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Instruction Manual
Model 4370
Concrete Stressmeter
No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon
®
.
The information contained herein is believed to be accurate and reliable. However, Geokon
®
assumes no responsibility for errors,
omissions or misinterpretation. The information herein is subject to change without notification.
Copyright © 2003-2019 by Geokon
®
(Doc Rev G, 05/1/19)
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Summary of Contents for Geokon 4370
- Page 1 Instruction Manual Model 4370 Concrete Stressmeter No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon ® The information contained herein is believed to be accurate and reliable. However, Geokon ® assumes no responsibility for errors, omissions or misinterpretation.
- Page 3 Geokon or any breach of any warranty by Geokon shall not exceed the purchase price paid by the purchaser to Geokon for the unit or units, or equipment directly affected by such breach. Under no circumstances will Geokon reimburse the claimant for loss incurred in removing and/or reinstalling equipment.
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Page 5: Table Of Contents
TRESS ALCULATION 6.2. T ....................9 EMPERATURE ORRECTION 7. TROUBLESHOOTING ......................10 APPENDIX A. SPECIFICATIONS ..................11 A.1 4370 C ................... 11 ONCRETE TRESSMETER A.2 T ........................11 HERMISTOR APPENDIX B. THERMISTOR TEMPERATURE DERIVATION........12 APPENDIX C. TYPICAL CALIBRATION REPORT ............13... - Page 6 – R ................. 6 IGURE EADINGS EADINGS 8 - T ................... 13 IGURE YPICAL ALIBRATION EPORT TABLES 1 - 4370 S ....................11 ABLE PECIFICATIONS 2 - T ............12 ABLE HERMISTOR ESISTANCE VERSUS EMPERATURE EQUATIONS 1 - D ) ..........8...
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Page 7: Introduction
The Model 4370 Concrete Stressmeter is designed to overcome these problems by, in effect, making a stressmeter out of concrete so that it will have the same properties of shrinkage/swelling, modulus variation, temperature dependence, and creep potential, as the surrounding concrete. -
Page 8: Installation
3. INSTALLATION The Stressmeter is first wrapped in A Tyvec type material for additional de-bonding power. The stressmeter is then positioned in line with the direction in which the stress is to be measured and is tied off to the rebar cage or a small size supplemental rebar cage, using iron wire, or nylon tie- wraps. - Page 9 Figure 4 - Another typical stress meter installation...
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Page 10: Lightning Protection
Terminal boxes and multiplexers available from Geokon provide locations for installation of these components. Lighting arrestor boards and enclosures are available from Geokon that install at the exit • point of the instrument cable from the structure being monitored. The enclosure has a removable top so, in the event the protection board (LAB-3) is damaged, the user may service the components (or replace the board). -
Page 11: Taking Readings
20 hours on two AA batteries. It is designed for the readout of all Geokon vibrating wire gauges and transducers; and is capable of displaying the reading in either digits, frequency (Hz), period (µs), or microstrain (µε). The GK-404 also displays the temperature of the stressmeter (embedded thermistor) with a resolution of 0.1 °C. -
Page 12: Gk-405 Readout Box
Connecting sensors with bare leads: Attach the GK-403-2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors, with blue representing the shield (bare). -
Page 13: Gk-403 Readout Box (Obsolete Model)
Connecting Sensors with Bare Leads: Attach the GK-403-2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors, with blue representing the shield (bare). -
Page 14: Data Reduction
6. DATA REDUCTION 6.1 Stress Calculation To convert digits to concrete stress, use the linear or polynomial equation from the calibration report provided with the stressmeter. See Appendix C for a sample calibration report The linear equation is as follows: Concrete Stress (S) = (R –... -
Page 15: Temperature Correction
S = 6.658E-07*5219^2 - 0.009799*5219+101.44 = 32.41 MPa Compare these values to the actual applied stress of 32.47MPa 6.2. Temperature Correction The Model 4370 Concrete Stressmeter has a coefficient of thermal expansion very similar to the concrete surrounding it so in most cases correction is not necessary. -
Page 16: Troubleshooting
7. TROUBLESHOOTING Maintenance and troubleshooting of concrete stressmeters is confined to periodic checks of cable connections and maintenance of terminals. Once installed, the gages are usually inaccessible and remedial action is limited. Consult the following list of problems and possible solutions should difficulties arise. Consult the factory for additional troubleshooting help. -
Page 17: Appendix A. Specifications
⨉ ⨉ Temperature Range -20 to +80 °C Length Diameter 76 mm (I.D. 66 mm) Table 1 - 4370 Specifications Notes: Load cell accuracy Other ranges available on request A.2 Thermistor (See Appendix B also) Range: -80 to +150° C... -
Page 18: Appendix B. Thermistor Temperature Derivation
APPENDIX B. THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: A+B ( LnR ) +C(LnR) -273.15 °C Equation 4 - Resistance to Temperature Where; T = Temperature in °C. LnR = Natural Log of Thermistor Resistance. A = 1.4051 ×... -
Page 19: Appendix C. Typical Calibration Report
APPENDIX C. TYPICAL CALIBRATION REPORT Figure 8 - Typical Calibration Report...
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