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MRU-30

Catalog index: WMGBMRU30

Earth Resistance and Resistivity Meter

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Universal earth tester

The Sonel MRU-30 compact earth resistance and soil resistivity meter enables efficient and easy earth resistance measurement. Many measurement methods available in a small casing.

The MRU-30 meter is surprisingly versatile in nature. The instrument can be used to perform single earthing measurements as well as multiple earthing measurements using additional clamps or electrodes. Additional capabilities of this handy device include measurement of soil resistivity using the Wenner method, as well as verification of the continuity of equalising connections and protective conductors. Another advantage of the Sonel MRU-30 meter is the clear transmission of information alerting the user to possible dangers or detected irregularities. Information appears on the screen both before and after the test.

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
  • Earth resistivity – Wenner method
  • Resistance of earth connection and equipotential bonding measured using current ≥200 mA with auto-zero function – meets the requirements of IEC 60346-6-61>

Features

  • Measurement of auxiliary electrode resistances RS and RH
  • Measurement of interference voltage
  • Measurement in the presence of interference voltages in networks with frequencies of 50 Hz and 60 Hz
  • Selection of maximum measurement voltage (25 V and 50 V)
  • In ground resistivity measurements, distances between electrodes can be input in meters (m) or feet (ft)

Application

The MRU-30 earth resistance meter is designed to measure single and multiple earthings using auxiliary electrodes and/or clamps. Moreover it is possible to measure ground resistivity (Wenner method) and verify the continuity of equipotential bondings and protective conductors.

Capabilities

The meter provides the ability to make grounding tests with all kinds of the technical method. High immunity to interference allows it to be used even in difficult conditions in circuits with interfering currents. Simple and intuitive operation makes the measurements easier and faster. The meter has internal memory. The measurement results can be transmitted to a computer for data processing and preparation of documentation from the grounding tests.

Durable and practical casing

Ergonomic, small and practical housing allows comfortable and easy operation. The meter is resistant to all weather conditions. IP65 ingress protection guarantees dustproof and resistance to water jets on each side. The battery is permanently built-in and can be charged from a PowerBank or car cigarette lighter.

Specification

It allows to take the measurements of:

  • earthing resistance using auxiliary electrodes,
  • selective earth resistance measurement with Clamp (no influence from parallel earth, no opening of rusty junctions if needed
  • earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),
  • earthing resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
  • ground resistivity (Wenner method),
  • continuity of equipotential bondings and protective
  • conductors (meeting the requirements IEC 60364) with auto-zero function – with current 200mA.

Additionally:

  • measurement of resistance of auxiliary electrodes RS and RH,
  • measurement of interference voltage,
  • measurement in the presence of interference voltage in the power network
  • with frequency 50Hz, 60Hz,
  • selection of maximum measuring voltage (25V and 50V),
  • introducing the distance between the electrodes for the resistivity in metres (m) and feet (ft),
  • memory of 990 measurements (10 banks of 99 cells each),
  • calibration of clamp used,
  • data transmission to the computer (USB),
  • indication of battery state.

Measurement of interference voltage UN (RMS)

Range Resolution Accuracy
0…100 V 1 V ±(10% m.v. + 1 digit)

Measurement of continuity of equipotential bondings and protective conductors (Rcont)
measurement range to IEC 61557-4:2007: 0,13 Ω…1999 Ω

Range Resolution Accuracy
0,00…9,99 Ω 0,01 Ω ±(2% m.v. + 3 digits)
10,0…99,9 Ω 0,1 Ω
100…19.9K Ω 1 Ω

• measurement current: under short circuit >200mA
• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz (for networks 60 Hz)

Measurement of earthing resistance (method 3- and 4-pole)
measurement range to IEC 61557-5:2007: 0,53 Ω…9999 Ω (dla 50 V)

Range Resolution Accuracy
0,00…19,99 Ω 0,01 Ω ±(2% m.v. + 3 digits)
20,0…199,9 Ω 0,1 Ω
200,0…1999 Ω 1 Ω ±2% m.v.
2000…19.9K Ω 1 Ω ±2% m.v.

• measurement current: under short circuit >20 mA,
• voltage on open terminals: selectable 25 V AC or 50 V AC,
• frequency of measurement current: 125 Hz (for networks 50 Hz) or 150 Hz (for 60 Hz).

Measurement of multiple earthing esistance with using the clamp and auxiliary electrodes (3p + clamp)

Range Resolution Accuracy
0,00…19,99 Ω 0,01 Ω ±(2% m.v. + 3 digits)
20,0…199,9 Ω 0,1 Ω
200…1999 Ω 1 Ω ±2% m.v.
±2% m.v.

• voltage on open terminals: selectable 25 V AC or 50 V AC,
• measurement current: under short circuit >20 mA,
• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz (for networks 60 Hz)
Measurement of resistance of auxiliary electrodes RH i RS

Range Resolution Accuracy
0…999 Ω 1 Ω ±(5% m.v.+ 8 digits)
1,00k…9,99 kΩ 0,01 kΩ
10,0k…19,9 kΩ 0,1 kΩ

Measurement of multiple earthing resistance with using double clamps

Range Resolution Accuracy
0,00…19,99 Ω 0,01 Ω ±(10% m.v. + 8 digits)
20,0…99,9 Ω 0,1 Ω ±(20% m.v. + 3 digits)

• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz
(for networks 60 Hz)

Measurement of ground resistivity
Measurement method: Wenner, ρ=2πLRE

Range Resolution Accuracy
0,00…9,99 Ωm 0,01 Ωm depending on measurement
accuracy RE with 4p method,
but not less than ±1 digit
10,0…99,9 Ωm 0,1 Ωm
100…999 Ωm 1 Ωm
1,00…9,99 kΩm 0,01 kΩm
10,0…99,9 kΩm 0,1 kΩm
100…999 kΩm 1 kΩm

L – distance between probes: 1…50 m.. or 1…150 ft

Electric security:

  • type of insulation: double, according to EN 61010-1 i IEC 61557,
  • mesurement category: CAT III 300V wg EN 61010-1,
  • protection class acc. to EN 60529: IP65,

Rated operational conditions:

  • operation temperature: -10…+55°C,
  • storage temperature: -20…+80°C,
  • humidity: 20…90%,

Other technical data:

  • LCD display: segment, backlit,
  • dimensions: 200x150x74 mm.

Files to Download

Datasheet

User Manual

Declarations of conformity

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