Earth Resistance & Resistivity Tester MRU-120

Multifunctional earthing resistance meter

With the use of the presented earth resistance and soil resistivity meter Sonel MRU-120 it is possible to carry out earth resistance measurements using 3-pole and 4-wire method, measurements with the use of additional clamps (multiple earthing - without the necessity of unfastening the monitoring connections), as well as measurements using two-clamp method - in some cases it is possible to carry out the measurement without the necessity of using auxiliary probes driven into the ground. Sonel MRU-120 is a device designed to meet the needs of the power industry and used for earthing measurements - measuring range (measurements in accordance with PN-EN 61557 standard) from 0.30 Ω. The functionality of the device is completed by the possibility to measure the resistivity of soil and the continuity of protective and equalising connections.

Measurement methods

• 3-pole and 4-wire method – measurement of earthing systems using auxiliary probes
• 3-pole method with clamp – measurement of earthing systems with multiple earth electrodes
• Two-clamp method – measurement of earthing system when the auxiliary probes cannot be used
• Soil resistivity – Wenner method
• Resistance of earth connection and equipotential bonding measured using current ≥200 mA with auto-zero function – meets the requirements of EN 61557-4

Application

MRU-120 meter was created for the most difficult working conditions. It generates a measuring current exceeding 200 mA, which provides effective measurements of grounding of energy objects such as transformer stations and power stations.

Thanks to the methods using clamps, it is not necessary to disconnect the control connectors, which is sometimes a very tedious operation. This plays a special role when performing works on objects exposed to weather conditions, where the connecting elements are sometimes corroded or tarnished. The graphical user interface provides clear readings and explicit messages. This translates into quick, trouble-free service.