Sonitec™ CSL tube system

Sonitec ®

Easy-to-install sonic tube system for CSL

Sonitec is a tube solution invented to facilitate the integrity testing of foundations using the CSL testing method.

CSL (Cross Sonic Logging) method allows to determine the structural integrity and homogeneity of concrete within diaphragm walls, bored piles, drilled shafts, barrettes, concrete piles or augercast piles.

CSL method requires a transmitter and a receiver to be inserted in parallel water-filled tube down the pile depth in order to propagate and measure the speed of ultrasonic pulses.

Sonitec system have been designed for the sole purpose of facilitating the assembly and installation of long tube lengths in reinforcement cages.

Sonitec has been for more than 20 years the preferred solution of piling and general contractors worldwide to safely and quickly deliver a perfect CSL testing environment.

CSL testing process with Sontitec

Product features

  • Sonitec are based on thin black steel tubes available in different diameters and thicknesses. Our standard length is 5.80 meters.
  • Instant connection. A convenient enlarged bell-mouth allows the connection of 2 tubes seamlessly, thus greatly reducing labor cost and project schedule.
  • Waterproof design up to 240 meters. The PUSH-FIT system connection between the mouth and rubber gasket ensures a concrete-tight joint that will maintain the tube integrity and prevent the entry of foreign material. Our tubes are 100% verified in factory for leakage.
  • High loading capacity steel ears welded at regular spacing to tie and lock two tubes together.
  • Compliant with ASTM D6760, the standard method for integrity testing by ultrasonic cross-hole testing.



100% factory tested
100% factory tested
For leakage at our factory
Instant reconnection
Instant reconnection
by hand, no welding.
million meters
2 million meters
installed worldwide each year


  • Simply the fastest way to build a CSL testing environment.
  • Safe reconnection. No special tooling and no welding required.
  • Especially recommended for the assembly of prefabricated cages which
    have been previously equipped with Sonitec tubes.
  • Rigid and robust tube connections, high resistance to shocks.
  • The O-ring is installed inside the pipe and fully protected from UV and
  • For more advanced applications, additional accessories and FRP tube
    version also available. Please refer to documentation.


At every moment of your customer journey, Dextra teams dedicate themselves to the making of smart construction solutions that allow our customers to reach higher productivity and safety level on their construction sites.

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Network & Services

Network - Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra make sure our products are always at reach and available in reasonable times.

Delivery - For solutions which required to be customized for each project, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

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Manufacturing capabilities

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China) and Mumbai (India), Dextra completely owns its manufacturing facilities and processes. This allows us to have complete control over the timing of our operations and the quality of the solutions produced.

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Testing facility

An independently accredited material testing laboratory, accredited to ISO-IEC 17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

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Quality & Certifications

Dextra aims to supply products that exceed the most demanding international technical approvals and it is our goal to create maximum customer satisfaction by complying with our clients’ needs and specified requirements.

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