Enigma 3m

An advanced correlating acoustic leak logger for pinpointing leaks remotely in metal pipes.


Remote correlating noise logger


The Enigma3m remote correlating noise loggers utilise 3G / GPRS communications to provide remote location of leaks in water distribution networks. The logger is deployed in underground chambers as part of a network of loggers, either permanently or "lift and shift", and requiring no costly above ground technology.
Features & Benefits At A Glance
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Pinpoints quiet, difficult-to-find leaks


Advanced accelerometer sensor

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Fewer loggers deployed per km of network


Innovative correlation analytics

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Clear, relevant data enables water companies to meet regulatory targets

Antenna below ground

The antenna transmits the acoustic signals from the logger coupled to the pipe below ground. Being underground means no planning permission is needed to install transmitters or repeaters, and vulnerable hardware is protected from damage or theft, which can occur on the street.

Enigma 3M deployed below ground for rapid leak noise correlation
Enigma3M Leak detection noise logger
Accelerometer sensor

The Enigma3m sensor is a sensitive acoustic piezoelectric accelerometer, which is coupled magnetically to the pipe. It detects and locates even quiet leaks in metal pipes remotely and very accurately over long distances, which means fewer loggers need to be deployed per kilometre of network.

Data analytics with Patented Technology

The Enigma3m is supported by the Ovarro data platform, PrimeWeb. This provides a database, analysis and online viewing facility for remote leaks in the network, as well as for flow and pressure. It is accessible on any desktop or laptop and displays live and historical data. Indicating accurate leak positions, together with ‘street view’ visualisation of the leak position, helps leakage teams manage their networks.

Leak noise correlation signals are transmitted accurately to the cloud analytics platform, PrimeWeb. Just 0.1 second fluctuation in the time synchronisation of two sound samples can cause 100m error in the location. To calculate accurately the location of the leak, synchronising acoustic sample signals is critical to pinpointing the position of the leak. Ovarro uses its original patented technique to ensure signals are synchronised and leaks are located with very high accuracy.
British patent number 2555053.


Primeweb cloud based data analytics for displaying leak locations in a water network

Sensor Sensitivity


Senor Frequency range

1 – 2500Hz

Sensor Attachment

Integral magnet

Sampling Measurement period

One epoch per night + up to 7 epochs multi-day correlation

Sampling Resolution


Sampling Data memory

8Mb static RAM

Local Communications Type



0.5 metre


Via Communications Module

3G / GPRS Communications SIM type

Embedded roaming SIM

Transmission frequency (audio+data)

Once per day


Penta band

Battery Type

Lithium Thionyl Chloride (non-rechargeable)

Operating life

5 years (dependant upon GSM signal strength and retries)

Waterproof rating

Robust aluminium enclosure to IP68 (submersible to 1 metre)

Operating temperature range

-20°C to 70°C

Dimensions (without antenna)

123mm x 58mm diameter (not including Enigma3hyQ sensor)


481 gram (not including Enigma3hyQ sensor)

Data storage

WAV files stored in Primayer Cloud


PrimeWeb operating on an internet browser (Chrome recommended)
Download Datasheet
Download Two Pager
Ovarro Enigma3m Remote Leak Pinpointing

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