Campbell Scientific 223-L Delmhorst Cylindrical Soil Moisture Block - Manual (Page 5)

Table of Contents
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1. Introduction.................................................................1
2. Cautionary Statements...............................................1
3. Initial Inspection .........................................................1
4. Quickstart ....................................................................2
4.1 Installation............................................................................................2
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram ....2
5. Overview......................................................................6
6. Specifications .............................................................7
7. Operation.....................................................................8
7.1 Wiring ..................................................................................................8
7.2 Programming........................................................................................9
7.2.1 Control the Multiplexer.................................................................9
7.2.1.1 CRBasic..............................................................................9
7.2.1.2 Edlog ................................................................................10
7.2.2 Excite and Measure the 223 ........................................................10
7.2.3 Calculate Sensor Resistance........................................................11
7.2.4 Calculate Soil Water Potential ....................................................11
7.2.5 Example Programs ......................................................................14
7.2.5.1 Example CR1000 Program...............................................14
7.2.5.2 Example CR10(X) Program .............................................16
7.2.5.3 Example 21X Program .....................................................18
Figures
7-1. 223 wiring ............................................................................................8
7-2. Polynomial fit to typical block resistance vs. water potential ............13
7-3. Wiring for CR1000 example ..............................................................14
7-4. Wiring for CR10(X) example ............................................................16
7-5. Wiring for example 21X program......................................................18
Tables
7-1. 223 Wiring ...........................................................................................8
7-2. Excitation and Voltage Ranges ..........................................................10
7-3. Typical Soil Water Potential, R
s
and V
s
/ V
x
......................................12
i