Campbell CS616 User Manual - Contents
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Contents
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1.
Introduction ................................................................ 1
2.
Cautionary Statements .............................................. 1
3.
Initial Inspection ........................................................ 1
4.
Quickstart ................................................................... 2
5.
Overview ..................................................................... 4
6.
Specifications ............................................................ 5
6.1
Dimensions .......................................................................................... 5
6.2
Weight .................................................................................................. 5
6.3
Electrical Specifications ....................................................................... 6
6.4
Operational Details .............................................................................. 6
7.
Installation .................................................................. 7
7.1
Orientation ........................................................................................... 7
7.2
Potential Problems with Improper Insertion ........................................ 7
7.3
Wiring .................................................................................................. 7
7.4
Datalogger Programming ..................................................................... 8
7.4.1
CS616 CRBasic Programming...................................................... 8
7.4.2
CS625 CRBasic Programming...................................................... 9
8.
Operation .................................................................. 10
8.1
Water Content Reflectometer Method for Measuring Volumetric
Water Content ................................................................................. 10
8.1.1
Response Curves ......................................................................... 10
8.1.2
Calibration Equations.................................................................. 12
8.1.3
Operating Range ......................................................................... 14
8.1.3.1
Soil Electrical Conductivity ............................................. 14
8.1.3.2
Soil Organic Matter, Clay Content, and Soil Bulk
Density .......................................................................... 15
8.1.4
Error Sources in Water Content Reflectometer Measurement .... 15
8.1.4.1
Probe-to-Probe Variability Error ...................................... 15
8.1.4.2
Insertion Error .................................................................. 15
8.1.4.3
Signal Attenuation Error .................................................. 16
8.1.5
Temperature Dependence and Correction ................................... 16
8.2
Water Content Reflectometer User-Calibration ................................. 17
8.2.1
Signal Attenuation in Conductive Soils and Need for Site-
Specific Calibration ................................................................. 17
8.2.2
User-Derived Calibration Equation ............................................ 18
8.2.3
Collecting Laboratory Data for Calibration ................................ 18
8.2.4
Collecting Field Data for Calibration .......................................... 21
8.2.5
Calculations ................................................................................ 23
9.
Maintenance ............................................................. 23