Table of Contents
Advertisement
Quick Links
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, 2004, 2006, 2011, 2012, 2013 by Geokon, Inc.
(Doc Rev H, 6/13)
Advertisement
Table of Contents
Related Manuals for Geokon 4675LV
Summary of Contents for Geokon 4675LV
- Page 1 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.
- 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...
-
Page 5: Table Of Contents
Contents SPECIFICATIONS ..............................1 2. INSTALLATION PROCEDURES ........................2 2.1. P ............................ 2 RELIMINARY HECKS 2.2 I ..............................2 NSTALLATION 3. TAKING READINGS ............................4 3.1. O GK-403 R ....................4 PERATION OF THE EADOUT 3.2. O GK404 R ....................5 PERATION OF THE EADOUT 3.3. - Page 6 LIST of FIGURES, TABLES and EQUATIONS 1. S ........................3 IGURE TILLING UPPORTS 2 GK405 R ..........................6 IGURE EADOUT ........................8 IGURE YPICAL ALIBRATION HEET 4. D IGURE ENSITY P OF PURE WATER AS A FUNCTION OF TEMPERATURE AND PRESSURE INTENSITY PERMISSION FROM LUID ECHANICS FOR...
-
Page 7: Specifications
Specifications Model No. 4675LV Range mm 150, 300, 600, 1500 Accuracy ± 0.1% F.S. Temperature Range -30° to +80° C Frequency Range 1400-3500Hz Materials: Sensor and Stainless steel weight: PVC standard, stainless steel Stilling Well: (optional) Cable 4-Conductor, 22 gage PVC jacket Sensor Diameter - 1.00”... -
Page 8: Installation Procedures
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, 3 inch or 4 inch PVC pipe. This stilling well must be installed in a vertically plumb position in an area where there is little... - Page 9 well cap can be removed and replaced as necessary. For concrete weir boxes 4 Rawl plugs are provided. Mark out the position for four bolt holes, (see Figure 1), and drill a ½ inch (12mm) diameter hole 2 inch (50mm) deep at each location. (The spacer bar can be used to help locate the hole spacing properly).
-
Page 10: Taking Readings
Check that the sensor is reading then push it inside the Swagelok fitting in the pipe cap and tighten the Swagelok one full turn after finger tight. Leave about one inch of the sensor protruding from the Swagelok. Carefully attach the weight to the eyebolt on the base of the sensor and lower the assembly into the stilling well until the pipe cap sits firmly on top of the pipe. -
Page 11: Operation Of The Gk404 Readout Box
3.2. Operation of the GK404 Readout Box The GK-404 is a palm sized readout box which displays the Vibrating wire value and the temperature in degrees centigrade. The GK-404 Vibrating Wire Readout arrives with a patch cord for connecting to the vibrating wire gages. -
Page 12: Measuring Temperatures
Figure 2 GK405 Readout Unit For further details consult the GK405 Instruction Manual. 3.4. Measuring Temperatures Each Vibrating Wire Convergence Meter 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-403, GK-404 and GK-405 readout boxes will read the thermistor and display temperature in °C automatically. -
Page 13: 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 14 Figure 3 Typical Calibration Sheet...
-
Page 15: 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 16: Maintenance
Density and Compressibility Density is defined as the mass per unit volume, and it depends upon the temperature and pressure intensity. The density of pure water is given in Figure 4 below. Figure 4. Density p of pure water as a function of temperature and pressure intensity. -
Page 17: Sensor
5.3 Sensor Maintenance of the sensor itself is confined to periodic checks of cable connections and maintenance of terminals. The transducers themselves can not be opened for inspection. 6. Trouble Shooting __________________________________________________ If a unit fails to read, the following steps should be taken: 1. -
Page 18: Appendix 1 Thermistor Linearization Using Steinhart And Hart Log Equation
Appendix 1 Thermistor Linearization using Steinhart and Hart Log Equation Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 − Basic Equation: 273 2 . where: A B LnR C LnR T = Temperature in °C LnR = Natural Log of Thermistor Resistance A = 1.4051 ×...