Campbell AVW4 Instruction Manual
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Campbell AVW4 Instruction Manual

Use with geokon model 4500 vibrating wire piezometers and pressure transducers
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Use of the AVW1 and AVW4 with
Geokon Model 4500 Vibrating Wire
Piezometers and Pressure Transducers
Revision: 1/92
C o p y r i g h t
( c )
1 9 8 7 - 1 9 9 2
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell AVW4

  • Page 1 Use of the AVW1 and AVW4 with Geokon Model 4500 Vibrating Wire Piezometers and Pressure Transducers Revision: 1/92 C o p y r i g h t ( c ) 1 9 8 7 - 1 9 9 2 C a m p b e l l S c i e n t i f i c , I n c .

  • Page 2: Warranty And Assistance

    CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. PAGE WARRANTY AND ASSISTANCE 1. GENERAL INFORMATION 1.1 Sensor Selection ..........................1-1 1.2 Sensor Care and Installation ......................1-1 2.
  • Page 4 TABLE OF CONTENTS TABLES 2.2-1 Temperature vs. Thermistor Resistance, V, oC, and Linearization Error ........2-1 3.2-1 Calibration Data for Sensor 3998....................3-2 FIGURES 2.2-1 Temperature Measurement Error at Three Temperatures as a Function of Lead Length ..2-3 2.2-2 Temperature Measurement Error on a 1000 Foot Lead ............. 2-4 2.2-3 Temperature Measurement Error on a 3000 Foot Lead .............

  • Page 5: General Information

    USE OF THE AVW1 AND AVW4 WITH GEOKON MODEL 4500 VIBRATING WIRE PIEZOMETERS AND PRESSURE TRANSDUCERS 1. GENERAL INFORMATION 1.1 SENSOR SELECTION The vibrating wire sensors may be purchased The CR10 is the only CSI datalogger that has as either vented or sealed sensors. The vented the capability of measuring the vibrating wire sensors have a small hollow "vent tube"...
  • Page 6 AVW1/AVW4 be placed at the desired level and allowed to conditions, lower the sensor to a point just come to temperature equilibrium with its above the water level and wait 5 minutes. Use surroundings (5 minutes or more). The the multiplier, an offset of 0.0, and the multiplier determined in equation 3.2-2 should temperature correction function determined in be entered and 0.0 should be entered for the...

  • Page 7: Temperature Measurement

    SECTION 2. TEMPERATURE MEASUREMENT of the bridge resistors (±0.1%) results in a 2.1 GENERAL tolerance of ±0.03 C. The accuracy of the The vibrating wire probe includes a thermistor datalogger's voltage measurement (±0.015%) which is used to measure the temperature of results in a tolerance of ±0.01 C.
  • Page 8 AVW1/AVW4 SENSOR TEMP RESISTANCE, VOLTS CR10 ERROR OHMS OUTPUT, 9796 0.791339 0.057084 0.057084 9310 0.816459 1.045822 0.045822 8851 0.841694 2.029469 0.029469 8417 0.867031 3.011520 0.011520 8006 0.892474 3.995450 -0.00454 7618 0.917902 4.979594 -0.02040 7252 0.943253 5.963992 -0.03600 6905 0.968616 6.954119 -0.04588 6576 0.993956...

  • Page 9: Temperature Measurement Error At Three Temperatures As A Function Of Lead Length

    AVW1/AVW4 SENSOR TEMP RESISTANCE, VOLTS CR10 ERROR OHMS OUTPUT, 1123 1.754878 49.07873 0.078734 1081 1.765287 50.08636 0.086361 1040 1.775568 51.11067 0.110677 1002 1.785204 52.09809 0.098095 1.794687 53.09674 0.096746 929.6 1.803855 54.08849 0.088499 895.8 1.812697 55.07032 0.070322 863.3 1.821281 56.04819 0.048193 832.2 1.829571 57.01651...

  • Page 10: Temperature Measurement Error On A 1000 Foot Lead

    AVW1/AVW4 FIGURE 2.2-2. Temperature Measurement Error on a 1000 foot Lead. Wire is 22 AWG with 16 ohms per 1000 feet. FIGURE 2.2-3. Temperature Measurement Error on a 3000 foot Lead. Wire is 22 AWG with 16 ohms per 1000 feet.

  • Page 11: Temperature Measurement Error On A 5000 Foot Lead

    AVW1/AVW4 FIGURE 2.2-4. Temperature Measurement Error on a 5000 foot Lead. Wire is 22 AWG with 16 ohms per 1000 feet. FIGURE 2.2-5. Thermistor Linearization Error...

  • Page 12: Programming And Sensor Hook-Up

    AVW1/AVW4 When measuring the Geokon temperature 2.3 PROGRAMMING AND SENSOR HOOK-UP directly with the CR10, connect the leads and Measure the thermistor with Instruction 4 using bridge completion resistors as shown in Figure a measurement range of 2500 mV fast, an 2.3-1.

  • Page 13: Vibrating Wire Measurement

    SECTION 3. VIBRATING WIRE MEASUREMENT FIGURE 3.1-1. A Vibrating Wire Sensor in the "plucking" and "pickup" coils inducing the 3.1 GENERAL same frequency on the lines to the CR10. After Figure 3.1-1 illustrates how an increase in waiting for the non resonant frequencies to die pressure on the diaphragm decreases the out (20 ms) the CR10 accurately measures how tension on the wire attached to the diaphragm.

