Introduction
MULTI-POINT NETWORK CORRELATION
Enigma® loggers are deployed at multiple positions, typically on valves or hydrants, during normal working hours. They maybe 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 all leak positions between loggers.
Programming and data readback utilises optical and USB communications to ensure rapid operation.
Features and benefits at a glance
Optimum performance in difficult leak detection situations
Avoids costly night-time working
Three sound samples separate leakage from genuine water use.
Latest 24-bit digital correlation.
Low cost, high performance digital correlator.
Traffic friendly deployment.
Optimum leaks sensing
Overnight use provides ideal conditions for leak detection. This is because background acoustic noise from traffic, water usage and other sources, is lowest and, at the same time, water system pressure can be higher which greatly aids leak sound propagation.
System features:
Logger programming/readback via PC or one button press in the Communications Case
Loggers powered for 5 years
Advanced filtering and coherence functions
Unwanted noise suppression
Auto-velocity determination
Pipe schematic with correlation ‘thumbnails’ display
Each logger records during three sample periods, typically spaced one hour apart. A characteristic of leak noise is that it is always constant and so if the correlation peak is not present during all three samples then it is due to water use and not leakage.
