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Instruction Manual
Model 4675LV
Weir Monitor
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 © 1991-2017 by Geokon, Inc.
(Doc Rev J, 10/23/17)
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Table of Contents
Related Manuals for Geokon 4675LV
Summary of Contents for Geokon 4675LV
- Page 1 Model 4675LV Weir Monitor 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 Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having been tampered with...
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Page 4: Table Of Contents
TABLE of CONTENTS 1. INTRODUCTION ..............................1 2. INSTALLATION PROCEDURES ........................1 2.1 P ............................1 RELIMINARY HECKS 2.2 I ..............................1 NSTALLATION 3. TAKING READINGS ............................3 3.1 GK-404 R ............................3 EADOUT 3.1.1 Operating the GK-404 ..........................3 3.2 GK-405 R ............................ -
Page 5: Introduction
2.2 Installation If the 4675LV is used in a weir box, a Stilling Well is required. The Stilling Well is provided by Geokon, in the form of a slotted, three or four inch PVC pipe. This Stilling Well must be... - Page 6 Figure 1 - Stilling Well Supports Check that the sensor is reading then push it inside the Swagelok fitting in the pipe cap and tighten the According to the instructions in Appendix C. Leave about one inch of the sensor protruding from the Swagelok.
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Page 7: Taking Readings
20 hours continuously on two AA batteries. It is designed for the readout of all Geokon vibrating wire gages 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 8: Gk-405 Readout Box
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 9: Gk-403 Readout Box (Obsolete Model)
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 10: Data Reduction
4. DATA REDUCTION 4.1 Determination of Water Elevation Each type of weir, depending on its type, shape, and size has an equation relating the volume of fluid passing over it to the height of water, H, passing over the weir. The change in height of the water is directly proportioned to the change in output of the transducer. - Page 11 Figure 4 - Typical Calibration Sheet...
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Page 12: Corrections For Temperature Changes
4.2 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 13: Maintenance
6. TROUBLE SHOOTING Should difficulties arise, consult the following list of problems and possible solutions. For additional troubleshooting and support, contact Geokon. Symptom: Thermistor resistance is too high Likely, there is an open circuit. Check all connections, terminals, and plugs. If a cut is located in the cable, splice according to recommended procedures. -
Page 14: Appendix A. Specifications
APPENDIX A. SPECIFICATIONS 4675LV Model No. Standard Ranges 150, 300, 600, 1500 mm ±0.1% F.S. Accuracy -30 to +80 °C Temperature Range Frequency Range 1400-3500 Hz Sensor and Weight: Stainless steel Materials: Sitting Well: PVC standard, stainless steel (optional) Four Conductor, 22 gage PVC jacket Cable Diameter: 1.00”... -
Page 15: 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) -273.2 Equation 3 - Resistance to Temperature Where; T = Temperature in °C. LnR = Natural Log of Thermistor Resistance A = 1.4051 ×... -
Page 16: Appendix C. Swagelok Tube Fitting Instructions
APPENDIX C. SWAGELOK TUBE FITTING INSTRUCTIONS These instructions apply to one inch (25 mm) and smaller fittings. C.1 Installation 1) Fully insert the tube into the fitting until it bumps against the shoulder. Figure 6 - Tube Insertion 2) Rotate the nut until it is finger-tight. (For high-pressure applications as well as high-safety- factor systems, further tighten the nut until the tube will not turn by hand or move axially in the fitting.) 3) Mark the nut at the six o’clock position. -
Page 17: Reassembly Instructions
C.2 Reassembly Instructions Swagelok tube fittings may be disassembled and reassembled many times. Warning! Always depressurize the system before disassembling a Swagelok tube fitting. 1) Prior to disassembly, mark the tube at the back of the nut, then make a line along the nut and fitting body flats.