Copper sensor technology / "Nordic system"
The "Nordic system" for leak detection in plastic jacket pipes uses copper wires without insulation which are integrated into the insulation materials and detect penetration from moisture. This technology, which is still used to this very day, was introduced over 50 years ago. Depending on the supplier and batch it can be subject to heavily fluctuating measuring properties which are only reproducible to a limited extent.
In order for the "Nordic system" to even come close to meeting Brandes' demands, special line units and central units for automatic leak location have been developed.