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MRU-30 Earth Resistance and Resistivity Meter

Regular price $1,390.00

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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.


Virtual instrument application of Sonel MRU-30
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Measurements:


  • earth ground resistance using auxiliary electrodes,

  • earth ground resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),

  • earth ground 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 at frequency 50Hz, 60Hz,

  • selection of maximum measuring voltage (25V and 50V)

  • selection of the distance between test electrodes in meters (m) and feet (ft)

  • memory storage 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 to 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 to 9.99 Ω 0.01 Ω ±(2% m.v. + 3 digits)
10.0 to 99.9 Ω 0.1 Ω
100 to 1999 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 to 9999 Ω (for 50 V)




























Range Resolution Accuracy
0.00 to 19.99 Ω 0.01 Ω ±(3% m.v. + 3 digits)
20.0 to 199.9 Ω 0.1 Ω
200.0 to 1999 Ω 1 Ω ±5% m.v.
2000 to 9999 Ω 1 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)




























Range Resolution Accuracy
0.00 to 19.99 Ω 0.01 Ω ±(3% m.v. + 3 digits)
20.0 to 199.9 Ω 0.1 Ω
200 to 1999 Ω 1 Ω ±5% m.v.
2000 to 9999 Ω 1 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





















Range Resolution Accuracy
0 to 999 Ω 1 Ω
±(5% m.v.+ 8 digits)
1.00k to 9.99 kΩ 0.01 kΩ
10.0k to 19.9 kΩ 0.1 kΩ

 

Measurement of multiple earthing resistance with using double clamps



















Range Resolution Accuracy
0.00 to 19.99 Ω 0.01 Ω ±(10% m.v. + 8 digits)
20.0 to 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 to 9.99 Ωm 0.01 Ωm depending on measurement
accuracy RE with 4p method,
but not less than ±1 digit
10.0 to 99.9 Ωm 0.1 Ωm
100 to 999 Ωm 1 Ωm
1.00 to 9.99 kΩm 0.01 kΩm
10.0 to 99.9 kΩm 0.1 kΩm
100 to 999 kΩm 1 kΩm

L – distance between probes: 1 to 50 m or 1 to 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: 14F to 131F / -10 to +55°C,

  • storage temperature: -4F to 176F / -20 to +80°C,

  • humidity: 20 to 90%,


Other technical data:

  • LCD display: segment, backlit,

  • dimensions: 7.87" x 5.90" x 2.91" / 200x150x74 mm.