The Sonel MRU-21 Earth Resistance Meter is designed for measuring earthing systems and continuity of connections. It supports both 3-pole and 2-pole measurement methods, allowing for precise resistance measurements of earth connections and equipotential bonding, in compliance with EN 61557-4 standards. The device features an auto-zero function for measurement leads and can measure interference voltage, with selectable maximum measuring voltages of 25 V and 50 V. The MRU-21 is equipped with a large, easy-to-read display that provides resistance values and additional information, ensuring usability in various weather conditions. Its IP54-rated housing protects against splashes and harsh environments. The meter can store up to 990 measurement results, organized into 10 banks, which can be transferred to Sonel Reader software for further analysis. This instrument is suitable for use in industrial settings and by electrical measurement service providers.
Basic measurements of earthing systems and continuity of connections
The Sonel MRU-21 earth resistance meter is a simple meter which makes it possible to measure earthing with the use of the technical method and to measure the continuity of protective and equalising connections.
Characteristic features of this model include very simple operation, excellent resistance to interference and high measurement precision. The meter allows for earth resistance measurements with auxiliary electrodes using the 3p method, as well as 2p resistance measurements. The device is also suitable for testing the continuity of equalising and protective connections. The Sonel MRU-21 meter is dedicated to employees of the power and electricity industry.
Measurement methods
Additional features
Application
MRU-21 is designed as a reliable measuring instrument, which is both technically advanced and easy to use. It is suitable for tests in industrial plants and in companies providing electrical measurement services. MRU-21 allows user to test individual earth electrodes and systems with multiple earthing electrodes.
Capabilities
Large and easy to read display shows the resistance values and supporting information in all weather conditions. Additional warnings inform the user about irregularities during the measurement.
Housing with IP54 rating ensures safety in difficult weather conditions and protect the device against splashes.
The results can be saved to the device’s memory. It is divided into 10 banks of 99 cells, each corresponding to one measurement. These results can be easily transferred to the Sonel Reader software for archiving or subsequent analysis and research.
| Sonel Test | |
|---|---|
| Product Category | Ground Bond Testers |
| Product Number | WMUSMRU21 |
| Product Name | Earth Resistance Meter |
| Testing Method | Manual |
