How does Zonescan-800 work?

Deployed throughout the water distribution network at regular intervals (often attached to valve spindles or fire hydrants via the integrated magnetic base), the Zonescan-800 'leak intelligence units' continuously monitor and analyse noise characteristics within the distribution system and can detect and identify the presence and location of a leak. Once in range of a Zonescan-800 logger, a patrol operator will receive automatic notification from the systems voice embedded host software, first identifying the unit, before announcing the presence or probability of a leak at that point in the water network. If audible confirmation of the leak noise is desired, the operator can, at any time, listen directly to the digitally transmitted leak noise from his vehicle without the need for any physical connection with the loggers.

GPS positioning & GIS integration
The Zonescan is now available with precise GPS plotting of each logger at time of deployment. Additionally, the data from the entire Zonescan project (including full leak pinpointing) can be sent by GPRS, to be automatically integrated to a GIS or Google Earth programme.

Zonescan A.L.P.H.A. Remote Water Leak Monitoring & Pinpointing

To receive an example of an automated Zonescan ALPHA generated Short Message Service (SMS) Leak Alarm, please visit the link below and enter your mobile phone number.

ZONESCAN-800 loggers function in a similar manner to standard (flow & pressure) loggers, in that they “wake up” to take recordings at user programmable times and also when interrogated by the host software (via a PC or PDA device). At all other times the loggers remain “asleep” to conserve the battery life. Based on a typical operational pattern of one full download every 10 days, they will operate continuously for 5 years before requiring battery replacement.

A Fully Programmable Acoustic Logger
ZONESCAN 800 loggers can be individually or collectively programmed to suit each and every different location and environment. The 'industry standard' setting of 02:00am to 04:00am at 3 second sampling is easily achieved as Zonescan can log up to 23 hours and 59 minutes at any sampling rate from 1 to 180 seconds. These results are then presented in an easy to read format by the Windows based host software.

By utilising longer recording periods combined with rapid sampling, the ZONESCAN 800 equipped leakage engineer eliminates the phenomenon of “ghost leaks” and the considerable time wasted attempting to pinpoint leaks that don't exist. Other, inferior acoustic loggers have been proven to waste up to 50% of costly detection time looking for “ghost leaks”, especially in heavily populated town and city districts.

ZONESCAN 800 loggers have a 100mW transmission power output, compared with the 3-10mW outputs of inferior radio loggers. This enables the patrol vehicle to interrogate and download the loggers from up to 250 metres away.
The operator chooses the 'type' of patrol via the Zonescan's host software according to local geographical restrictions. In tests Zonescan offered an average 'patrol' of 72 loggers downloaded and/or programmed per hour, compared with only 28 loggers achieved by other types of radio logger.

The Smallest, Robust & Highly Portable Logger
At only 115mm high, with a flexible carrying handle that houses the aerial, and with an all round alloy casing, the ZONESCAN 800 logger is the smallest, lightest and most robust logger available. Other radio loggers that have either fixed plastic aerials or plastic housings, or both, are prone to operational damage e.g. when chamber covers are replaced and press down on the aerial, or when leakage inspectors accidentally puncture the logger casing with listening sticks. Weighing less than 0.4kg each, ZONESCAN 800 loggers are easily transported and deployed by one engineer.

Logged results are displayed in the software database as a 'Project Table'.
Each result is given as a “Leak Value” between 0 and 100 for initial interpretation. This Leak Value is determined by the level and occurrence of the logged decibel readings. The operator sets the 'Leak Value threshold' within the host software. This determines whether the result is indicated in red (caution, probable leak), orange (possible leak) or green (no leak). The same threshold is also used for triggering the audio warnings if required.

The Leak Value can be used to prioritise detection/confirmation tasks. For example, with the Leak Value threshold set to '30', quiet, low volume leakage (such as weeping fire hydrants and passing boundary valves) may still be highlighted in 'orange' in the project table, along with greater volume leaks. With the threshold set to 50, these lower volume/priority leaks will be coloured 'green' in the Project Table and will not trigger a leak audio warning to the patrol engineer. Because the patrol operator sets this threshold level based on his local knowledge of the network, different logged areas with different average pressures and pipe materials can be patrolled with improved effectiveness and efficiency.

The logged decibel values for each logger are displayed in the Measurements Graph. Each logger has a revolving memory that will retain 30 days of measurements graphs and 180 days of Leak Values, with the oldest value being overwritten when the memory is full. The storage of historic information is only limited by the host PC’s memory. An “acoustic fingerprint” can be built up and viewed in the Measurements window allowing a degree of local asset appraisal to be carried out.

A) Project Table	B) Measurements Graph

Each ZONESCAN 800 Project Table can contain an unlimited amount of loggers.
A different 'Zonescan Project' is recommended for each specific D.M.A./L.C.Z. as this can assist in patrol planning and data management.
Each Project can be saved separately as a ZIP file for archiving and/or emailing.

A Digital Leak Locating Correlator
in addition to noise logging, each ZONESCAN 800 logger can ALSO be independently programmed to record a sample of actual pipe noise at any time of the day or night, and this is performed during synchronisation (programming or downloading). This noise sample is then digitised and stored in the logger’s memory for onward transmission when the logger is interrogated by the host software platform. These digitised noise files are stored in the Noise Signals section of the ZONESCAN800 software to enable cross correlation between loggers to pinpoint the source of the leak noise between any two loggers.

Simply selecting any two loggers from the Project Table, then clicking on the 'Correlate' icon, enables the user to conduct a cross correlation. For exacting accuracy, pipe details can be entered and the graph will then indicate the precise distance of any leak in relation to the first logger selected.

NEW AUTOMATIC MULTI-TEST CORRELATION BETWEEN ALL LOGGERS IN THE SAME PROJECT!

Zonescan software now offers the user another world first. By simply selecting a dedicated 'test correlation' icon within the Zonescan's correlation programme, the powerful host software will perform a test correlation between ALL loggers within the same project. Using specific correlation formulae, the Zonescan-800 will then provide the user with a list of all the highest probable leak positions - at the click of a button!