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Geokon 4427 Instruction Manual

Vw long range displacement meter
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Instruction Manual
Model 4427
VW Long Range Displacement Meter
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 L, 05/31/19)

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Summary of Contents for Geokon 4427

  • Page 1 Instruction Manual Model 4427 VW Long Range Displacement Meter 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 ®...
  • 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.

  • Page 5: Table Of Contents

    5.2.1 The Transducer Alone ..........................10 5.2.2 The Extension Cable ........................... 11 5.3 E ..........................12 NVIRONMENTAL ACTORS 6. TROUBLESHOOTING ............................13 APPENDIX A. SPECIFICATIONS ......................... 14 A.1 M 4427 L ..................14 ODEL ANGE ISPLACEMENT ETER A.2 T ) ......................14 HERMISTOR...
  • Page 6 FIGURES 1 - 4427 I ........................1 IGURE NTERNAL ECHANISM 2 - T ............................2 IGURE 3 - P ................3 IGURE OUNTED ANGE ISPLACEMENT ETER 4 - P ............... 4 IGURE EDESTAL OUNTED ANGE ISPLACEMENT ETER 5 - A T ...................

  • Page 7: Introduction

    1. INTRODUCTION The Geokon Model 4427 Long Range Displacement Meter, (LRDM), is designed to measure displacements of up to two meters magnitude between two points. Typical applications include the monitoring of crack openings due to mining, and the monitoring of unstable slopes.

  • Page 8: System Components

    This standpipe can be provided by the installer or is available at Geokon. Also included with the enclosure is a “weak link” for attachment between the tensioned aircraft cable inside the sensor enclosure and the extension cable, which stretches between the two points being monitored.

  • Page 9: Installation

    Mounting Plate, these holes are then used to install 1/4-inch Rawl drop in anchors for concrete, (available through Geokon), or 1/4-inch lag screws in wood. A typical set up is shown in Figure 4 on the following page. Instructions for the Rawl drop-in anchors are...

  • Page 10: Installing The Weak Link And Extension Cable

    Insert the expansion anchors into the holes, with the slotted end down and then, insert the setting tool provided, small end first, into the anchor and expand the anchor by hitting the large end of the setting tool with several sharp hammer blows. Figure 4 - Pedestal Mounted Long Range Displacement Meter 3.3 Installing the Weak Link and Extension Cable The extension cable is used to cover the distance between the two points.

  • Page 11: Lectrical Oise

    Geokon dataloggers and readouts should difficulties arise. 3.6 Lightning Protection The Model 4427 Vibrating Wire Long Range Displacement Meter can be supplied with integral lightning protection components, i.e. transzorbs or plasma surge arrestors. If the instrument cable is exposed, it might be appropriate to install lightning protection components, as the transient could travel down the cable to the gauge and possibly destroy it.
  • Page 12 Lighting arrestor boards and enclosures are available from Geokon that can be installed • inside the enclosure. The enclosure has a hinged lid, so that if the protection board (LAB-3) is damaged, the user can service the components (or replace the board). A connection is made between this enclosure and earth ground to facilitate the passing of transients away from the gauge.

  • Page 13: 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 transducer (embedded thermistor) with a resolution of 0.1 °C.

  • Page 14: Gk-405 Readout Box

    4.2.2 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 15: Gk-403 Readout Box (Obsolete Model)

    4.3.2 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 16: Data Reduction

    3000 digits.) is a subsequent reading. F is the linear gauge factor (in mm or inches per digit), taken from the model 4427 calibration report supplied with the equipment. Figure 9 in Appendix C.1 shows a typical model 4427 long range displacement transducer calibration report.

  • Page 17: The Extension Cable

    Equation 3 - Thermally Corrected Displacement Calculation Where; F is the linear gauge factor (in mm or inches per digit) from the model 4427 calibration report supplied with the equipment. (Figure 9 in Appendix C.1 shows a typical model 4427 long range displacement transducer calibration report.) is the current reading.

  • Page 18: Environmental Factors

    5.3 Environmental Factors Since the purpose of the displacement transducer installation is to monitor site conditions, factors, which may affect these conditions, should always be observed and recorded. Seemingly minor effects can have a real influence on the behavior of the situation being monitored and may give an early indication of potential problems.

  • Page 19: Troubleshooting

    6. TROUBLESHOOTING Consult the following list of problems and possible solutions should difficulties arise. Consult the factory for additional troubleshooting help. Symptom: Displacement 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 displacement transducer on a different readout position.

  • Page 20: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS A.1 Model 4427 Long Range Displacement Meter Range: 1 meter 2 meters Resolution: 0.025% FS Linearity: 0.5% FS Stability: < 0.2%/yr (under static conditions) Overrange: Cable Tension: 7 to 13 Kgm Weak-Link Capacity: 18 Kgm Dimensions Enclosure:...

  • Page 21: 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 6 - Resistance to Temperature Where; T = Temperature in °C. LnR = Natural Log of Thermistor Resistance A = 1.4051 ×...

  • Page 22: Appendix C. Typical Calibration Reports

    APPENDIX C. TYPICAL CALIBRATION REPORTS C.1 Model 4427 Calibration Report Figure 9 - Typical Calibration Report for Model 4427 Long Range Displacement Transducer...

  • Page 23: Model 4400 Calibration Report

    C.2 Model 4400 Calibration Report Figure 10 - Typical Calibration Report for Model 4400 Displacement Transducer...

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