Table of Contents
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NEW PRODUCT LAUNCH
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The latest additions to the DET Earth testing range.
Providing a solution to every
earth testing challenge
Megger Limited
DET4TC/R launch
Sales guide
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PWS / Nov 06
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Summary of Contents for Megger DET3 Series
- Page 1 NEW PRODUCT LAUNCH Sales guide The latest additions to the DET Earth testing range. Providing a solution to every earth testing challenge Megger Limited PWS / Nov 06 DET4TC/R launch...
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Page 2: Table Of Contents
Application Guide .................15 The “ART” of earth electrode testing ..........15 Just a little aside ..................16 Megger gets down to earth with “ART” ..........16 Don’t underestimate the power of “ART” ...........18 The problem with Spheres of Influence ..........19 We all like “ART” but sometimes it’s misunderstood ....21... -
Page 3: Product Family
✔ ✔ Earth Current Range 0.5mA to 19.9A ✔ ✔ ✔ ✔ ✔ Supply Alkaline batteries Rechargeable batteries ✔ Where does the name come from? Digital Earth Tester 4 Terminal Clamp Rechargeable Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 4: New - Professional Earth Testing Kit
Supplied on four reels with test lead wind in while mounted on test spike feature. o Reels have innovative test lead brushing feature to clean while winding in. • Tape measure Kit part number: 6320-245 Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 5: This Product Is Used For
• ART uses a clamp to measure only the current flowing down the electrode being tested; the instrument then uses this measurement to calculate the resistance of electrode. Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 6: This Product Is Used By
ART and Stakeless testing. This will give valuable assistance to customers, allowing them to fully understand and get the most from these test methods. Further, more detailed information on earth testing may be found on the Megger Earth/ground micro site. http://www.megger.com/us/story/Index.php?ID=125 THIS PRODUCT IS USED BY? •... -
Page 7: Technical Overview
TECHNICAL OVERVIEW Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 8: Principle Of Operation
In this case, the instrument will make a reading of the entire earthing network, not just the individual electrode. By using a current transducer (the Megger ICLAMP) to measure the current flowing through the electrode under test as a fraction of the total test current injected, the instrument can determine the individual resistance. - Page 9 I=V/[Rx+(R1 || R2 || … || Rn)]. It follows that as the resistance of the other electrodes in parallel approaches zero, then the resistance measured, approaches the value of the electrode under test. Megger Limited PWS / Nov 06 DET4TC/R Launch...
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Page 10: Features, Advantages And Benefits
Able to make accurate measurements with up to 40V peak to peak (ground voltage) between the potential terminals. Can be used in most locations with ground noise such as sub-stations, near transformers etc. Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 11: Ordering Information
List prices are provided on a separate price list sheet. COMPETITOR ANALYSIS Separate full competitor analysis tick charts are available separately However here are some individual competitor comparisons for the competitors equipped with both selective (ART) and stakeless capability: - Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 12: Det4Tc/R Verses Fluke 1623
11. Easy to use with quick start guide on lid, colour coded terminals and clear display. 12. Selective ART accuracy a. Megger ±5%, ±3 dig b. Fluke ±7%, ±3 dig 13. Superior operating and storage temperature range. 14. DET4TCR has capability to charge from 12V vehicle socket with optional lead. -
Page 13: Det4Tc/R Verses Fluke 1625
Following LEMs takeover by Fluke, the Saturn Geo X was re-badged as the Fluke 1625. Other than the colour the units have not changed. The 1625 are equipped with both selective (ART) and stakeless testing. Megger DET4TC advantages: 1. Competitive price 2. IP54 rated case a. -
Page 14: Det4Tc/R Verses Metrel M2124C
The M2124C like the DET4TC/R is a 2,3 or 4 pole tester complete with both selective (ART) and stakeless 2 clamp measurements. Megger DET4TC advantages: 1. Quality of case with better case design. a. Lid of M2124C has habit of trapping operator’s fingers when you open 2. -
Page 15: Application Guide
This can also involve downtime, or reduce the degree of protection to the installation. Now Megger has a solution to this problem in the form of A.R.T., the Attached Rod Technique. When the earth tester injects a test current into an electrode which is still connected to the system, current not only flows down the electrode under test, but back into the building’s system, and down any other electrodes connected in parallel. -
Page 16: Just A Little Aside
Just a little aside The ICLAMP has the ability to measure very small currents, so Megger used this ability to add yet another benefit. The DET4TC is equipped with an earth leakage range, allowing quick and easy measurement of leakage current flowing into the earth system. - Page 17 20 times that of the total system and still be measured. Values higher than 20 times cannot be measured using ‘ART’, and so you will need to carry out a traditional 3-pole measurement. See over leaf. Megger Limited PWS / Nov 06 DET4TC/R Launch...
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Page 18: Don't Underestimate The Power Of "Art
Then using ICLAMP the low current symbol, shown above, appeared on the display. In this instance we cannot use ART. You should still perform a standard 3-pole measurement on the complete system. Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 19: The Problem With Spheres Of Influence
ART should, subject to the 20:1 rule, work fine. Note: If you are unclear as to the meaning of “Sphere of Influence”, more information can be found in the Megger publication “Getting down to Earth”, part number 21500- 072. - Page 20 ART. The result will cause either be the “clamp low” symbol appearing or an unexpectedly high reading. If this happens proceed with the traditional 3-pole method with the electrode under test disconnected. Megger Limited PWS / Nov 06 DET4TC/R Launch...
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Page 21: We All Like "Art" But Sometimes It's Misunderstood
Always consider where the test current is going to flow, all measured test current should flow through the required earth (soil) mass around the electrode under test. Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 22: Some Resistance To Art
There are many applications where ART work extremely well. These include: Field of earth / Earth Farms Pole mounted transformers Domestic TT (earth electrode) systems Single guy lines on towers Lightning protection electrodes Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 23: Stakeless" Earth Electrode Testing
Earth electrode testing can be a difficult and time-consuming business; this is why Megger is committed to making life as easy as possible for you. Our experience of real life situations led to the introduction of ART, first seen with the DET3TC, and now with the DET4TC we add the capability to perform Stakeless measurements. - Page 24 So any poor connections will be highlighted too. The readings taken are ideal for monitoring over time the condition of installations, but without the inconvenience associated with electrode disconnection and the driving in of test stakes. Megger Limited PWS / Nov 06 DET4TC/R Launch...
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Page 25: Incorrect Use Of Stakeless Testing
ART method, test current must go through the earth mass to be able to measure the earth resistance. Used incorrectly the method may give misleading results. Test current flowing around loop Of lighting protection tape. Lightning protection tape Megger Limited PWS / Nov 06 DET4TC/R Launch... -
Page 26: The Best Application Of "Stakeless" Testing
Single guy lines on towers • Lightning protection electrodes With a good understanding ‘ART’ and ‘Stakeless’ testing will be invaluable tools, saving both time and trouble. Further information regarding Megger’s range of earth testers and their applications may be found at www.megger.com Megger Limited...
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