G.Re.T.A. is the most effective and innovative solution for Permanent Geoelectric Monitoring of the conditions of large sections of soil. This instrument measures the alteration over time of the soil’s resistivity profile, functional to the characterization of the same in terms of water content, presence of cavities or other anomalies.
Multielectrode Electric Tomography (ERT) is based on the insertion of an electric field in the ground through electrodes (input electrodes), and the measurement of the voltage is effectuated through other electrodes (measurement electrodes). From the measure of the voltage it is possible to obtain, through the second law of Ohm, the resistivity value, a peculiar characteristic of all materials.
| Max number of electrodes || 48 |
| Distance between the electrodes || 1 - 3 m |
| Measured profile lenght|| 47 - 142|
| Max measured profile depth|| up to 22 m|
| Electrodes|| For horizontal installation: one wing plate or picket|
For vertical installation: three wings plate
| Measurement configuration|| Wenner|
| Power supply|| Solar panel|
| Transmission|| Modem / router for automatic data|
| Control and configuration|| Remote via LSI LASTEM Cloud|
| Alarm management|| Based on pre-defined thresholds|