standards, ensuring compatibility with the majority of interrogators.

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