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.
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
Earth Resistance Ranges
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
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 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.
Operating : 0̊C to +55̊C <90% RH
Storage : -20̊C to +70̊C <90% RH
Operating : 95% RH non condensing max at 40 ̊C
Storage : 93% RH non condensing max at 55 ̊C
Flash Test : 2KV AC
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
4nos. spike of 10mm dis, 450mm long
10m, 20, 30m &40m of measurement cable on a winder as standard
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.
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.
By using the MOT-WARE software, all equipment testing difficulties have been removed, leading to increased efficiency and happy clients.
Motwane offers great products! The company fullfills our demands, and supplies reliable products for our Power, Oil & Gas, and other industry projects.
MOTWANE is reputed brand since many years & we prefer it for all our International Projects
We are very satisfied on Motwane’s oil testing products to test electrical properties of Insulation Oil
TATA Projects regularly uses Motwane’s Test & Measurement equipment for various undertakings. We are satisfied with the product performance!
MOT-WARE will enable us to go live with data immediately after recording
It’s easy to switch to Motwane. Our specialists take care of all conceivable requirements your project may have. With over a 100 years of experience in delivering world-class projects, Motware is the right choice.Enquire Now
Book a demo⨯