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Geokon 4450 Instruction Manual

Vw displacement transducer
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Instruction Manual
Model 4450
VW Displacement Transducer
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 © 1994-2016 by Geokon, Inc.
(Doc Rev M 11/10/16)

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Summary of Contents for Geokon 4450

  • Page 1 Model 4450 VW Displacement Transducer 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 5: Table Of Contents

    ORRECTION   4.3. E ......................... 8 NVIRONMENTAL ACTORS   5. TROUBLESHOOTING ..........................10   APPENDIX A - SPECIFICATIONS ....................... 11   A.1. M 4450 D ..................... 11 ODEL ISPLACEMENT RANSDUCER   A.2 T ) ......................11 HERMISTOR PPENDIX ALSO  ...
  • Page 6 LIST of FIGURES, TABLES and EQUATIONS Page   1 - M 4450 D ..................1 IGURE ODEL ISPLACEMENT RANSDUCER   1 - M 4450 R ..............2 ABLE ODEL EADING VERSUS OSITION IN THE ANGE   2 - L ..................... 3...

  • Page 7: Introduction

    Transducer Housing Alignment Pin Alignment Slot Figure 1 - Model 4450 Displacement Transducer CAUTION: Do not rotate the shaft of the Displacement Transducer. This may cause irreparable damage to the instrument. The alignment pin on the transducer shaft and slot on the body serve as a guide for alignment.

  • Page 8: Displacement Transducer Installation

    6500 4000 100, 150 mm Table 1 - Model 4450 Reading versus Position in the Range 2.3. Cable Installation The cable should be routed in such a way so as to minimize the possibility of damage due to moving equipment, debris or other causes. Cables may be spliced to lengthen them, without affecting gage readings.

  • Page 9: Initial Readings

    2.6. Lightning Protection The Model 4450 Vibrating Wire Displacement Transducers, unlike numerous other types of instrumentation available from Geokon, do not have any integral lightning protection components, i.e. transzorbs or plasma surge arrestors. Usually this is not a problem...

  • Page 10: Taking Readings

    3. TAKING READINGS 3.1. Operation of the GK-403 Readout Box The GK-403 can store gage readings and also apply calibration factors to convert readings to engineering units. Consult the GK-403 Instruction Manual for additional information on Mode "G" of the Readout. The following instructions will explain taking gage measurements using Mode "B".

  • Page 11: Operation Of The Gk-405 Readout Box

    3.3 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 12: Data Reduction

    4. DATA REDUCTION 4.1. Displacement Calculation The basic units utilized by Geokon for measurement and reduction of data from Vibrating Wire Displacement Transducers are "digits". Calculation of digits is based on the following equation;       ...

  • Page 13: Temperature Correction

    4.2. Temperature Correction The Model 4450 Vibrating Wire Displacement Transducers have a small coefficient of thermal expansion so in many cases correction may not be necessary. However, if maximum accuracy is desired or the temperature changes are extreme (>10° C) corrections may be applied.

  • Page 14: Environmental Factors

    Consider the following example from Figure 4, using a Model 4450-25 mm Displacement Transducer; R 0 = 4250 digits R 1 = 6785 digits T 0 = 10° C T 1 = 20° C G = 0.004457 mm/digit  ...

  • Page 15: Sheet

    Figure 4 A Typical Calibration Sheet.

  • Page 16: Troubleshooting

    5. 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 17: Appendix A - Specifications

    Length mm (inches) 194 (7.6) 200 (7.9) 280 (11.1) 393(15.5) 510(20.1) Table A-1 Model 4450 Displacement Transducer Specifications Notes: ¹ Minimum, greater resolution possible depending on readout. ² Depends on application. ³ Polyurethane jacket cable available. A.2 Thermistor (see Appendix B also) Range: -80 to +150°...

  • 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:   273 2   A B LnR C LnR Equation B-1 Convert Thermistor Resistance to Temperature T  Temperature in C. where: LnR ...

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