Digital Earth Tester

DET 20 is a conventional 3 ½ digits LCD  designed to measure earth resistance, soil resistivity & earth voltage. It has a unique RSR technology in which the measurement reading remains constant even when the battery voltage drops. DET 20 has a 128Hz test frequency that eliminates the harmonics interference and has a rechargeable long-life battery which reduces costs.

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    DET 20 is a conventional 3 ½ digits LCD  designed to measure earth resistance, soil resistivity & earth voltage. It has a unique RSR technology in which the measurement reading remains constant even when the battery voltage drops. DET 20 has a 128Hz test frequency that eliminates the harmonics interference and has a rechargeable long-life battery which reduces costs. Earth resistance is measured by three wires & soil resistivity is measured by four-wire measurement techniques. This meter is shockproof and dustproof and comes with an ABS casing for heavy duty application. DET 20 is type tested as per IS 9223.

    Application

    The integrity of the grounding system is very important in an electrical power system for the following reasons: 
    To maintain a reference point of potential (ground) for equipment and personnel safety 
    To provide a discharge point for traveling waves due to lightning 
    To prevent excessive high voltage due to induced voltages on the power system
    Therefore to maintain sufficient low resistance values of grounding systems, periodic testing is required. The testing involves measurement to ensure that they do not exceed design limits. 

    The measurement of ground resistances can be accomplished with specially designed test equipment. The most common method for measuring ground resistance is the fall-of-potential principle of alternating current (AC) at a higher frequency circulating between an auxiliary electrode and the ground electrode under test. The reading will be given in ohms and represents the resistance of the ground electrode to the surrounding earth.

    Soil resistivity is also a key factor that determines what the resistance of a grounding electrode will be, and how deep it must be driven to obtain low ground resistance. The resistivity of the soil varies widely throughout the world and changes seasonally. Soil resistivity is determined largely by its content of electrolytes, consisting of moisture, minerals, and dissolved salts. Dry soil has high resistivity if it contains no soluble salts. The figures have a direct impact on the overall substation resistance and how much earth electrode is required to achieve the desired values. The lower the resistivity the fewer the electrodes required to achieve the desired earth resistance value. Hence soil resistivity is also an important test.

    The methods of measuring and testing the ground resistance and soil resistivity are as follows:
    3 pole method used for earth resistance testing
    4 pole method used for soil resistivity testing.

    Typically used for 

    • Substation earth testing
    • To test telecom tower grounding and railways earthing
    • To test the quality of grounding without disconnecting the ground rod under test 
    • Earth resistance of the grid

    Features

    • 3 ½ digits LCD display with a maximum reading of up to 1999
    • 3 terminal and 4 terminal measurement method
    • Earth resistance range from 0.01Ω to 1999Ω
    • 4 soil resistivity measurement
    • Rechargeable internal Ni-MH battery
    • Earth measurement voltage of up to 200V
    • Ratiometric synchronous rectification

     

    Earth Resistance Ranges

    0.01Ωto 19.99Ω

    0.1Ωto 199.9Ω

    1Ωto 1999Ω

    Accuracy (25̊ C ±5̊C)

    ±1.5% of reading ±5 digits valid from 10% to 95% of the range.

    Earth voltage accuracy: 2% of the range

    Earth voltage resolution: 1V

    Test Frequency: 128Hz ±0.5Hz

    Test Current

    20 Ω Range: 10mA AC RMS

    200 Ω Range: 1mA AC RMS

    2000 Ω Range: 100µA AC RMS

    Test current is generally constant throughout the range

    Power Supply: Internal, rechargeable Ni-MH 1.2V, 600mAh x 8nos.

    Charging time: Recommended 16hrs.

    Single Charge Battery life: Approximately 5-6hrs of continuous operation on mid-range.

    Interference

    Interference voltage of 20V ±5% peak to peak, 50Hz in the potential circuit will

    have a maximum effect ±1% on the reading obtained from the 20 Ω to 2KΩ range.

    Influence of Temperature:

    <±0.2% per ̊C over the temperature range 0-20̊C and 28-55̊C.

    Temperature Range

    Operating : 0̊C to +55̊C <90% RH

    Storage : -20̊C to +70̊C <90% RH

    Humidity

    Operating : 95% RH non condensing max at 40 ̊C

    Storage : 93% RH non condensing max at 55 ̊C

    Flash Test : 2KV AC 

    Voltage withstand

    In the event of a system fault, the instrument will withstand 240V AC, applied between any two terminals.

    Dimensions : 180(H) x 100 (W) x54 (D) mm

    Wight : 550gms without accessories

    Standard Accessories

    4nos. spike of 10mm dis, 450mm long

    10m, 20, 30m &40m of measurement cable on a winder as standard

    Battery charger

    Hammer

    Carry bag

    Instruction manual

    Our Customers

    Motwane’s customer base is a testament to its ongoing ability to provide reliable, accurate, and long-lasting products, resulting in enduring relationships that are based on mutual satisfaction, loyalty, and trust.

    Contact Us

    Motwane products are highly reliable, built with great quality, and deliver accurate results.  We at BSES Rajdhani Power have been using Motwane products for many years, and continue to do so.

    Shailendra Saxena

    Additional VP Protection BSES Rajdhani Power Ltd.

    Motwane is the oldest and the most trusted company in electrical testing products and solutions also. Motwane is known for reliable and rugged products also, we have procured from them. And our organization has been using these products and have found them satisfactory in performance and services also.

    Mr. Shrikant S Rajurkar

    Director Technical MSETCL

    By using the MOT-WARE software, all equipment testing difficulties have been removed, leading to increased efficiency and happy clients.

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    Managing Director JBS Enterprises Pvt. Ltd.

    Motwane offers great products! The company fullfills our demands, and supplies reliable products for our Power, Oil & Gas, and other industry projects.  

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    FAWAZ Trading & Engineering Services Co. W.L.L.

    MOTWANE is reputed brand since many years & we prefer it for all our International Projects

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    DGM- India Operations MBH Power Pvt. Ltd.

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    LABGULF Sharjah UAE

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    AGM Projects Tata Projects Ltd.

    MOT-WARE will enable us to go live with data immediately after recording

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    Head Projects IBMS SPG, Sterling and Wilson

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