Enigma loggers are deployed at positions
either side of the suspected leak position (2 logger mode)
or with a third logger to improve accuracy of leak position
(three logger mode). They are deployed typically on
valves or hydrants, during normal working hours. They may
be programmed for either daytime or night-time operation.
The loggers record the actual leak sound. When retrieved
the leak sound is transferred to the host software where
it is processed to display the leak position between loggers.
Usage
of Enigma by Veolia's water team Clip from France
3Rhône Alpes television
station
Reporters: Frédéric LLOP,
Sandra MEALLIER