Campbell Scientific 253-L and 257-L (Watermark 200) Soil Matric Potential Sensors - 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/Removal ............................................................................2
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram ....3
4.2.1 257 SCWin Programming.............................................................3
4.2.2 253 SCWin Programming.............................................................7
5. Overview....................................................................12
6. Specifications ...........................................................13
7. Operation...................................................................14
7.1 Wiring ................................................................................................14
7.1.1 257 Wiring ..................................................................................14
7.1.2 253 Wiring ..................................................................................14
7.2 Programming......................................................................................15
7.2.1 CRBasic Dataloggers ..................................................................15
7.2.1.1 BRHalf Instruction ...........................................................15
7.2.1.2 Resistance Calculation .....................................................16
7.2.2 Edlog Dataloggers.......................................................................16
7.2.2.1 Program Instruction 5.......................................................16
7.2.2.2 Program Instruction 59.....................................................16
7.2.3 Calculate Soil Water Potential ....................................................17
7.2.3.1 Linear Relationship ..........................................................17
7.2.3.2 Non-Linear Relationship ..................................................18
7.2.3.3 Soil Water Matric Potential in Other Units ......................19
7.3 Example Programs .............................................................................19
7.3.1 257 Program Examples ...............................................................19
7.3.1.1 Program Example #1 — CR1000 with One 107 and
One 257.........................................................................19
7.3.1.2 Program Example #2 — CR10X with One 107 and
One 257.........................................................................20
7.3.2 253 Program Examples ...............................................................22
7.3.2.1 Program Example #3 — Five 107 Temperature Probes
and Five 253’s on AM16/32 and CR1000 ....................22
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