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Acoustic logger

Posted: Wednesday 20th November 2013

By simultaneously measuring the level and frequency of noise in water supply networks, the new Sebalog N-3 acoustic loggers from Megger provide a convenient and dependable way not only of detecting leaks, but also of determining their approximate location.

Equally suitable for temporary or permanent installation, the Sebalog N-3 loggers use a wireless link to communicate with a portable Sebalog Commander-3 evaluating unit over a range of up to 80 m. Wireless range can be extended with a repeater. Alternatively, data from up 50 loggers can be collected automatically by an optional network box and transmitted to a monitoring station via the GSM mobile telephone network.

The loggers monitor noise in the water supply network and store the audio data for up to 100 days. Historical and realtime data can be retrieved with the Commander-3 evaluating unit, where it is processed using Megger’s innovative Enhanced Spectrum Analysis (ESA) to eliminate spurious acoustic signals and to give an accurate indication of leak probability. For added operator convenience, the Commander-3 display highlights unusual measurements in colour.

It is also possible to retrieve the audio data without processing, allowing users to listen to the actual noise signal picked up by the logger. In addition, for users who prefer to analyse data from Sebalog N-3 loggers using a PC, an intuitive software package is available which offers facilities similar to those provided by the Commander-3 evaluating unit.

Sebalog N-3 loggers, which incorporate a strong magnet to facilitate secure installation, are compact cylindrical devices measuring just 115 mm long x 45 mm diameter. They have an IP68 ingress protection rating and an operating temperature range of -20 to +60 ºC, making them suitable for use in even the toughest of environments. Power is provided by replaceable internal Li-ion batteries that have a life of more than five years under normal operating conditions.

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