SubSurface Leak Detection Inc

- Advanced Digital Leak Detection System



ZCorr Digital Correlating Loggers (DCLs) pinpoint the exact locations of any leaks in one overnight survey. The easy-to-use ZCorr software provides the ease and accuracy of pipeline leak detection and pinpointing.

Put 8 ZCorr Correlating Loggers out in the afternoon and do an 'Overnight Survey'for water leak sounds at valves for hours late at night. Water main leak clearly apparent? Do a 'Short-term Recording' to Pinpoint it with just 2 or 3 ZCorr Correlating loggers on valves, hydrants, or meters nearby.

  • 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)

  • 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


  • 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 +140°F (-5 to +60°C)
  • Capacity: 3 to 8 DCLs
  • PC link: USB 2.0

  • 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 Can 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)


The downtown area of Sausalito, California is very busy with foot traffic, automobiles, restaurants, shops, and hotels from 6 AM until after midnight every day. Leak surveying and leak pinpointing for Marin Municipal Water District are almost impossible during these times.


Use ZCorr Digital Correlating Loggers to do an “overnight survey and pinpointing” on the main valves and hydrant valves along Bridgeway Avenue to detect any leaks.


ZCorr found a small leak (cut in top of pipe?) that was totally unknown on Broadway close to Princess Street.

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