PermaNet+ Trunk Main system


The PermaNet+ Trunk Main system from HWM combines high performance Hydrophone sensor and versatile telemetry data technology to create a continuous monitoring system for sensitive pipelines.

PermaNET+ TM is fully compatible with PermaNET Web, the online data viewing and analysis platform, combining to provide map-based display, GIS interface and full audio and correlation facilities.



Once installed, leak data, calculated using the proven Permalog algorithm, and secondary data is transmitted via low cost GPRS or SMS telemetry. This removes the requirement for expensive site visits and “drive-by” data retrieval.

PermaNET+ TM transmits data through an integral modem with GPRS/2G, 4G, LTE-M (Cat-1) and other NBIoT cellular options available.

PermaNET+ TM allows leakage teams to monitor the status of each deployed logger from map based host software using any internet enabled device.

Leaks are identified immediately and once the presence of a leak has been identified, secondary measures can be used to check and remove 'false positives' and also to localise the leak position.

Key Features and Benefits

  • High performance hydrophone: better performance over long pipe lengths, large diameter pipes and plastic pipes
  • Frequent logging: establishes the noise profile and profile alarms for precise immediate leakage alarms
  • Determine leak size: by matching daily alarms with flow data to enable prioritisation of leak alerts
  • Telemetry: NBIoT LTE-based cellular communication standard with fallback 2G capability
  • Precise logging: ability to log noise more frequently to establish the noise profile and profile alarms for precise immediate leakage alarm
  • Secondary validation:
    • Aqualog - detailed noise histogram to reduce 'false positives'
    • Audio - remotely listen to the noise
    • Remote correlation to localise leak position
  • Fully waterproof: the IP68 rating has been tested at 10m depth over a 24 hour period
  • PermaNET Web: software supports: -
    • Correlation
    • Map view
    • Aqualog
    • Select GIS file formats
    • Remote configuration
    • Filtering
  • Easy to use: compatible with the HWM Deployment app and can also be programmed through PermaNET Web
  • External antennas: support improved signal strength (contact HWM for more information)
Noise HWM high performance Hydrophone sensor
Clock On board 24 hour real time clock with date facility
Automated synchronization
Serial USB Cable for connection to PDA hand held programming and data collection unit, laptop, or desktop PC

Logger without antenna = H = 86mm, W = 115mm, D = 114mm

LNS: H = 110mm, W = 85mm, D = 72mm


 Logger = 338 grams

Leak Noise Sensor= 586 grams

Operating Temperature   

Logger: -20 to +60°C (-5 to +140°F)

Hydrophone: -20 to +60°C (-5 to +140°F)

Ingress Protection IP68 submersible