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Instruction Manual
Model 1300
(Model A9)
Retrievable Extensometer
No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no
responsibility for errors, omissions or misinterpretation. The information herein is subject to change without
notification.
Copyright © 1995-2016 by Geokon, Inc.
(Doc. REV H. 11/10/16)
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Table of Contents
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Summary of Contents for Geokon 1300
- Page 1 (Model A9) Retrievable Extensometer No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc. The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for errors, omissions or misinterpretation. The information herein is subject to change without notification.
- Page 3 Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having been tampered with or...
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Page 5: Table Of Contents
TABLE of CONTENTS 1. INTRODUCTION ..............................1 1.1. T ............................1 HEORY OF PERATION 2. INSTALLATION ..............................2 2.1. P ............................2 RELIMINARY ESTS 2.2. E ......................... 2 XTENSOMETER NSTALLATION 2.3. C ..............................4 ABLE PLICING ... - Page 6 LIST of FIGURES and TABLES 1 - M A-9 R ................. 1 IGURE ODEL ETRIEVABLE XTENSOMETER NCHOR 2 - M A-9 I ......................... 3 IGURE ODEL NSTALLATION 1 - E ..................7 ABLE NGINEERING NITS ONVERSION ULTIPLIERS ...
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Page 7: Introduction
1. INTRODUCTION 1.1. Theory of Operation The Geokon Model A-9 Retrievable Extensometer is designed primarily for short term measurements of deformation in boreholes in concrete, rock, etc. The system is used in both precast and cast-in-place concrete piles in plate load tests in rock and anywhere where deformations need to be measured in boreholes, either drilled or cast in to the structure being analyzed. -
Page 8: Installation
2. INSTALLATION 2.1. Preliminary Tests Before assembly and installation of the extensometer the transducers should be checked for proper operation. See Section 3 for readout instructions. In position "B" of the GK-401, GK- 403 and GK-404 Readouts the gage will read between 2000 and 2500. The transducer may need to be slightly extended to get a reading. - Page 9 Manifold Pressure Supply 2. Connect the rod to the Swagelok fitting on the Regulator bottom anchor, pushing it in until it hits the shoulder. Tighten the Swagelok finger tight, then geo kon Transducer Cables an additional 7 flats (1¼ turns). Use two wrenches to do this, one on the Swagelok nut, the Position #5 other on the body.
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Page 10: Cable Splicing
The assembly is now ready for installation in the borehole. Lower into the borehole with the bottom anchor first. Bend the connecting rod through a large arc, as needed to lower the extensometer. Be careful not to permanently bend the rods. 6. -
Page 11: Taking Readings
3. TAKING READINGS 3.1. Operation of the GK-401 Readout Box The GK-401 is a basic readout for all vibrating wire transducers used in the Model A-9 Retrievable Extensometer. Connect the Readout using the flying leads or in the case of a terminal station, with a connector. The red and black clips are for the vibrating wire gage, the green or blue clip for the shield drain wire. -
Page 12: Operation Of The Gk404 Readout Box
3.3. Operation of the GK404 Readout Box The GK404 is a palm sized readout box which diplays the Vibrating wire value and the temperature in degrees centigrade. The GK-404 Vibrating Wire Readout arrives with a patch cord for connecting to the vibrating wire gages. -
Page 13: Data Reduction
4. DATA REDUCTION 4.1 Digits The basic units utilized by Geokon for measurement and reduction of data from the vibrating wire displacement transducers used in the Model A-9 are "digits". The units displayed by the GK-401, GK-402, and GK-403 in position "B" are digits. Calculation of digits is based on the following equation;... - Page 14 To calculate strain divide the deformation by the distance between the anchors. For example, if the deformation change between two anchors spaced 12 feet apart was -0.1016 inches. The strain change for that segment of the pile, uncorrected for temperature, would be -0.1016/144 x 10^6 = -706 strain (compression).
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Page 15: Temperature Correction
4.2. Temperature Correction The Model 4430 Deformation Meter used in the Model A9 Extensometer has a vibrating wire transducer with a small coefficient of thermal expansion and the body of the transducer contracts and expands slightly with changes in temperature. The interconnecting rods also expand and contract so in most cases correction is advisable. - Page 16 The Model 4430 deformation meter length temperature correction (L ) is calculated using Equation 5. = 17.3 10 L (T Equation 5 – Deformation Meter Length Correction Where L is the length of deformation meter in millimeters or inches, (see Table 2), The rod length correction (L ) is calculated from the equation 6 ...
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Page 17: Troubleshooting
5. TROUBLESHOOTING Consult the following list of problems and possible solutions should difficulties arise. Consult the factory for additional troubleshooting help. Symptom: Transducer Readings are Unstable Is the readout box position set correctly? If using a datalogger to record readings automatically are the swept frequency excitation settings correct? Try reading the transducer on a different readout position. -
Page 18: Appendix A - Specifications
APPENDIX A - SPECIFICATIONS A.1. Model A-9 Retrievable Extensometer Transducer 12, 25, 50 mm Ranges Available: 0.5, 1, 2" 100% (none) Overrange: Accuracy: 0.1% (with polynomial expression) Resolution: 0.025% FSR 0.25% FSR Linearity: Thermal Zero Shift: < 0.05% FSR/°C Stability: <... -
Page 19: Appendix B - Thermistor Temperature Derivation
APPENDIX B - THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: 273 2 A B LnR C LnR Equation B-1 Convert Thermistor Resistance to Temperature T Temperature in C. Where;... -
Page 20: Appendix C - Anchor Pull Out Test Results
APPENDIX C - ANCHOR PULL OUT TEST RESULTS Pull out tests were conducted with the Model A-9 anchors installed in stainless steel and PVC pipes to determine the force necessary to fail the anchors. The results are presented in the following chart. Retrievable Extensometer (Model A-9) Anchor Pull Out Tests 4 Piston Anchor Stainless Steel Pipe... -
Page 21: Appendix D - Swagelok Fitting Assembly Instructions
APPENDIX D - SWAGELOK FITTING ASSEMBLY INSTRUCTIONS...