. Data Collection and Communication Module
The WML leakage detection system caters aspects from reliable sensing to wireless transfer of events and sensing data in a secure fashion whilst utilizing an indigenously developed highly power efficient sensor board. For communication, our system utilizes ZigBee modules that can be connected to a standard UART connector. A latest ZigBee standard compliant transceiver can provide an outdoor range of 3200 m (2 miles), indoor range of 90 m (300 ft), transmit power of +18 dBm and receiver sensitivity of -102 dBm. A 2-cell 7.4 V Lithium Polymer Battery Pack is used with the high capacity of 13,500 mAh. The wireless sensor board is designed in such a way that it minimizes current leakages in circuitry which drains the energy of circuitry. The major component of this board is micro-controller, to which several integrated circuit components and interfaces are connected through different protocols . For pipeline infrastructure monitoring, a linear and hierarchical layout is required for sensor node deployment in whole network.