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Geokon LVRA1230B Instruction Manual

Liquid level sensor
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Instruction Manual
Model 4675
Liquid Level 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 © 1995, 2006, 2008 by Geokon, Inc.
(Doc Rev F, 04/08)

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Summary of Contents for Geokon LVRA1230B

  • Page 1 Liquid Level 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 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

    TABLE of CONTENTS 1. INTRODUCTION AND THEORY OF OPERATION ................... 1 2. INSTALLATION ..............................2 2.1 I ......................... 2 NSTALL THE MOUNTING BRACKETS 2.2 A ........................... 2 TTACHING THE FLUID LINES 2.3 I ..........................3 NSTALLING THE SENSORS 2.4 T .
  • Page 6 LIST of FIGURES, TABLES and EQUATIONS 1. M 4675 L ............1 IGURE ODEL IQUID EVEL ENSOR RINCIPLE OF PERATION 2. I ........................... 2 IGURE NSTALLATION ETAILS 3. D ......6 IGURE ENSITY P OF PURE WATER AS A FUNCTION OF TEMPERATURE AND PRESSURE INTENSITY ............

  • Page 9: Introduction And Theory Of Operation

    Readout of the instruments is accomplished with portable readouts such as the GK-403 or the GK-404 or one of the Geokon data acquisition systems such as the Micro-10. Figure 1. Model 4675 Liquid Level Sensor - Principle of Operation...

  • Page 10: Installation

    2. Installation Before any attempt is made to install the sensors the following directions must be read and understood. The vibrating wire transducer is very sensitive and correspondingly fragile, and must be handled with great care. Figure 2. Installation Details 2.1 Install the mounting brackets The first step is to install the mounting brackets.

  • Page 11: Installing The Sensors

    below the last chamber has one side of the Tee plugged. The intermediate chambers use valves with barb connectors on both sides. 2.3 Installing the sensors THIS OPERATION IS VERY CRITICAL AND SHOULD BE PERFORMED WITH EXTREME CARE. A spring and a stop protect the load sensor from over-range but severe dynamic shocks can destroy the vibrating wire element.

  • Page 12: The Chambers Should Now Be Filled

    chamber so that the liquid entering the fluid line flows uphill). Remove the plug from the chamber valve below the last chamber, open the filling valve and allow the liquid to slowly fill the liquid line. When the liquid line is full the plug at far end of the line can be replaced.
  • Page 13 = Initial Reading Reference Chamber 0 Ref = Current Reading Reference Chamber 1 Ref = Calibration Factor Reference Chamber Note: Negative values of ∆EL indicate settlement. (Positive values of ∆EL indicated heave). Example: The initial readings on a 4 chamber system (3 active and reference chamber) are as follows: Chamber Reading Calibration Factor...

  • Page 14: Corrections For Temperature Changes

    5. Corrections for Temperature Changes The vibrating wire sensor itself is insensitive to temperature changes within the normal operating range. The system, however, is not entirely unaffected by changes in water temperature which influence the density and therefore, the buoyancy of the fluid. The influence is relatively minor and can be accounted for to some degree by measuring the water temperature and making density corrections.

  • Page 15: Troubleshooting

    6. Troubleshooting If a transducer fails to read, the following steps should be taken 1. Check the coil resistance. Nominal coil resistance is 180Ω ± 10 plus cable resistance (22 gage copper = approximately 20Ω per 1000 feet). a) If the resistance is high or infinite, a cut cable must be suspected. b) If the resistance is low or near zero, a short must be suspected.

  • Page 16: Appendix A: Thermistor Chart

    Appendix A: Thermistor Chart 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 − 273 2 Basic Equation: A B LnR C LnR T = Temperature in °C.

  • Page 17: Appendix B: Typical Calibration Sheet

    Appendix B: Typical Calibration Sheet Sample Calibration sheet. Note that the Volume Factor, K, is used to convert the Calibration factor, C, into the Calibration Factor, G.

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