Earth Resistance Meter | MRU-200 GPS

Earth Resistance Meter | MRU-200 GPS

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Safety Rating Cat IV at 300V label Safety Rating Cat III at 600V label Bluetooth Enabled label GPS

Overview of  MRU-200 Earth Resistance meter

The MRU-200 earth resistance meter is a unique meter in the market, which uses all measurement methods to get earth resistance.  Making sure the ground system has a low earth ground resistance when initially installed is a very important safety check, but making sure the  low resistance is maintain is just as important. Resistance of grounding system might increase when the ground rods are corroded. Over time soil with high moisture, salt content and high temperatures will corrode connections.  It is therefor recommended that the earthing be checked periodically to make sure there is not an big increase in resistance.

Earth Resistance Meter Features:

  • earth resistance measurement with 2-pole, 3-pole,4-pole method,
  • two clamps earth resistance measurement without auxiliary test probes,
  • impulse earth impedance measurement, three kinds of measuring impulse 4/10μs, 8/20μs, 10/350μs,
  • earth resistance measurement without disconnecting measured earths (using clamp),
  • earth resistivity measurement,
  • continuity measurement,
  • leakage current measurement.
  • optional built in GPS,
  • GPS coordinates of the measurement are stored in meter memory (with GPS model)
  • measurement of resistance of auxiliary electrodes RS and RH,
  • measurement of interference voltage,
  • measurement of interference frequency,
  • measurement in the presence of interference voltage in the power network
  • with frequency 16 2/3 Hz, 50 Hz, 60 Hz and 400 Hz (with automatic selection of proper frequency of measuring signal or with
  • anual selection),
  • selection of maximum measuring voltage (25 V and 50 V)
  • 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,
  • real time clock (RTC),
  • data transmission to the computer USB and Bluetooth*,
  • indication of battery state.

Description

It allows to take the measurements of:

  • earth resistance using auxiliary electrodes,
  • earth resistance using auxiliary electrodes and clamp (for measurements of multiple earthing)
  • earth resistance using double clamps for measuring multiple earthing without underground connections,
  • impulse earth impedance (without disconnecting measured earthing),
  • ground resistivity (Wenner method),
  • current using the clamp (e.g. leakage) and flexible clamp (Rogowsky coil),
  • measurement of continuity of equipotential bondings and protective conductors (meeting the requirements of IEC 60364 – 6 – 61:2000 section 6.12.2) with auto-zero function – with current 200 mA.

Additionally:

  • measurement of resistance of auxiliary electrodes RS and RH,
  • measurement of interference voltage,
  • measurement of interference frequency,
  • measurement in the presence of interference voltage in the power network
    with frequency 16 2/3 Hz, 50 Hz, 60 Hz and 400 Hz (with automatic selection of proper frequency of measuring signal or with manual selection),
  • selection of maximum measuring voltage (25 V and 50 V)
  • 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,
  • real time clock (RTC),
  • data transmission to the computer USB and Bluetooth*,
  • indication of battery state.

*Bluetooth communication from serial number E40001

Electric security:

  • type of insulation: double, according to EN 61010 – 1 and IEC 61557
  • measurement category: CAT IV 300 V acc. to EN 61010 – 1
  • protection class acc. to EN 60529: IP54

Rated operational conditions:

  • operation temperature: -10…+50°C
  • storage temperature: -20…+70°C
  • humidity: 20…80%

Other technical data:

  • LCD display: graphic, backlighted
  • interface: USB
  • number of measurements carried out of set of batteries: > 1200
  • warranty: 24 months

Measurement of interference voltage

Range Resolution Accuracy
0…100 V 1 V ±(2% m.v. + 3 digits)

Measurement of interference frequency

Range Resolution Accuracy
15…450 Hz 1 Hz ±(1% m.v. + 2 digits)

Measurement of earthing resistance (method 3- and 4-pole) 
measurement range to IEC61557 – 5: 0,100 Ω…19,9 kΩ

