Campbell-scientific CS650 and CS655 Water Content Reflectometers Manual de usuario descargar pdf (Pagina 6)

Table of Contents

7.2 The Topp Equation ............................................................................ 25

7.3 Electrical Conductivity ...................................................................... 25

7.3.1 Soil Electrical Conductivity ....................................................... 25

7.3.2 Temperature Correction of Soil Electrical Conductivity ............ 26

7.4 Error Sources in Water Content Reflectometer Measurement .......... 27

7.4.1 Probe-to-Probe Variability Error ................................................ 27

7.4.2 Insertion Error ............................................................................ 27

7.5 Temperature Dependence and Correction ......................................... 27

7.5.1 Accurate Soil Temperature Measurement .................................. 28

8. Water Content Reflectometer User-Calibration ...... 28

8.1 Need for Soil Specific Calibration Equation ..................................... 28

8.2 The User-Derived Calibration Equation ............................................ 28

8.3 Collecting Laboratory Data for Calibration ....................................... 29

8.4 Collecting Field Data for Calibration ................................................ 31

8.5 Calculations ....................................................................................... 33

9. Maintenance .............................................................. 33

10. Troubleshooting ........................................................ 34

11. References ................................................................. 35

Appendices

Discussion of Soil Water Content ......................... A-1

B. SDI-12 Sensor Support ........................................... B-1

B.1 SDI-12 Command Basics ................................................................ B-1

B.2 Changing the SDI-12 Address Using Terminal Emulator and a

Datalogger .................................................................................... B-3

B.2.1 SDI-12 Transparent Mode ........................................................ B-3

B.2.2 CR200(X) Series Datalogger Example .................................... B-4

B.2.3 CR1000 Datalogger Example ................................................... B-5

B.2.4 CR10X Datalogger Example .................................................... B-6

B.2.5 CR10X-PB Table-Based Datalogger Example ......................... B-7

Figures

4-1. CS650 Water Content Reflectometer .................................................. 2

5-1. CS650 and CS655 average current drain ............................................. 5

6-1. CS650G Insertion Guide Tool ............................................................. 8

6-2. A200 Sensor-to-PC Interface ............................................................. 11

B-1. SDI-12 transparent mode on CR200(X)-series datalogger using

control port C1/SDI12 and changing SDI-12 address from 0

to 1 ............................................................................................... B-4

B-2. SDI-12 transparent mode on CR1000 datalogger using control

port 1 and changing SD1-12 address from 3 to 1 ......................... B-5

B-3. SDI-12 transparent mode on CR10X datalogger using control

port 1 and changing SDI-12 address from 0 to 1 ......................... B-7

B-4. SDI-12 transparent mode on CR10X-PB table-based datalogger

using control port 1 and changing SDI-12 address from 0 to 1 ... B-8

1 2 3 4 5 6 7 8 9 10 11 ... 55 56

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Campbell-scientific CS650 and CS655 Water Content Reflectometers Manual de usuario Pagina 6

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