- Description
Easy way to measure earthing and soil
The Sonel MRU-12 earth resistance and soil resistivity meter is a simple meter that allows you to measure grounding by the use of the technical method (3-pole and 4-wire) and soil resistivity by Wenner and Schlumberger method. The instrument is easy to handle, resistive to interference, and highly accurate.
MRU-12 is a basic device that allows for checking the quality of the grounding system on the basis of the received measurement result. Its ergonomic shape, durable and firm housing, as well as big and clear display make this instrument ideal to use both in the field and most working environments.
The device is simple to operate and intuitive. It is the best choice for electrical installations contractors, technicians, and professionals dealing with grounding measurements.
Measurement methods
- 3-pole and 4-wire method – measurement of earthing systems using auxiliary probes
- 2-pole method
- Earth resistivity – Wenner and Schlumberger method
Additional features
- Resistance of auxiliary electrodes RH and RS
- Measurement of interference voltage to 100 V
- Indication of battery state
- Selection of maximum measuring voltage (25 V and 50 V)
- Auto-OFF function
- In ground resistivity measurements, distances between electrodes can be input in meters (m) or feet (ft)
- Memory of 990 measurement results (10 banks of 99 cells each)
- Technical Specification
Measurement functions Measurement range Display range Resolution Accuracy Interference voltage 0 V…100 V 0 V…100 V 1 V ±(10% m.v. + 1 digit) Earth resistance 2-pole method 0.00…9999 Ω 0.00…9999 Ω from 0 0.01 Ω from ±(3% m.v. + 3 digits) 3-pole and 4-wire method 0.53…9999 Ω acc. to EN 61557-5 0.00…9999 Ω from 0 0.01 Ω from ±(3% m.v. + 3 digits) auxiliary electrodes resistance 0 Ω…19.9 kΩ 0 Ω…19.9 kΩ from 0 1 Ω ±(5% + 8 digits) Earth resistivity Wenner method 0.0 Ωm…999 kΩm 0.0 Ωm…999 kΩm from 0.1 Ωm Depends on the accuracy of the RE 4p measurement, but not less than ±1 digit Schlumberger method 0.0 Ωm…999 kΩm 0.0 Ωm…999 kΩm from 0.1 Ωm Depends on the accuracy of the RE 4p measurement, but not less than ±1 digit “m.v.” - measured value
- Standard accessories
- Optional accessories
- Files
- Firmware MRU-12changelog
Changes in version 1.02 compared to the previous one:
- Improved measurement in the RE3P method at interference voltages.
