Procedure of leak locating
HL5000 Devices for acoustic and tracer gas water leak location
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Benefits
- See and hear leaks with DSA technology
- High audio quality
- Non-tiring work
- Line location mode
- Improved leak identification with frequency analysis
Equipment to acoustically locate water leaks
How does acoustic leak location work?
With a damaged pipe, water streams out of the leak producing two types of noise:
1. The water flowing out of the pipe causes it to vibrate. With the Hydrolux and an attached microphone, you can hear these leak vibrations even at remote locations where contact with the pipe is possible (valve, hydrant, connection to a building etc.)
2. The water issuing at the leak location creates sounds which are transmitted through the ground to the surface. With the help of a ground microphone, the Hydrolux picks up these sounds and graphically displays the volume and the frequency spectrum.
The Hydrolux series of equipment
The modern DSP technology used together with a 16 bit audio codec provides the user with high audio quality. Background noise is simultaneously minimised. This means that leaks which only produce a quiet sound can also be reliably identified.
The Hydrolux is easy to carry even for longer periods of work due to the small housing and low weight. The large back-lit display provides easy reading of the measurement results. Hydrolux is simple to use which makes it a fine companion in your daily search for leaks.
With the modern series of Hydrolux equipment HL 5000 and HL 500, you can find leaks particularly quickly, easily and reliably. The equipment uses modern digital signal processing technology (DSP) to clearly recognise the leak sound, even when there is a lot of noise in the environment. The sounds are not just perceived audibly, but are also displayed graphically using ultra-modern dual segment analysis (DSA) technology. For the user this means more reliability when locating water losses.
Modern DSA technology for optimised leak
location
DSA technology stands for „dual segment analysis“. In a normal noise spectrum, background noise (cars, wind, passers-by, etc.) drowns out the actual sound of the leak. After calculation and evaluation the background noise is displayed as a narrow bar in the graph. The actual sound of the leak is identified by the minimum value, which is displayed as a wide bar in the graph. The nearer that you get to the leak, the higher this bar gets.
Line location mode
The HL5000 has a special mode to better locate plastic
pipelines acoustically. With this function, the equipment reacts
particularly sensitively to the impulse noises produced by a 'pipe pecker' or by an impulse generator. The filters are
automatically adjusted for this application. The enlarged drag
display is easier to read and thus eases the location of the
pipeline.
To find a leak, the pipe to be investigated is filled with tracer gas (forming gas - 5% hydrogen and 95% nitrogen) through a hydrant or house connection. This escapes from the leak and is precisely located at the surface. Owing to its low specific density and molecular structure, tracer gas has the particular characteristic of quickly penetrating all materials (concrete, tiles, tarmac etc.) and rising vertically, where it can then be detected using the HL 500 H2.
Due to its precise and quick reaction, the HL 500 H2 is ideal
for accurately locating even the smallest of leaks.
The integrated sound logger
Final certainty is provided by the unique long-term measurement
from the HL5000. Put the microphone over the suspected
leak location. The long-term measurement records the
sound for 30 minutes (as an example). If the valve for that
section of the pipeline is closed, that should result in the sound
of the leak diminishing. If that is not the case, it's not a leak. An
expensive pointless dig has thus been avoided.
The histogram measurement - See and hear leaks
Forget about reading numbers. With histogram measurements,
in future, you can both hear and see the leak. Up to nine
measurements are saved and displayed as a DSA sequence
with this function. The narrow segment shows the level of
background noise, the wide segment shows the sound of the
leak. The leak is there where the wide segment is highest. You
can't get clearer than that!
The classical listening function
The advantages at a glance:
- DSA technology: simultaneous display of the current
and minimum values
- Hear and see leaks: Histogram measurement with
9 simultaneously displayed DSA measurements
- Low weight - non-tiring to use
- High audio quality - Completely digital 16 bit audio
codec
- Large display to easily read the measurement results
- Frequency analysis of the recorded sounds (HL5000)
- Flexible filter settings with 9 freely confi gurable filter
curves (HL500)
- Sound logger function: 3-15-30 minutes (HL5000)
The classical display of the listening function has also been
optimally adapted the user‘s requirements in the Hydrolux
series. Maximum and minimum sound levels are clearly
displayed as a DSA graph. The drag display function eases the
job of acoustically locating plastic pipelines, using the pipe
pecker RSP3.
Frequency analysis and filter selection
The HL5000 analyses a frequency spectrum from 0 – 4000 Hz.
Every leak has a particular frequency pattern. Select the right
fi lter settings yourself, to pinpoint the leak exactly. In this way
you can simply fade out interfering background noise. As an
alternative, the HL500 offers ten preset fi lter settings from which
you can select the ideal one.
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