MRU-30 Earth Resistance and Resistivity Meter

 

  • It allows to take the measurements of:

    • earthing resistance using auxiliary electrodes,
    • earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),
    • earthing resistance using double clamps for measuring multiple earthing without underground connections.
    • 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.

The Sonel MRU-30 uses most known methods of earth resistance measurements. Tests can be performed using the 3-pole, 4-pole, 3-pole with auxiliary clamp and also, additionally, the MRU-30 employs the two clamp method of measurement, without the use of auxiliary test rods which can’t be used in some situations. Complementary features of the MRU-30 are measurements of soil resistivity, continuity measurement of protective and equipotential conductors and, using clamps, leakage currents and interference voltages.

  • Robust and weatherproof (IP65) – no ingress of dust, water protected by a nozzle against enclosure from any direction.
  • Ergonomic casing – small and handy casing to make the measurements more convenient than before.
  • Built-in rechargeable battery – saving time to replace flat batteries; can be recharged from Power Bank and Cigarette Lighter Socket!
  • Clear on-screen notes – displayed on screen before and after the measurement to alert user of possible dangers and irregularities.
  • Many measurement methods available in a small, portable casing

Measurement of interference voltage UN (RMS)

RangeResolutionAccuracy
0…100 V1 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

RangeResolutionAccuracy
0,00…9,99 Ω0,01 Ω±(2% m.v. + 3 digits)
10,0…99,9 Ω0,1 Ω
100…1999 Ω1 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)

RangeResolutionAccuracy
0,00…19,99 Ω0,01 Ω±(3% m.v. + 3 digits)
20,0…199,9 Ω0,1 Ω
200,0…1999 Ω1 Ω±5% m.v.
2000…9999 Ω1 Ω±8% 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)

RangeResolutionAccuracy
0,00…19,99 Ω0,01 Ω±(3% m.v. + 3 digits)
20,0…199,9 Ω0,1 Ω
200…1999 Ω1 Ω±5% m.v.
2000…9999 Ω1 Ω±8% 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

RangeResolutionAccuracy
0…999 Ω1 Ω±(5% m.v.+ 8 digits)
1,00k…9,99 kΩ0,01 kΩ
10,0k…19,9 kΩ0,1 kΩ

 

Measurement of multiple earthing resistance with using double clamps

RangeResolutionAccuracy
0,00…19,99 Ω0,01 Ω±(10% m.v. + 8 digits)
20,0…99,9 Ω0,1 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

RangeResolutionAccuracy
0,00…9,99 Ωm0,01 Ωmdepending on measurement
accuracy RE with 4p method,
but not less than ±1 digit
10,0…99,9 Ωm0,1 Ωm
100…999 Ωm1 Ωm
1,00…9,99 kΩm0,01 kΩm
10,0…99,9 kΩm0,1 kΩm
100…999 kΩm1 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,
  • measurement 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.

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