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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, 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 © 2003-2016 by Geokon, Inc.
(Doc Rev J, 11/10/16)

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Summary of Contents for Geokon 4427

  • Page 1 VW Long Range Displacement Meter 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 The buyer's sole remedy for any breach of this agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the purchase price paid by the purchaser to Geokon, Inc.

  • Page 4: Table Of Contents

    TABLE of CONTENTS   1. INTRODUCTION ..............................6   2. SYSTEM COMPONENTS ............................. 6   3. INSTALLATION ..............................7   3.1 P ..............................7 OUNTED   3.2 P ............................8 EDESTAL OUNTED   3.3 I ..................9 NSTALLING THE WEAK LINK AND EXTENSION CABLE  ...
  • Page 5 1: S ......................6 IGURE HOWING THE INTERNAL MECHANISM   2: T ............................7 IGURE HE WEAK LINK   3: M 4427 L ............7 IGURE ODEL ANGE ISPLACEMENT ETER PIPE MOUNTED   4: M 4427 L ..........8 IGURE...

  • Page 6: Introduction

    1. INTRODUCTION The Geokon Model 4427 Long Range Displacement Meter, (LRDM), is designed to measure displacements of up to 2 meters magnitude between two points. Typical applications include the monitoring of crack openings due to mining, and the monitoring of unstable slopes.

  • Page 7: Installation

    The second moving point should consist of a similar 3 inch pipe grouted or wedged in place at the desired distance from the first mounting point. Figure 3 shows a typical set-up Figure 3: Model 4427 Long Range Displacement Meter pipe mounted...

  • Page 8: Pedestal Mounted

    Mounting Plate, these holes are then used to install ¼ inch Rawl drop in anchors for concrete, (available through Geokon), or ¼ inch lag screws in wood. A typical set up is shown in figure 4 on the next page. Instructions for the Rawl drop-in anchors are as follows: 1.

  • Page 9: Installing The Weak Link And Extension Cable

    3.3 Installing the weak link and extension cable The extension cable is used to cover the distance between the two points. A length of plastic coated 1/16 inch aircraft cable is supplied for this purpose. The cable has two loops which are shipped loosely held by two cable clamps.

  • Page 10: Electrical Noise

    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 may be appropriate to install lightning protection components, as the transient could travel down the cable to the gage and possibly destroy it.

  • Page 11: Taking Readings

    4. TAKING READINGS. Readings can be taken using either a GK403, GK404 or GK405 Readout Box, or by means of the Micro10 Datalogger. For more details on these please consult the appropriate Manual. The all Readout Boxes should be switched to Channel B. If no connector is provided then the following wiring diagram must be observed: Red ….VW Transducer Black….VW Transducer...

  • Page 12: Operation Of The Gk-405 Readout Box

    4.3. Operation of the GK-405 Readout Box The GK-405 Vibrating Wire Readout is made up of two components:  The Readout Unit, consisting of a Windows Mobile handheld PC running the GK-405 Vibrating Wire Readout Application  The GK-405 Remote Module which is housed in a weather-proof enclosure and connects to the vibrating wire sensor by means of: 1) Flying leads with alligator type clips when the sensor cable terminates in bare wires or, 2) By means of a 10 pin connector..

  • Page 13: Measuring Temperatures

    4.4 Measuring Temperatures Each Vibrating Wire Displacement Transducer is equipped with a thermistor for reading temperature. The thermistor gives a varying resistance output as the temperature changes. Usually the white and green leads are connected to the internal thermistor. {The GK-401 readout box does not read temperatures –...

  • Page 14: Data Reduction

    Displacement = D = (R 1 - R 0 )  F Equation 1 – Displacement Calculation where F is the system calibration factor, (in mm or inches per digit), taken from the 4427 long range displacement transducer calibration report supplied with the equipment. A typical calibration sheet for the 4427 long range system is shown in Figure 8.

  • Page 15: The Extension Cable

    K = MR 1  B Equation 3 - Thermal Coefficient Calculation Where: R 1 is the current reading. M is the multiplier from Table 1. B is the constant from Table 1. Model: 4427-1-1M 4427-1-2M Multiplier (M): 0.000369 0.000376 Constant (B): 0.572 0.328...
  • Page 16 Figure 8: A typical Calibration Sheet for the 4427 Long Range Displacement System...
  • Page 17 Figure 9: A Typical Calibration Sheet for the Model 4400 Transducer used in the 4427 system.

  • Page 18: 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 19: Appendix A - Specifications

    APPENDIX A - SPECIFICATIONS A.1. Model 4427 Long Range Displacement Meter Range: 1 meters 2 meter 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: 18Kgm Dimensions 590 x 150 x 150 mm...

  • Page 20: Appendix B - Thermistor Temperature Derivation

    APPENDIX B - THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3   273 2   A B LnR C LnR Equation B-1 Convert Thermistor Resistance to Temperature T  Temperature in C. where: LnR  Natural Log of Thermistor Resistance A ...

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