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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 © 1984-2018 by Geokon, Inc.
Doc Rev L 03/19/2018

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Summary of Contents for Geokon 4600

  • Page 1 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.
  • 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...

  • Page 5: Table Of Contents

    TABLE of CONTENTS 1. GENERAL DESCRIPTION ........................... 1 2. INSTALLATION PROCEDURES ........................3 2.1 S ......................... 3 ETTLEMENT YSTEM NSTALLATION 2.2 S ......................4 WAGELOK ITTING NSTRUCTIONS 2.2.1 Installation ..............................4 2.2.2 Reassembly Instructions ..........................5 3. TAKING READINGS ............................. 7 3.1 GK-404 R ............................
  • Page 6 FIGURES 1 - M 4600 VW S ..................... 1 IGURE ODEL ETTLEMENT YSTEM 2 - R ............................ 2 IGURE ESERVOIR ETAILS 3 - T ............................4 IGURE NSERTION 4 - M O’ ......................... 4 IGURE AKE A ARK AT CLOCK 5 - T ....................

  • Page 7: General Description

    (For instructions regarding Model 4600M Multilevel Settlement System, see Appendix C.) 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.

  • Page 8: Figure 2 - Reservoir Details

    The settlement plate, usually located at the ground surface, (i.e., the elevation of the mouth of the borehole) settles with the ground, thus altering the height of the liquid column inside the liquid tube above the sensor. The sensor detects the change in liquid pressure, which is read by means of an electrical cable running to the readout location.

  • Page 9: Installation Procedures

    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 10: Swagelok Tube Fitting Instructions

    While holding the reservoir in an upright position at all times, attach the settlement flange and plate to the reservoir using the two machine screws provided, or by using PVC cement obtained locally. (Federal Regulations prohibit the shipment of PVC cement). Apply PVC cement to the inside of the reservoir extension (see Figure 2) and to the outside of the top of the reservoir housing.

  • Page 11: Reassembly Instructions

    4) While holding the fitting body steady, tighten the nut one and one quarter turns, until the mark is at the nine o’clock position. (Note: For 1/16", 1/8", 3/16", and 2, 3, and 4 mm fittings, tighten the nut three-quarters of a turn until the mark is at the three o’clock position.) Figure 5 - Tighten One and One-Quarter Turns 2.2.2 Reassembly Instructions...

  • Page 12: Figure 7 - Ferrules Seated

    Figure 7 - Ferrules Seated Against Fitting Body 5) While holding the fitting body steady, rotate the nut with a wrench to the previous position as indicated by the marks on the tube and the connector. At this point, there will be a significant increase in resistance.

  • Page 13: Taking Readings

    20 hours continuously on two AA batteries. It is designed for the readout of all Geokon vibrating wire gages 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 transducer (embedded thermistor) with a resolution of 0.1 °C.

  • Page 14: Gk-405 Readout Box

    If the sensor cable has flying 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 15: Gk-403 Readout Box (Obsolete Model)

    If the sensor cable has flying 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 16: Data Reduction

    In other words, there has been a settlement of 0.47 meters. 4.1 Corrections for Temperature The 4600 system is usually completely buried; therefore, temperature effects are negligible. Should temperature correction be required, the temperature correction to the elevation (E ) is...

  • Page 17: Figure 11 - Typicals

    Figure 11 - Typical Settlement System Calibration Report...

  • Page 18: Figure 12 - Typicalp

    Figure 12 - Typical Pressure Transducer Calibration Report...

  • Page 19: 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 20: 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) -273.2 Equation 3 - Resistance to Temperature Where; T = Temperature in °C. LnR = Natural Log of Thermistor Resistance. A = 1.4051 ×...

  • Page 21: Appendix C. Model 4600M, Multilevel Settlement System

    APPENDIX C. MODEL 4600M, MULTILEVEL SETTLEMENT SYSTEM C.1 General Description The 4600M Multilevel Settlement System is designed to measure settlement in multiple zones within a settling soil mass. It is comprised of a series of anchors, which can be hydraulically or manually released when the sensor is at its desired location.

  • Page 22: Figure 14 - Topr

    The 4600M Multilevel Settlement System is designed for installation in boreholes. It has the disadvantage of requiring a borehole to reach solid ground, but has the distinct advantage of avoiding long horizontal runs of liquid-filled tubing to a remote readout location. It can be used to monitor subsurface settlements at different elevations, and is particularly suited to the measurement of settlements below sand islands constructed in marine environments.

  • Page 23: Borehole Requirements

    Sensor output is conducted by means of an electrical cable to the readout location where it is read by a portable readout. Datalogger systems, which allow remote, unattended data collection of multiple sensors, are also available. Contact Geokon for additional information. C.2 Borehole Requirements Installation generally requires a borehole to be drilled.
  • Page 24 To put the 4600M system into service, the traveling tube must be removed. The string of sensor/reservoir combinations can be assembled horizontally along the ground surface before the traveling tube has been removed. Once the traveling tube has been removed it is very important that the reservoir is kept upright.

  • Page 25: Hydraulically Activated Borros Anchor Systems

    C.5 Hydraulically Activated Borros Anchor Systems Figure 15 shows the standard single point Borros anchor assembly with the anchors retracted (left) and activated (right). The system is also available in a double point Borros anchor configuration for installations with sensor spacing greater than six meters (Figure 16). Figure 16 - Double Point Anchor Figure 15 - Single Point Anchor C.5.1 Installation Instructions for Hydraulic Anchors...
  • Page 26 Tie a nylon cord to the top reservoir and the signal cable. Suspend the 4600M by tying the nylon cord to the top of the drill mast in such a way that the casing can slide over and around the top reservoir and signal cable as it is removed from the borehole. When all the sensors and reservoirs have been lowered into the hole, the removal of the casing can begin (if the borehole is cased).

  • Page 27: Manual Spider Anchors

    C.6 Manual Spider Anchors Figure 17 - Typical Manual Spider Anchor Assembly C.6.1 Installation Instructions for Manual Spider Anchors The bottom sensor is usually anchored in solid ground and serves as a stable datum point to which all the other sensors are referred. The bottom sensor may be attached to a length of pipe and grouted in place, as described in Section 2.1, or it may be anchored to the walls of the borehole by means of a Hydraulic Bladder type borehole anchor.
  • Page 28 Tie a nylon cord to the top reservoir and the signal cable. Suspend the 4600M by tying the nylon cord to the top of the drill mast in such a way that the casing can slide over and around the top reservoir and signal cable as it is removed from the borehole. More than one person will be required to organize and control the various hydraulic leads/pull- cords, tubes, and cables as the assembly is lowered into the borehole.

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