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ZCorr Digital Correlating Loggers

Download PDF of ZCorr Logger brochure (617KB)

Advantages of ZCorr Correlating Loggers

  • Performs correlations exactly like a correlator
    – Pinpoints exact distance to leak
  • Can operate at night in "Overnight Survey"
    – Less traffic and usage noise
  • Multiple loggers survey large areas for leaks
    – 8, 16, or 32 loggers over miles of pipe
  • Can turn "ON" multiple times with hours between recordings
    – Best chance to get leak sounds without usage noises
  • Can find smaller leaks at night
    – less traffic and usage noise
  • Even more sensitive than human ear
  • User can listen to the actual leak sounds for 60 seconds for each  recording (unfiltered)

ZCorr Sensor

  ZCorr Case of Sensors

Advantages of Automatic Leak Frequency Analysis (ALFA)

  • Accurate registration and pinpointing of each leak sound occurs automatically with every recording
  • Tracks the patterns of the leak sound over time to "tune in" to the true leak sound signal
  • Digital signal processing isolates (multiple) leak sounds individually at each logger, statistically optimizing their correlation at each possible value of time delay
  • No fixed high or low filters are needed for matching the audio frequencies at two correlating loggers
  • Can extract the true leak sounds from each recording even when louder noises are present at the same audio frequencies

The Solution is in the ZCorr Software

Analysis of All Correlations Found

Click a Thumbnail, See the 8 Best Correlations.

8 Best Correlations

Above: Many correlations at many loggers. One leak or many?

Click Listen. Logger No. 4 much louder (below).

Logger Number 4 louder

Click Play and listen to the leak for 60 seconds.

Correlation at 2:15 AM but not at 1:15 AM or 3:15 AM

Correlation at 2:15 AM but not at 1:15 AM or 3:15 AM. Answer: Usage at service

Sound Level Graph.

The Sound Level Graph (above) is for Logger no. 7 (high-lighted in the Leak Index Graph).
The Leak Index shows very little sound, and the Graph shows usage noise (meter) during the 2:15 AM recording.

Leak Index Graph

The Leak Index Graph (bars) shows good leak sounds at Loggers no. 1, 2, and 3.
The Sound Level Graph shows a very steady leak noise for Logger no. 3.


Technical Specifications ZCorr Digital Correlating Loggers


  • Enclosure: Aluminum, cylindrical
  • Protection: IP68, fully submersible
  • Dimensions: 2.25" diameter x 4.5" (5.7 cm x 11.4 cm)
  • Weight: 1 lb (450 g)
  • Mounting: Magnet, 40 lbs (18 kg) pull force • Operating temperature range: -20 to +140°F (-30 to +60°C)
  • Power source: Lithium battery, 5-year life,  factory-replaceable, non-rechargeable
  • Sensor:
    – High-resolution electronic accelerometer
    – Shockproof to 6,000 g
    – Sensitivity: 1 V/g
    – Resolution: 0.25 ?g /?Hz
  • Data Acquisition:
    – Frequency range: 1-3,000 Hz
    – Signal range: sub 1 ?g – 20 mg
    – Digital resolution: 20 bits


Docking Station

  • Enclosure: Rugged ABS carrying case
  • Protection: IP68 - cl osed; IP65 - open
  • Weight: 15 lbs (6.8 kg) without DCLs
  • Dimensions: 20.5" x 16.75" x 8.5" (52 cm x 42 cm x 22 cm)
  • Operating temperature range: +20 to +140F (-5 to +60C)
  • Capacity: 3 to 8 DCLs
  • PC link: USB 2.0
Download PDF of ZCorr Logger brochure (617KB)

Leak Dig


PDF of
ZCorr Logger

More ZCorr Information:

What are the Advantages of ZCorr
Field Application of ZCorr Loggers Download PDF of ZCorr Logger brochure (617KB)

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