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Laboratory Equipment

                                                                                                        

 

4.5 Kg Hammer Model Type 882 (Classic)

4.5 Kg Clegg Impact Hammer 882 (Classic) fitted with precision accelerometer.

  • Digital readout indicator type 882 fitted with single 9V battery in slide out drawer.
  • Connecting cable, 50 Ohm impedance type CIST/BNC/09.
  • Guide tube fitted with locking pin and chain.Check Ring (checks functionality).
  • Operating Manual providing operating practices, checks and fault finding.
  • Factory Calibration Certificate.
  • Wooden Transit Case

 

 The Tester consists of a 4.5 kg compaction hammer operating within a vertical guide tube. When the hammer is released from a fixed height, it falls through the tube and strikes the surface under test, decelerating at a rate determined by the stiffness of the material within the region of impact. A precision accelerometer mounted on the hammer generates an electrical charge which is fed by a cable to a hand-held digital readout unit. The fast microcontroller in the readout scans and filters the signal and registers the deceleration in units of Impact Value (IV). The Impact Value is an indication of soil strength and shows good correlation with results from CBR tests. Data from the Impact Soil Tester can therefore be used in a similar manner to results from CBR tests performed in the laboratory and in the field. The Tester is powered by a single 9V PP3 battery accessible in a pull-out drawer on the side of the readout unit.

 

 

4.5 Kg Hammer Model Type 883 (Data Logging & Bluetooth)

The 4.5 Kg 883 Clegg Impact Soil Tester  provides an easy and straightforward means for measuring and controlling soil strength and consolidation levels during trench re-instatement. The 883 readout is clamped to the guide tube and the displayed reading is viewed from the top during use. Single button operation design provided for easy use.

  • 4.5 Kg Standard Hammer
  • Impact Value (IV) readings stored in memory
  • Stored data downloaded by Bluetooth
  • %CBR Calculated and can be set to displayed by the user
  • Software and ancillaries included
  • Carry case provided
  • Easy to use

Data Logging Feature

On board data logging and data storage with wireless data transfer facilities are features provided with the 883 instrument. Users can download their test results from site to PC, wirelessly, using the PC software supplied with the instrument. This cable-free operation greatly enhances system reliability compared to cabled systems.

Usage

The instrument is used to confirm uniform compaction of over wide areas of ground, identifying poorly compacted areas and ineffective rolling of materials.

Tough Design

The 883 Clegg Impact Soil Tester is a very rugged design suitable for prolonged use in damp, dirty and harsh site environments. The 883 readout unit is made from high strength alloy that has been proven to last for decades. The 883 battery compartment, sealed to IP67, is fitted with 2 x AA batteries for typically 12 months operation. The 883 Clegg Impact Soil Tester is a compact and reliable instrument. A wooden Transit & Storage Case is included.

Operating Principle

The Tester consists of a 4.5 kg compaction hammer operating within a vertical guide tube. The Hammer falls through the tube when released and strikes the surface under test, decelerating at a rate determined by the stiffness of the material within the region of impact. The readout registers the deceleration in units of Impact Value (IV). The IV is an indication of soil strength.

CBR Measurement

Good correlation with results from CBR tests exists. Data from the 883 can be used in a similar manner to results from CBR tests performed in the laboratory and in the field. The 883 display can directly show the %CBR result based upon Dr Clegg’s original pioneering work. This feature is simply selected from the PC software provided.

 

883 Readout Unit

The Readout Unit displays readings of Impact Value (IV) and also shows the number of times that the hammer has been dropped during each test operation. Example:- readings of 25 IV and drop number 4 are shown on the readout unit in the picture on the right.

Carrying out a test is quick and straightforward. The ground surface is brushed lightly with the foot to remove loose material and the guide tube is placed in position. The digital readout is located on the guide tube, shown above, during testing allowing easy use as there is no need to hold the readout in the hand. The hammer is raised to a height of 450 mm as indicated on the hammer head and then allowed to fall freely. This procedure is repeated four times, the reading achieved on the fourth drop being recorded as the Impact Value. Software selectable Quality Assurance (Q. A.) Readout firmware can advise the user of a failed re-instatement.

 

Tables of target IV for a range of backfill and subgrade materials are given in the operating manual, enabling the operator to check the compliance of reinstatements with the specification levels.

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