Geokon 4580 Instruction Manual
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Geokon 4580 Instruction Manual

Vw pressure transducer and barometer
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Instruction Manual
Model 4580
VW Pressure Transducer
and Barometer
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 © 1995-2019 by Geokon
®
(Doc Rev Q, 04/30/19)

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Summary of Contents for Geokon 4580

  • Page 1 Model 4580 VW Pressure Transducer and Barometer 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

    ORRECTION 4.3.1 Vented Transducers........................... 13 4.4 E ..........................13 NVIRONMENTAL ACTORS 5. MAINTENANCE ..............................14 6. TROUBLESHOOTING ............................15 APPENDIX A. MODEL 4580 SPECIFICATIONS ....................16 A.1 M 4580 P ......................16 ODEL RESSURE RANSDUCER A.2 T ) ......................16...
  • Page 6 FIGURES 1 - M 4580-2 V ................. 1 IGURE ODEL IBRATING RESSURE RANSDUCER 2 - M 4850-1 B ........................1 IGURE ODEL AROMETER 3 - M 4580 W ....................3 IGURE ODEL ONITOR NSTALLATION 4 - S .................... 5 IGURE...

  • Page 7: Theory Of Operation

    A sealed version is also available which can be used for accurate measurement of barometric pressure. However, the Model 4580- 1 Barometer as shown in Figure 2 is specially designed for this purpose.

  • Page 8: Installation

    100 units should be checked out by monitoring the sensor for a few days at a constant temperature, if possible. 2.2 Model 4580 Installation 2.2.1 Barometer The barometric sensors are calibrated at the factory and referenced to an absolute barometric reading in millibars.

  • Page 9: Piezometer

    (When the desiccant turns from blue to pink it should be replaced.) Transducer Cable Moisture Trap Water Level Weir Vent Line Ground Surface Slotted Pipe Transfer Pipe Model 4580 Pressure Transducer Figure 3 - Model 4580 Weir Monitor Installation...

  • Page 10: Pressure Transducer

    Contact Geokon for splicing materials and additional cable splicing instructions. Junction boxes and terminal boxes are available from Geokon for all types of applications. In addition, portable readouts and dataloggers are also available. Contact Geokon for specific application information.

  • Page 11: Lightning Protection

    This is the recommended method of lightning protection. • Terminal boxes available from Geokon can be ordered with lightning protection built in. The terminal board used to make the gauge connections has provision for the installation of plasma surge arrestors.

  • Page 12: 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 13: Gk-405 Readout Box

    3.2.2 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 14: Gk-403 Readout Box (Obsolete Model)

    3.3.2 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 15: Data Reduction

    4. DATA REDUCTION 4.1 Pressure Calculation The basic units utilized by Geokon for measurement and reduction of data from vibrating wire pressure transducers are the “digits” displayed on the GK-404 or GK-405 reading box. Calculation of digits is based on the following equation: Digits = �...
  • Page 16 In the special case where the Model 4580 is being used as a Barometer it is necessary to add the atmospheric pressure at the time of the initial reading. This pressure would best be obtained locally as an absolute value not corrected for height above sea level.

  • Page 17: Temperature Correction

    4.2 Temperature Correction Careful selection of materials is made in constructing the vibrating wire pressure transducer to minimize thermal effects, however, most units still have a slight temperature coefficient. Consult the supplied calibration report (see Appendix D for a sample calibration report) to obtain the coefficient for a given sensor.
  • Page 18 This will result in an error due to applying an unnecessary or excessive correction. Geokon recommends, in these cases, to independently record barometric pressure changes and correlate these with observed pressure changes to arrive at a correction factor.

  • Page 19: Vented Transducers

    When they have turned light pink in color they should be replaced. Contact Geokon for replacement capsules. 4.4 Environmental Factors Since the purpose of the transducer installation is to monitor site conditions, factors that can affect these conditions should always be observed and recorded.

  • Page 20: Maintenance

    5. MAINTENANCE Vented transducers require periodic replacement of the desiccant capsules in the moisture trap. Replace capsules when they change from blue to pink. If the sensor is installed in water with high concentrations of silts etc. it may require cleaning from time to time.

  • Page 21: Troubleshooting

    Gauges should not be opened in the field. Should difficulties arise, consult the following list of problems and possible solutions. For additional troubleshooting and support, contact Geokon. Symptom: Transducer fails to give a reading 3) Is the cable cut or crushed? This can be checked with an ohmmeter.

  • Page 22: Appendix A. Model 4580 Specifications

    2.8 lbs. 3.3 lbs. 4.4 lbs. 9.0 lbs. Table 2 - Model 4580 Pressure Transducer Specifications Notes: ¹ Other ranges available upon request. ² The accuracy of the calibration equipment. ³ 0.1% FS linearity available upon request. Also 0.1% accuracy can be achieved by using a second order polynomial instead of a linear calibration factor.

  • Page 23: 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 24: Appendix C. Use Of Second Order Polynomial To Improve Accuracy

    APPENDIX C. USE OF SECOND ORDER POLYNOMIAL TO IMPROVE ACCURACY Most calibrations use linear coefficient to calculate pressure, loads strains etc. from measured readout “digits”. If the output of the sensor is not truly linear then there will be some inaccuracy introduced into the calculated value.

  • Page 25: Appendix D. Typical Calibration Report

    APPENDIX D. TYPICAL CALIBRATION REPORT Figure 7 - Sample Model 4580 Calibration Report...

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