Clegg Impact Tester / Clegg Decelerometer
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The Clegg Impact Tester is a professional instrument to determine hardness on all types of areas - Readings in CIT's or Gravities (Gmax).
The principle behind the Clegg Impact Soil Tester, also called the Clegg Hammer and Clegg Decelerometer is used to obtain a measurement of the deceleration of a free falling mass (Hammer) from a set height onto a surface under test to determine hardness. The impact of the hammer produces an electrical pulse, which is converted and displayed on the Control Unit in units of gravities "G-max" or tens of gravities "CIT". Reference ASTM test methods D5874 and F1702.
The standard test protocol developed by Dr. Clegg is to drop the hammer four consecutive times on the same location with the highest value result in the series taken as the Peak Clegg Impact Test result. Since that time, other test protocols have been used based on the materials under test and the application. These other protocols like the ones used for testing artificial turf test the area with a single drop. The Clegg offers the convenience of rapidly scanning compaction variation over large areas. In research studies, 250 tests were performed with the Clegg in a half-day.
The NEW PNCLEGG-S-2.25-A- Clegg Impact Tester 2.25 kg model reads out from 0 to 150 Gravities or 0 to 15 CIT's and has a better accuracy range (+/- 1% or 1.5 G Accuracy) as compared to the 0-1000 Gravity unit (+/- 1% or 10 G Accuracy) for testing soft surfaces like natural and artificial athletic fields, infill products and sports fields. This model is the same model that is used to test all NFL National Football League Stadium Fields before games. Instruction manual comes with conversion formula to convert readings to F355 readings. Note the 150 g maximum reading on this unit is equal to approximately 219 gravities in ASTM F355 range after using the conversion formula.
Simple and quick test procedure
Clegg shown with Turf-Tec optional hard case
|The Clegg Impact Tester is a professional instrument to determine hardness on all types of areas from Baseball, Football, Soccer, Natural Grass, Artificial Turf, Infill, Horse Racing, Turf Racing and all types of sports where ever surface harness is important from turf care needs to playability.|
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The Clegg may be transported and operated by one person, allowing for low cost, rapid field and laboratory testing and direct readout of the test results. The Clegg can test a full range of soil and stone as encountered in the construction of flexible pavement and earthworks. It is useful for quickly checking variations during construction and monitoring changes over time due to seasonal environmental changes or road traffic as well as testing natural and "as constructed" conditions. The Clegg can test a full range of natural and artificial athletic surfaces, pads, infill materials, amendments where hardness or impact characteristics need to be controlled for safety or playability.
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Suggested Reading from Penn State University's Center for Sports Turf Research
"Surface Hardness (Gmax)"
By: Andrew S. McNitt, Thomas Serensits and Dianne M. Petrukak
PNCLEGG-S-0.5 - Clegg Impact Tester 0.5 kg model
PNCLEGG-S-2.25 - Clegg Impact Tester 2.25 kg model (0 to 1000 Gravities) (+/- 1% or 10 G Accuracy)
New PNCLEGG-S-2.25-A- Clegg Impact Tester 2.25 kg model (0 to 150 Gravities) For testing Athletic Fields (+/- 1% or 1.5 G Accuracy)
Case-Clegg-Tshear - Optional Hard Case for Clegg
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1471 Capital Circle NW, Suite # 13
Tallahassee, FL. 32303
Order Line (800) 258-7477
Phone (850) 580-4026
Fax (850) 580-4027
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