SePem 100 / 150

Noise logger for monitoring water distribution networks: robust – practical – reliable

Early detection of water leaks

Leaks in water distribution networks can cause considerable water loss. Thanks to the systematic monitoring of the network with the SePem® data loggers, you identify existing leaks reliably, and detect new leaks early, much faster than with current methods.

Leak location system

The SePem® system includes the SePem® 01 Master receiver as well as a group containing as many noise loggers as desired, the SePem® 100 being preferably intended for mobile use and the SePem® 150 for permanent use. They are placed magnetically on the valve stems or on the hydrants or any other valve element of the pipe network. The microphone integrated in the logger transforms the structural noise of the pipe into a sound signal. This is regularly recorded during low-power slots, usually at night between 2:00 and 4:00 a.m., when no or almost no extraneous noise is present in the environment. On a leak-free pipe, the noise level measured over this period is almost zero. In the event of a pipeline leak, the noise logger measures values that are clearly different from zero, and thus detects the existence of a leak.

SePem® 100: Data logger for mobile use

For mobile use in a water supply network, the SePem® 100 data loggers with integrated antenna are the ideal devices. They are placed at measurement points on a given section of the network, on the fittings, and record the noise during the night, over a programmable time slot (usually half an hour). The following day, the loggers are collected. The measurement data is transmitted by radio to the SePem® 01 Master . High measured values, which indicate a leak, are immediately indicated by an acoustic signal. This method allows existing leaks to be detected. Finally, data loggers are placed on successive sections of the network, until the entire network has been verified.

SePem® 150: Safety through permanent monitoring

SePem® 150 data loggers are designed for stationary monitoring of water distribution networks. They are equipped with an external antenna and are fixed to the fittings. The SePem® 150 record the minimum noise level every night over a programmable time slot (for example for half an hour). The sites are surveyed periodically (daily or weekly) by the passing vehicle, during which the noise loggers send their data telegrams to the SePem® 01 Master . Contrary to mobile use, it is not the absolute level heights between two measuring points that are measured, but the relative variation of the sound level at the level of a measuring point, which makes it possible to quickly detect the occurrence of another leak.