Art-Nr.: WMDEMRU200GPS
Sonel MRU-200 GPS Erdungswiderstandsmessgerät
| Measurement functions | Measuring range | Measuring range | Resolution | Accuracy |
|---|---|---|---|---|
| Interference voltage | 0 V…100 V | 0 V…100 V | 1 V | ±(2% v.Mw. + 3 Digits) |
| Resistance measurement of earth and equipotential bonding connections | 0,045 Ω…19,99 kΩ gemäß EN 61557-4 | 0,00 Ω…19,9 kΩ | ab 0,001 Ω | ab ±(2% v.Mw. + 2 Digits) |
| Earth resistance | ||||
| 3-pole and 4-wire method | 0,100 Ω…19,99 kΩ gemäß EN 61557-5 | 0,00 Ω…19,9 kΩ | ab 0,001 Ω | ab ±(3% v.Mw. + 3 Digits) |
| 3-pole + clamp method | 0,120 Ω…1999 Ω gemäß EN 61557-5 | 0,00 Ω…1999 Ω | ab 0,001 Ω | ±(8% v.Mw. + 3 Digits) |
| Two-clamp method | 0,00 Ω…149,9 Ω | 0,00 Ω…149,9 Ω | ab 0,01 Ω | ab ±(10% v.Mw. + 3 Digits) |
| Pulse method Pulse 4/10 μs, 8/20 μs, 10/350 μs | 0,0 Ω…300 Ω | 0,0 Ω…300 Ω | ab 0,1 Ω | ±(2,5% v.Mw. + 3 Digits) |
| Resistance of auxiliary electrodes | 0 Ω…19,9 kΩ | 0 Ω…19,9 kΩ | ab 1 Ω | ±(5% (RE +RH+RS) + 8 Digits) |
| Specific earth resistance | 0,0 Ωm…999 kΩm | 0,0 Ωm…999 kΩm | ab 0,1 Ωm | Dependent on the accuracy of the RE measurement in the 4p system, but not less than ±1 Digit |
| Leakage current | 0,1 mA…300 A | 0,1 mA…300 A | ab |
The Sonel MRU-200-GPS is a universal, high-precision measuring device for determining grounding resistance, grounding impedance and specific soil resistivity. It combines all common measurement methods in a compact, robust device – including an integrated GPS module for location-based result recording.
Ideal for use at hard-to-reach, weather-exposed or EMC-susceptible locations such as substations, lightning protection systems and overhead line masts.
Supported measurement methods
-
Impulse method (lightning protection testing)
Lightning current simulation according to EN 62305 (4/10 μs, 8/20 μs, 10/350 μs) -
3-pole & 4-wire measurement
High precision for classic grounding measurements with probes -
3-pole method + clamp
Ideal for multiple grounding systems -
Two-clamp method
Grounding measurement without probes – e.g. in urban environments -
Specific soil resistivity (Wenner method)
-
Continuity testing of grounding & equipotential bonding conductors ≥ 200 mA (EN 61557-4)
-
Measurement of leakage & fault currents with clamps
Performance features & additional functions
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Measurement accuracy up to 0.100 Ω
-
Measurement current > 200 mA – for reliable results even with industrial grounding systems
-
Calibration of clamps & test leads to compensate for intrinsic resistance
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Interference voltage testing & frequency measurement (mains: 16 ⅔, 50, 60, 400 Hz)
-
Selectable 25 V or 50 V test voltage
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Automatic conversion to Ω·m and Ω·ft
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Up to 990 measured values storable (10 banks × 99 memory locations)
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Real-time clock & GPS coordinate storage
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Bluetooth for wireless data transmission to app or PC
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Large, graphical display with intuitive menu
Expandable with accessories
-
Adapter ERP-1 for flexible clamp measurement
→ Perfect for overhead line masts, without disconnection work -
Sonel MRU Mobile App
→ Save, evaluate & forward measurement data directly at the point of use -
Sonel Reader Software
→ Archive, compare, create reports
Application areas
-
Lightning protection measurement according to EN 62305
-
Grounding testing in substations, transformer stations, industrial plants
-
Specific soil resistivity for geotechnical reports
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Continuity tests on equipotential bonding systems
-
Mobile measurement with GPS data for report documentation & traceability
Conclusion
The Sonel MRU-200-GPS is a powerful all-rounder for precise grounding measurements – especially where conventional methods reach their limits. Thanks to impulse testing, two-clamp method, GPS and app connectivity, it offers maximum flexibility and efficiency for
| Properties |
|---|
| Humidity max.: | 90% |
|---|---|
| electromagnetic compatibility (EMV): | EN 61326-2-2, IEC/EN 61326-1 |
| interface: | Bluetooth, USB 2.0 |
| measurement category: | CAT III 600 V, CAT IV 300 V |
| operating temperature: | -10°C - +50°C |
| protection rating: | Housing IP 54 |
| storage temperature: | -20 - +80 °C |
| Weight: | 2 kg |
| Width: | 288 mm |
| Height: | 223 mm |
| Measurement functions | Measuring range | Measuring range | Resolution | Accuracy |
|---|---|---|---|---|
| Interference voltage | 0 V…100 V | 0 V…100 V | 1 V | ±(2% v.Mw. + 3 Digits) |
| Resistance measurement of earth and equipotential bonding connections | 0,045 Ω…19,99 kΩ gemäß EN 61557-4 | 0,00 Ω…19,9 kΩ | ab 0,001 Ω | ab ±(2% v.Mw. + 2 Digits) |
| Earth resistance | ||||
| 3-pole and 4-wire method | 0,100 Ω…19,99 kΩ gemäß EN 61557-5 | 0,00 Ω…19,9 kΩ | ab 0,001 Ω | ab ±(3% v.Mw. + 3 Digits) |
| 3-pole + clamp method | 0,120 Ω…1999 Ω gemäß EN 61557-5 | 0,00 Ω…1999 Ω | ab 0,001 Ω | ±(8% v.Mw. + 3 Digits) |
| Two-clamp method | 0,00 Ω…149,9 Ω | 0,00 Ω…149,9 Ω | ab 0,01 Ω | ab ±(10% v.Mw. + 3 Digits) |
| Pulse method Pulse 4/10 μs, 8/20 μs, 10/350 μs | 0,0 Ω…300 Ω | 0,0 Ω…300 Ω | ab 0,1 Ω | ±(2,5% v.Mw. + 3 Digits) |
| Resistance of auxiliary electrodes | 0 Ω…19,9 kΩ | 0 Ω…19,9 kΩ | ab 1 Ω | ±(5% (RE +RH+RS) + 8 Digits) |
| Specific earth resistance | 0,0 Ωm…999 kΩm | 0,0 Ωm…999 kΩm | ab 0,1 Ωm | Dependent on the accuracy of the RE measurement in the 4p system, but not less than ±1 Digit |
| Leakage current | 0,1 mA…300 A | 0,1 mA…300 A | ab |