The cable system
The measuring systems implemented by ELD are based on the components of the manufacturer PROGEO Monitoring GmbH, Großbeeren, and belong to the geologger® product family.
The measuring method allows a full-surface and safe monitoring of the sealing. The measurements are fast and largely independent of the ballast or ongoing work above the geomembrane. The location of defects is very accurate.
The necessary cable technology is installed during the construction of the sealing. The measurement is carried out on these cables either with a mobile or permanently installed measuring device.
It is an electrical measuring method. An electrical signal is generated on one side of the geomembrane while a measurement is performed on the other side. Since the geomembrane is electrically insulating in itself, the signal can only be detected if a damage occurs.
This measuring method allows a direct inspection of the geomembrane.
Simple and durable
The durability of the installed cable technology is very high. For the system geologger® Carbon a durability of at least 30 years is confirmed within the scope of the BAM approval. Cables and measuring points are extremely robust and adapted to the loads in civil engineering.
The cables have an elongation capacity of over 10 % and can thus also absorb local settlements without damage.
The main components of the system are the measuring cables to be installed before the plastic sealing sheet is installed. These are unrolled and measured in parallel at intervals of several meters.
Due to the complete prefabrication of the cables, this work can also be carried out by the installer of the geomembrane or the construction company without hindering the construction process.
OFFLINE/ONLINE measurement technology
All cables are routed through the edge area of the liner into a switch cabinet, where they are connected. There are two possible operating modes:
OFFLINE: A mobile measuring device is connected to the cables in the cabinet to undertake the survey and then removed once the procedure is complete.
ONLINE: All cables are permanently connected to a detection device which is installed in the cabinet. The detection system is operated via a web server.
Analysis and display
The results are clear-cut and can be readily displayed in understandable form. The locations of any leaks are identified conspicuously and precisely.
The entire extent of a membrane can be inspected for the slightest leak with the help of this electrical technique. Thanks to interpolation, accuracy of the detection of leaks is significantly better than the actual interval between electrodes.