FCS PCorr+ User Manual Download Page 12

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Correlation requires that the loggers simultaneously record the sound from various 
points along the pipeline. Since the correlation process is very sensitive to time 
differences between the devices, the recording and the collection of the sound file must 
occur within a day (before the clock of each device has drifted far from its original 
accuracy).  

For the greatest positional accuracy, use of specialist correlation equipment that 
evaluates live audio is recommended

, such as HWM’s 

MicroCorr Touch Pro Correlator. 

With PCorr+, results are improved when the recording is made and collected as soon as 
possible after the scheduled recording is programmed. Always use a ground 
microphone to confirm the leak location prior to commencing repair works, such as 

HWM’s DXMic ground microphone

A scheduled sound recording needs to be programmed into each logger in the set. The 
procedure required to ensure the logger clocks are aligned will vary according to the 
application being used and also the model of patroller being used.  

Note:   The logger devices must have a patrol window available in order to be able to 

collect the sound files. The files must be collected without a reset of the logger 
(which disrupts the internal timekeeping of the device). 

4.2.1

 

Setup for Correlation Recordings 

 Method 1 

The USB Transceiver type of Patroller requires all loggers to be brought together (within 
radio range) and programmed as a set. Similarly, the loggers need to be brought back 
together as a set to download the audio. The time accuracy of each logger is checked by 
the app following file download to confirm it is OK for correlation use. This includes 
whether any of the devices have been reset since they were set up. 

Whilst the sound recording is pending, some normal logger operations are suspended, 
but will resume when the recording is completed. (See section 2.12.) 

4.2.2

 

Setup for Correlation Recordings 

 Method 2 

When the patroller being used to program the loggers has a high-accuracy time 
reference within it (e.g. Patroller 4, when GPS sync is OK), the possibility exists to set the 
clock within each of the loggers accurately, one at a time. 
(i.e. There is no need to gather them together; dependant on software support of this). 

Summary of Contents for PCorr+

Page 1: ...1 User Guide PCorr and Permalog Device description and uses Permalog PCorr MAN 031 0003 A...

Page 2: ...eak Evaluation Measurement History 8 2 10 Logger Device Scheduled Aqualog Measurement 8 2 11 Logger Device Sound Recordings PCorr only 8 2 12 Logger Device Scheduled Sound Recording PCorr only 9 2 13...

Page 3: ...s in designing the best leak detection equipment at an affordable price for the benefit of the water companies 1 3 SUPPORT OF PRODUCT This user guide covers the following product families of leak dete...

Page 4: ...more advanced analysis An Aqualog This is a set of up to 28 histograms made at regular intervals and used to analyse the consistency of noise measurements over a longer period The name originally ref...

Page 5: ...prise of A set of loggers PCorr or Permalog These typically are set to evaluate the sounds within a pipe overnight when water use is minimal and determine if a leak could be present nearby A Patroller...

Page 6: ...has a patrol window of 24 hours To compensate for power use the loggers transmit chirps less frequently Loggers with these settings can transmit to a fixed receiver installed near by This is sometime...

Page 7: ...to the antenna connector alternately flash after swiping Reset of the logger does not erase any measurement history Reset of the logger does temporarily re activate the radio link for approx 2 minute...

Page 8: ...ice can accept one off instructions to make an Aqualog noise histogram measurement or multiple measurements of a site No judgement of leak no leak is made by the logger following the measurement The m...

Page 9: ...file and determine when it was made To enable the automatic sound recording feature the loggers must have the Record automatically on new leak control set 2 12 LOGGER DEVICE SCHEDULED SOUND RECORDING...

Page 10: ...m the factory in an off state in a deep sleep mode where they are almost totally inactive to preserve the life of the battery Before first use they have to be started or woken up This is accomplished...

Page 11: ...Obtain synchronised sound recordings from several devices for correlation purposes one per PCorr logger The available options from the above list depend on whether they are supported by the app you a...

Page 12: ...roller being used Note The logger devices must have a patrol window available in order to be able to collect the sound files The files must be collected without a reset of the logger which disrupts th...

Page 13: ...nts of the pipe noise and evaluates if a potential leak exists The logger device is also set prior to installation to have a patrol window that matches the possible data collection times When within t...

Page 14: ...have the internal program firmware upgraded over the radio link The process should only be undertaken if advised by HWM The facility to do this may not be implemented on all apps Firmware changes requ...

Page 15: ...te College PA 6803 800 531 5465 sales fluidconservation com HWM Water Limited This document is the property of HWM Water Ltd and must not be copied or disclosed to a third party without the permission...

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