Turf-Tec Clegg Impact Soil Tester 0-150 g unit with Clegg Control App Setup and Instruction Manual V-03 1471 Capital Circle NW, Ste # 13 Tallahassee, FL. 32303 USA Order Line (800) 258-7477 - Phone (850) 580-4026 - Fax (850) 580-4027 Website: www.turf-tec.
Table of Contents Hardware System Description Device Parts Specifications Precautions Control: Power Control: Hammer Connection Control: Operational Check Hammer Drop Procedure Performing a Clegg Impact Test Impact Control Custom Protocols Testing Procedure Standard Drop Height Dropping the Hammer ASTM and Australian Standards Hardware Warranty 3 3 3 4-5 5 5 6 6-7 7 7 7 8 8-9 9 9-10 10 Clegg Control App Clegg Impact Soil Tester with Clegg What is New? App Wizard Connect a Device App Settings Contact Suppo
Hardware System Description Dr. Baden Clegg developed the Clegg Impact Soil Tester while working for the Department of Civil Engineering at the University of Western Australia in the 1970’s. The Clegg Hammer is an easy-to-use device consisting of two basic components: a flat ended cylindrical mass (the hammer) and a guide tube. When the hammer strikes the soil surface, a precision accelerometer mounted on the hammer feeds its output to a Control Unit, which sends a digital readout to a handheld tablet.
Precautions The Clegg Impact Soil Tester has been designed to be easy-to-use and provide years of service. Though primarily used outdoors in many types of situations, it is a scientific instrument incorporating specialized electronic components meaning that due care is necessary to ensure trouble-free performance and avoid costly repairs. To prolong the use of the device, observe the following precautions.
obtained from using the standard drop-height so any correlation with other outputs or test properties will need to be redetermined or recalculated. The accelerometer generates a signal regardless of any other electronics or power supply; it is always “on” detecting vibrations. Protect the hammer from extreme shock even when the Control Unit is not switched on or connected. Do not drop the hammer directly on concrete.
Important – Perform Operational Check on test pad before first use of Clegg Control: Operational Check and to Verify Calibration A 12x12 inch foam calibration pad is provided for the user to verify that the instrument is working properly. The operational check is carried out in a similar fashion as the standard test but always with the calibration pad in place on a smooth concrete surface. The pad is not used for normal testing but only when making an operational check.
PLUNGER RELEASE When using the Clegg, the Plunger Release can be used to provide consistent drop distance. Place palm of hand against the handle and grasp the spring plunger knob between the index and middle finger. Pull the knob to retract the pin from inside the tube and raise the hammer so the white line mark is above the top of the tube guide. Release the knob and rest the bottom of the hammer on the plunger pin inside the tube.
In the case of Impact Control, there are no hard and fast rules because the results are dependent on soil type, organic matter, moisture content, and the influence of the turf grass and its root zone. It is recommended to run a few experiments to determine the protocol that works best for your application or use your experience which may well be the best predictor of what range of impact values provide the desired results.
Alternately: Rest the bottom of the hammer on the pin projecting inside the tube. Pull the knob on the Hammer Release Spring Plunger* to release the hammer to drop. * Read Hammer Drop Procedures on page 6 for more details on using the Hammer Release Spring Plunger. What to do if the hammer is dropped below the desired height? • If the control is set to determine the Peak impact value, this should not affect the Peak Value reading because the undesirable drop will result in a low reading.
ASTM and Australian Standards ASTM D5874 Standard test method for determination of the impact value (IV) of a soil. ASTM F355 Standard test method for shock absorbing properties of playing surface systems and materials ASTM F1702 Standard test method for measuring shock-attenuation characteristics of natural surface systems using lightweight portable apparatus (refers to 2.
Clegg Control App Clegg Impact Soil Tester with Clegg Control App For convenience of portability and simplicity of updating, the most up-to-date Clegg Impact Soil Tester and Clegg Control app manual is readily available via the Clegg Control app. This version is sports field specify and is available from Turf-Tec International www.turf-tec.com with the purchase of a Clegg Impact Tester from Turf-Tec International or one of our distributors.
CONNECT A DEVICE In order to connect the Clegg Control app to a Clegg device, be sure that the tablet with the Clegg Control app has Bluetooth enabled; the Clegg Control unit uses Bluetooth to communicate with the tablet. If a situation arises where the app is started without Bluetooth enabled, the app will display a warning allowing the user to enable Bluetooth. 1. Enable Bluetooth via tablet settings. 2. Tap the hamburger-style button (3 vertical dots) on the upper right of the screen. 3.
Standard Drop mode allows users to create specific locations to define and store testing scores. Standard Drop mode is recommended for every usage of the Clegg device. For more information about creating a Standard Drop test, read the Test Setup section on page 13. Quick Drop mode allows a user to quickly make a series of drops. Quick Drop mode removes much of the advanced features available when using Standard Drop mode. Quick test results can be saved with an additional test description and drop comments.
CREATE A SESSION Before beginning a test, session be sure to have the necessary app settings selected via the App settings screen. Specific settings are detailed in the App settings area of this manual; the specific settings for standard procedures are available in the Testing procedure section. 1. Tap the NEW button under a Drop site to bring up the Run session screen. 2. Verify the onscreen details.
Scores One of the biggest improvements of the Clegg Control app is that previous scores are stored in the app database by Drop site and Drop location. SAVING SESSION SCORES The Clegg Control app saves the session after each drop is recorded. The current session can be exited by tapping the FINISH button in the upper right of the Run session screen. A finished session cannot have additional drops added. VIEWING PREVIOUS SCORES 1.
Suggested Clegg Drop Points for Gmax readings on Football Fields • • • • The Clegg 2.25 kg reading should be the first drop of the hammer Total of 10 test areas. Drop points 1 through 8 are required areas. Drop points 9 and 10 are areas of your choosing in areas where you suspect high Gmax levels might be expected (areas where equipment enter the field or bench areas for example.
Formula converting Gmax from Clegg to F355 units ***Note*** The reading should be the first drop of the hammer, not the highest reading after 4 drops as described in the ASTM F355 instructions. Also if App Settings are in “Gmax” and “Peak”as described on page # 12 of this instruction manual, you do not need to use the below regression equation. Only use this equasion if your App Settings are in “G” and “Peak”. Clegg Impact Soil Tester using the regression equation (F355 × 0.81) - 27.