Range Resolution Accuracy
0,000…3,999 Ω 0,001 Ω ±(2% m.v. + 4 digits)
4,00…39,99 Ω 0,01 Ω ±(2% m.v. + 2 digits)
40,0…399,9 Ω 0,1 Ω
400…3999 Ω 0,001 kΩ
4,00k…19,99 kΩ 0,01 kΩ ±(5% m.v. + 2 digits)

Measurement of continuity of equipotential bondings and protective conductors (Rcont
measurement range to IEC61557 – 4: 0,045 Ω…19,99 kΩ

Range Resolution Accuracy
0,000…3,999 Ω 0,001 Ω ±(2% m.v. + 4 digits)
4,00…39,99 Ω 0,01 Ω ±(2% m.v. + 2 digits)
40,0…399,9 Ω

0,1 Ω

400…3999 Ω 0,001 kΩ
4,00k…19,99 kΩ 0,01 kΩ ±(5% m.v. + 2 digits)

Measurement of resistance of auxiliary electrodes RH and RS

Range Range Accuracy
0…999 Ω 1 Ω ±(5% (RS+RE+RH) + 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 the clamp and auxiliary
electrodes (3p + clamp)

Range Resolution Accuracy
0,000…3,999 Ω* 0,01 Ω ±(8% m.v. + 4 digits)
10,0…99,9 Ω 0,01 Ω ±(8% m.v. + 3 digits)
100…999 Ω 0,1 Ω
1,00k…1,99 kΩ 1 Ω

* – in range 0,000…0,045 Ω the accuracy is not specified.

Measurement of multiple earthing resistance with using double clamps

Range Resolution Accuracy
0,00…19,99 Ω 0,1 Ω ±(10% m.v. + 3 digits)
20,0…149,9 Ω 0,1 Ω ±(20% m.v. + 3 digits)

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

Range Resolution Accuracy
0,0…199,9 Ωm 0,1 Ωm depending on measurement
accuracy RE with 4p method,
but not less than ±1 digit
200…1999 Ωm 1 Ωm
2,00k…19,99 kΩm 0,01 kΩm
20,0k…99,9 kΩm 0,1 kΩm
100k…999 kΩm 1 kΩm

L – distance between probes: 1…50 m
Measurement of AC current (leakage)

Range Resolution Accuracy
0,1…99,9 mA 1 0,1 mA ±(8% m.v. + 5 digits)
100…999 mA 1 1 mA ±(8% m.v. + 3 digits)
1,00…4,99 A 1,2 0,01 A ±(5% m.v. + 5 digits)1
unspecified 2
5,00…9,99 A 1,2 0,01 A ±(5% m.v. + 5 digits)
10,0…99,9 A 1,2 0,1 A
100…300 A 1,2 1 A

– receiving clamp (diameter 52 mm) – C-3
2 – flexible clamp (Rogowsky coil) with diameter 400 mm – F-1

Measurement of dynamic earthing resistance (RD) with impulse wave method (4p )

Range Resolution Accuracy
0,0…99,9 Ω 0,1 Ω ±(2,5% m.v. + 3 digits)
100…199 Ω 1 Ω

choice impulse edges: 4/10μs, 8/20μs, 10/350μs

„m.v.”- measured value

Standard Accessories

  • Test lead with banana plug; 1,2 m; red
  • Test lead with banana plugs 2,2 m; black
  • Test lead on a reel with banana plugs; 25 m red
  • Test lead on a reel with banana plugs; 25 m blue
  • Shielded test lead on a reel with banana plugs; 50m yellow
  • USB transmission cable
  • charger for battery loading from the socket of car lighter (12 V)
  • Earth contact test probe (rod); 0,30 m – (4 pcs.)
  • Carrying case L2
  • Ni-MH battery package 4,8 V 4,2 Ah
  • Crocodile clip K01; black
  • Crocodile clip K02; red
  • Cramp
  • Power supply adaptor Z7
  • Cable for battery charger
  • Hanging straps
  • Calibration certificate issued by calibration laboratory

Brand

Sonel

Sonel Details.
Sonel Logo png

Additional information

Options

MPU-200 standard, MPU-200 with Bluetooth and GPS

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