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Geokon 4600 Instruction Manual

Vw settlement sensor
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Instruction Manual
Model 4600
VW Settlement Sensor
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 © 1984, 2004, 2009, 2011, 2013, 2015 by Geokon, Inc.
(Doc Rev J, 10/15)

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Summary of Contents for Geokon 4600

  • Page 1 VW Settlement Sensor 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.
  • Page 3 13 months from date of purchase. If the unit should malfunction, it must be returned to the factory for evaluation, freight prepaid. Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge.

  • Page 4: Table Of Contents

    TABLE of CONTENTS 1. GENERAL DESCRIPTION ..........................1 2. INSTALLATION PROCEDURES ........................3 3. TAKING READINGS ............................4 3.1. Measuring Temperatures ............................ 5 4. DATA REDUCTION ............................5 4.1 Corrections for temperature ..........................6 5. MAINTENANCE AND TROUBLE SHOOTING ................... 8 APPENDIX A: THERMISTOR LINEARIZATION USING STEINHART AND HART LOG EQUATION ....................................

  • Page 5: General Description

    1. GENERAL DESCRIPTION The 4600 Settlement System is designed to measure the settlement of a point relative to a point located immediately below it, in solid ground (bedrock). The usual method of installation is shown in Figure 1. Figure 1. Model 4600 V.W. Settlement System.
  • Page 6 This arrangement ensures that the sensor readings are not influenced by temperature changes inside the reservoir, or by changes in barometric pressure. Details of the reservoir assembly are shown in Figure 2. Figure 2. Model 4600 Settlement System – Reservoir Details...

  • Page 7: Installation Procedures

    3 times the anticipated maximum settlement. Thus if the anticipated maximum settlement is 0.5 meters, the sensor/reservoir spacing can be as close as 1.5 meters. The Model 4600 Assembly is usually shipped with the liquid tube pre-filled with de-aired liquid. The liquid tube is of such a length to accommodate the spacing between sensor and reservoir specified at the time of ordering.

  • Page 8: Taking Readings

    To put the 4600 system into service it is necessary, first, to grip the Swagelok cap holding the travelling tube and pull the reservoir plug out of the top of the reservoir, (the larger of the two Delrin plugs).

  • Page 9: Measuring Temperatures

    position B. Where a Datalogger is used the frequency limits should be set between 1400 to 3500 H The black and red conductors are connected to the vibrating wire sensor and the green and white conductors to the thermistor. When taking initial readings conduct a level survey to determine the elevation, E , of the settlement flange.

  • Page 10: Corrections For Temperature

    E = 541.15 meters Or, in other words, there has been a settlement of 0.47 meters. 4.1 Corrections for temperature Usually, since the 4600 system is completely buried, temperature effects are negligible. The temperature correction to the elevation, E is given by: –...
  • Page 11 Figure 3. Typical Calibration Sheet...

  • Page 12: Maintenance And Trouble Shooting

    5. MAINTENANCE AND TROUBLE SHOOTING Since all the 4600 Settlement System components are buried there is no maintenance to observe and little can be done in the event the readings become suspect. Unstable readings, especially with data loggers, may be caused by electrical noise from nearby power lines or electrical equipment.

  • Page 13: Appendix A: Thermistor Linearization Using Steinhart And Hart Log Equation

    Appendix A: Thermistor Linearization using Steinhart and Hart Log Equation Tech Memo 91-03 Doc Rev 6-94, Geokon, Inc. Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3   Basic Equation: 273 2   A B LnR C LnR T  Temperature in C.

  • Page 14: Appendix B: Model 4600M Multilevel Settlement Monitoring System General

    Appendix B: Model 4600M Multilevel Settlement Monitoring System General Description The Model 4600M multilevel is designed for installation in boreholes: it is not recommended for installation in fills while the fill is being placed. A drawing of the complete assembly is shown in figure 4. Figure 4 A Typical 4600M assembly It comprises a series of spring loaded anchors, each anchor containing, at the top, a sensor and at the bottom a reservoir.
  • Page 15 Figure 5 Typical Anchor Assembly...
  • Page 16 Each reservoir is connected via a fluid filled tube to the sensor on the anchor below. The lowest sensor is mounted to a pipe embedded in the bedrock and the upper reservoir is connected to a settlement plate at the top of the bore hole. A more detailed drawing of the top reservoir and settlement plate is shown below in Figure 6.

  • Page 17: Installation Instructions

    To put the 4600 system into service it is necessary to connect the reservoir chamber to the desiccant chamber using the U-tube supplied, (see Figure 6). This operation must be performed as each reservoir is about to be lowered into the borehole.
  • Page 18 Repeat the above until all the sensor and reservoirs have been lowered into the borehole and the top reservoir is at or close to ground level. As the assembly is lowered into the borehole, more than one person will be required to organize and control the various trip cords and cables as they are lowered into the borehole.

  • Page 19: Appendix C: Specifications

    Appendix C: Specifications Model 4500AL 1 Available Ranges 2 (ft) 0-10, 0-20, 0-50 3, 7, 15, Available Ranges 2 (m) Resolution 0.025% FS Linearity 0.5% FS 3 Accuracy 1 0.1% FS 4 2  FS Over-Range Thermal <0.05% FS/ Coefficient °C Frequency Range 1400-3500Hz...

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