MRU-30 Earth Ground Resistance and Resistivity Meter
MRU-30 Earth Ground Resistance and Resistivity Meter
Price: $1390
Description
Technical specification
Files
  • Description

    The Sonel MRU-30 is a rugged, portable tool for earth ground resistance measurements. Tests can be performed using the 2-pole, 3-pole, 4-pole, or 3-pole with current clamp methods. Additionally, the MRU-30 can perform the current clamp method using two clamps (one to generate, and one to measure current) for situations when test electrodes can't be used.

    The MRU-30 provides measurements of soil resistivity, continuity measurement of protective and equipotential conductors, interference voltages, and - with current clamp - leakage current.

    Features:

    • Robust and weatherproof (IP65) - protection against ingress of dust and water
    • Ergonomic casing - small, light-weight, convenient for carrying and field work
    • Built-in rechargeable battery - can be recharged from an outlet or 12V Car socket
    • Clear on-screen display to view results
    • Safety - alerts user of possible dangers and irregularities before and after the measurement
    • User can use choose between measurement methods
    • Test leads. test electrodes, and power adapter are included

    New earth resistance and ground resistivity meter - Sonel MRU-30

    Test drive the MRU 30 with this Online Simulator:

     

    There is also an offline simulator of MRU 30 ready to download in the Files section.

  • Technical specification

    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.
  • Files

We also recommend