Cross Hole Ultra sonic Monitor


The CHUM (Cross Hole Ultrasonic Monitor) uses the Crosshole Sonic Logging, CSL testing method to perform high-resolution quality control of deep foundations.

The system uses an ultra sonic wave sent from a transmitter to a receiver pulled through water filled access tubes embedded in the concrete. The measured arrival time and energy are strongly dependent on the concrete quality. [ How to test a pile using the cross-hole ultrasonic method? ]

Additional methods supported by the CHUM are Single Hole Ultra sonic Testing (SSL/SHUT) and Tomography (two- and three-dimensional).

The CHUM is fully compliant to ASTM D6760 – 16, AFNOR NF P 94-160-1 and additional standards

What are the advantages of CHUM?

Easy to use

  • Usually, no training is needed, and the system can be self-taught in hours. (No expensive training days) “Very, very easy to use…”


  • 2D tomography (included).

  • 3D tomography provided as a service

  • Three alternative tomography methods: Fuzzy logic, Parametric and 3D

  • In real-time tomography: the shape of the defects forms as the probes are pulled

Modular design

  • CHUM connects to any PC via the standard USB port. It will connect to future computers (such as Origami)  while embedded systems will quickly become outdated.
  • Why this is so important to me?
  • Reliable
    • 100% QA tests at 16 atmosphere pressure, vibration and extreme temperature
    • The CHUM case can tolerate drops and shocks
    • 3 years warranty!
    • Rugged connectors, PU cables and details.

    “The CHUM operated perfectly in -17°c

Devoted service

  • Free software support and updates (included)

  • Analysis, interpretation, and reporting assistance (included). We will do/review your first reports to make sure they are up to the highest standards.

  • Performance
    • Up to 150m (450′) deep (deeper optional)
    • Clean signal on 3m and more on solid concrete
    • Cleanest signal in the industry
  • High productivity
    • One experienced person tests about 700m of sections per hour!
    • 40 samples/sec: test as fast as 2m/sec !
    • Fully automated reports in MSWord format
    • The whole system fits into a carry-on luggage. (50m cable drums)

    “We just tested 4000m of CSL sections in one day!”
    Middle east

  • Unlimited software licenses
    • No plugs, no registration, no  need to type in long product ID, no “software transfer fees”.
    • Install the fully functional software as many times as you need.


Why is CHUM using my computer?

Unlike other systems, CHUM connects to any PC using the USB port, to form a powerful CSL system.

Advantages of this modularity concept:

My Laptop Embedded system
Always updated Always outdated
Easy, local support Send remotely (downtime!)
Seamless upgrade Send remotely (downtime!)
No data transfer needed Slow, cumbersome cables and utility
Easy to use learning curve!
Less systems to maintain An additional system to maintain (Higher TCO)
Your local language US English only

Save money and start testing with your current laptop. Once the market picks up – get a dedicated tablet PC.


•ASTM D6767

•AFNOR NF P 94-160-1


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