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Geokon 1300, Instruction Manual

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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)

Summary of Contents for 1300

Page 1: ...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 ...

Page 2: ......

Page 3: ...re are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon Inc is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result of t...

Page 4: ......

Page 5: ...INGS 5 3 1 OPERATION OF THE GK 401 READOUT BOX 5 3 2 OPERATION OF THE GK 403 READOUT BOX 5 3 3 OPERATION OF THE GK404 READOUT BOX 6 3 4 MEASURING TEMPERATURES 6 4 DATA REDUCTION 7 4 1 DIGITS 7 4 2 TEMPERATURE CORRECTION 9 5 TROUBLESHOOTING 11 APPENDIX A SPECIFICATIONS 12 APPENDIX B THERMISTOR TEMPERATURE DERIVATION 13 APPENDIX C ANCHOR PULL OUT TEST RESULTS 14 APPENDIX D SWAGELOK FITTING ASSEMBLY ...

Page 6: ...UNITS CONVERSION MULTIPLIERS 7 FIGURE 3 TYPICAL CALIBRATION SHEET 8 TABLE 2 THERMAL COEFFICIENT CALCULATION CONSTANTS 9 TABLE 3 THERMAL COEFFICIENTS OF EXPANSION FOR VARIOUS ROD MATERIALS 10 TABLE A 1 MODEL A 9 TRANSDUCER SPECIFICATIONS 12 TABLE B 1 THERMISTOR RESISTANCE VERSUS TEMPERATURE 13 FIGURE C 1 ANCHOR PULL OUT TEST RESULTS 14 ...

Page 7: ...s that are connected to one another in series by a single connecting rod When installed the anchors are fixed in place and the transducers measure the deformation between the anchor positions The connecting rods are held in tension to eliminate errors due to bowing and friction Connecting rods of fiberglass graphite epoxy and stainless steel are available The standard system is designed to be used...

Page 8: ...while the anchor is not inside a tube the pistons will over range and in the process the O ring seals will be damaged and the pistons will then be unable to hold pneumatic pressure without leaking 2 2 Extensometer Installation If the transducers check out the assembly can proceed An adequate area must be located for the assembly of the extensometer Preferably it should be as long as the extensomet...

Page 9: ...ng for the inflation line Finger tighten and then turn an additional 7 flats 1 turns to engage the ferrule See Appendix D for additional Swagelok fitting assembly instructions 4 Lay out all the transducer cables and inflation lines next to the anchors and attached rods Position the lines and cables in the slots of the anchors and tape on either side of the anchors i e tape above the anchor around ...

Page 10: ...nt at mid range the reading should be around 5000 digits To measure mostly tensile strains the reading should be around 3000 To measure mostly compressive strains the reading should be around 7000 Repeat this procedure for each transducer position of the extensometer Installation complete 2 3 Cable Splicing Cables may be spliced to lengthen them without affecting gage readings Always waterproof th...

Page 11: ...f the GK 403 Readout Box The GK 403 can store gage readings and also apply calibration factors to convert readings to engineering units Consult the GK 403 Instruction Manual for additional information on Mode G of the Readout The following instructions will explain taking gage measurements using Mode B Connect the Readout using the flying leads or in the case of a terminal station with a connector...

Page 12: ...the automatic Power Off timer shuts the GK 404 off The GK 404 continuously monitors the status of the 2 1 5V AA cells and when their combined voltage drops to 2V the message Batteries Low is displayed on the screen A fresh set of 1 5V AA batteries should be installed at this point 3 4 Measuring Temperatures The vibrating wire transducers used in the Model A 9 Retrievable Extensometer is equipped w...

Page 13: ...2 4 G is the calibration factor usually in terms of millimeters or inches per digit taken from the calibration sheet an example of which is shown in Figure 3 F is an engineering units conversion factor optional see Table 1 From To Inches Feet Millimeters Centimeters Meters Inches 1 12 0 03937 0 3937 39 37 Feet 0 0833 1 0 003281 0 03281 3 281 Millimeters 25 4 304 8 1 10 1000 Centimeters 2 54 30 48 ...

Page 14: ... 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 Figure 3 Typical Calibration sheet ...

Page 15: ...he change in gage length LR is the correction for the change in rod length Tests have determined that the Thermal Coefficient K of the transducer changes with the position of the transducer shaft Hence the first step in the temperature correction process is determination of the proper Thermal Coefficient based on the following equation Thermal Coefficient Reading in Digits Multiplier Constant Cali...

Page 16: ...e rod material from Table 3 Rod Material KRThermal Coefficient Per º C Stainless Steel 17 3 x 10 6 Graphite 0 2 x 10 6 Fiberglass 6 0 x 10 6 Table 3 Thermal coefficients of expansion for various rod materials Example for the same 25mm range transducer as before where the anchor spacing is 144 inches and the rods are fiberglass R1 4523 To 15 degrees C T1 30 degrees C S 144 10 5 133 5 inches Then K ...

Page 17: ... another transducer If not the readout may have a low battery or be malfunctioning Consult the appropriate readout manual for charging or troubleshooting directions Symptom Transducer Fails to Read Is the cable cut or crushed This can be checked with an ohmmeter Nominal resistance between the two gage leads usually red and black leads is 180 10 Remember to add cable resistance when checking 22 AWG...

Page 18: ...onditions Temperature Range 40 to 60 C 40 to 120 F Frequency Range 1200 2800 Hz Coil Resistance 180 10 Cable Type 2 2 twisted pair 4 conductor 22 AWG Foil shield PVC jacket nominal OD 4 8 mm 0 1875 Weight 1 kg 2 2 lbs Rod Types Stainless steel fiberglass graphite Table A 1 Model A 9 Transducer Specifications Notes 1 Consult the factory for other ranges available 2 Consult the factory for alternate...

Page 19: ...3 342 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6...

Page 20: ...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 0 50 100 150 200 250 300 150 200 300 440 Applied Pressure in Psi Pull Out in Lbs Stainless Steel Pipe PVC Pipe 4 Piston Anchor Figure C 1 Anchor Pull Out Test Results ...

Page 21: ...15 APPENDIX D SWAGELOK FITTING ASSEMBLY INSTRUCTIONS ...

Page 22: ...16 ...

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