  • Page 14: Swept Frequency, Start And End

    AVW1/AVW4 TABLE 3.2-1. Calibration Data for Sensor 3998 Gage Factor Temp. Coeff. Zero Rdg. Period Temp. Baro. (psi/digit) (psi/oC) (digit) (usecond) (oC) (in Hg) 0.0151 -0.0698 9431 325.6 29.51 The equation to change the CR10's output into 3.3 SWEPT FREQUENCY, START AND pressure (psi) exerted on the sensor is given below: The AVW1 and AVW4 were not designed for...

  • Page 15: Resolution Vs. "# Of Cycles

    AVW1/AVW4 Some additional information concerning the SD = (2*-15.1psi/(kHz ) * 0.00015ms) swept frequency may be found in Appendix C. (500 * (325.6us/1000us/ms) SD = 0.00026246 psi NOTE: Please remember that sealed (or absolute) sensors calibrated near sea level RESOLUTION = ±0.00078738 psi will read negative at higher elevations due to the decrease in barometric pressure with Resolution improves as the number of cycles...

  • Page 16: Delay Between Measurements

    AVW1/AVW4 Example: Using sensor number 3998 and If two back to back measurements are required assuming a sensor temperature of 15 C, the they can be done one of two ways. With the corrected pressure would be: AVW4 the repetitions parameter must be set to 2--.

  • Page 17: The Avw1

    SECTION 4. THE AVW1 4.1 GENERAL The AVW1 contains circuitry needed to interface Geokon's 4500 series vibrating wire sensor to the CR10. The AVW1 is designed to interface one vibrating wire sensor (temperature and pressure) to two single ended CR10 channels.

  • Page 18: Well Monitoring Example

    AVW1/AVW4 water. The water depth above the sensor is feet (of head above the sensor). Solving the referred to as the "Reading" in the following above equation for the Offset, one obtains: equation. The Reading decreases with increasing "Distance" from lip of well to water Offset = Initial Distance + Initial Reading surface so the Distance is computed by subtracting the Reading from the Offset as...
  • Page 19 AVW1/AVW4 Vibrating Wire (SE) Z=X*F Converts psi to negative ft H20 IN Chan X Loc Pt psi Excite all reps w/EXchan 1 -2.3067 Starting Freq. (units=100 Hz) Z Loc [:-Pt FEET H20] End Freq. (units=100 Hz) No. of Cycles Z=X+F Adds the Offset to the 07: 0000 Rep delay (units=.01sec) negative of the Reading to...
  • Page 20 AVW1/AVW4 This is a blank page.

  • Page 21: The Avw4

    SECTION 5. THE AVW4 quiescent current drain. The current drain 5.1 GENERAL during the very short (2.4 ms) temperature The AVW4 contains circuitry needed to measurement is .4 mA per channel or lower. interface Geokon's 4500 series vibrating wire The current drain during each vibrating wire sensor to the CR10.

  • Page 22: Sensor Hook Up

    AVW1/AVW4 5.2 SENSOR HOOK UP FIGURE 5.2-1. Hook up for AVW4 Program: AVW4 & CR10 USED TO MEASURE 5.3 DATALOGGER PROGRAMMING 4 GEOKON SENSORS. THE FIRST SENSOR The following is a sample program that SERVES AS A BAROMETER AND IS measures four sealed Geokon sensors and SUBTRACTED FROM THE OTHER THREE stores the temperature, pressure, pressure...
  • Page 23 AVW1/AVW4 Polynomial Z=X+F ASSUMES Reps CALIBRATION TEMP. = 24 X Loc TEMP C #1 X Loc TEMP C #1 F(X) Loc [:TEMP C #1] -104.78 17-- Z Loc [:T-To*C #1] 378.11 -611.59 Z=X*Y 544.27 13-- X Loc Cpsi/C #1 -240.91 17-- Y Loc T-To*C #1 43.089...
  • Page 24 AVW1/AVW4 This is a blank page.

  • Page 25: Appendix A. Pressure Conversion Chart

    APPENDIX A. PRESSURE CONVERSION CHART...
  • Page 26 This is a blank page.

  • Page 27: Appendix B. Schematics And Stuffing Charts

    APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4...
  • Page 28 APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4...
  • Page 29 APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4...
  • Page 30 APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4...
  • Page 31 APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4...
  • Page 32 APPENDIX B. SCHEMATICS AND STUFFING CHARTS FOR AVW1 AND AVW4 This is a blank page.

  • Page 33: Appendix C. Theory And Additional Details

    APPENDIX C. THEORY AND ADDITIONAL DETAILS Change in half period = C.1 SWEPT FREQUENCY THEORY .208333 - .161290 = .047043 ms Example: f2 = 31 hundred Hz f1 = 24 hundred Hz # of clock cycle increments to cover the .047043 ms half period range is: X = (30*f1*f2)/(f2-f1) = 3189...
  • Page 34 This is a blank page.
  • Page 35 This is a blank page.
  • Page 36 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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