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Fisher XLT-17 a Acoustic leak detector – geophone

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F2 of buried pipeline coating detection leak detector
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detection of hidden water leaks in underground pipelines, is based on the fact that the intensity of leakage noise and its frequency characteristic depends to a large extent on the size of the defect, the material of the pipe and the pressure in Pipeline. As the pressure increases in the water supply, the noise intensity increases and the frequency characteristics change. The assessment of these parameters and their measurement, allow to detect leakage and determine the exact location of water leakage. 
Fisher XLT-17 a Acoustic leak detector – geophone
To determine the location of hidden water leaks-search for water leaks under the ground-used electro-acoustic detectors, the principle of which is based on the listening and evaluation of noise generated by leakage. These devices consist of a sensor-accelerometer, transforming sound oscillations into electrical, measuring amplifier to measure electrical oscillations and head phones (headphones) to control the intensity and nature of noise. Some models are also equipped with a digital display that shows the intensity of leakage noise, expressed in db or conventional units. Electronic filtration of extraneous noises, for example, from passing vehicles or technological equipment, provides a great help in surveying the pipeline for hidden leakage.

Electro-acoustic leak is able to find hidden leaks on pipelines at depth of their occurrence no more than 3 m with an error up to 2 m, under condition of absence of acoustic and electromagnetic interferences. The density of the water leakage and, consequently, the possibility of its detection, is also influenced by the gravity of the soil. In dense soils the noise of leakage is more intense and is found easier.
Fisher XLT-17 Acoustic leak detector  -capable of detecting a leak of fluid in pipes and tanks, in four simple steps: Electronics amplify sound leakage, then choose filters noise audio leak, allocates and guides the player to the sound source.

Fisher Xlt-17 Noise With No Sensor Plugged In



Felix, please fix it. You can hear the noise every few seconds and see the graph going up and down for no apparent reason. The sound is not perfect as I had.