Instruction manual

Table of Contents
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1. Introduction ................................................................. 1
2. Cautionary Statements ............................................... 1
3. Initial Inspection ......................................................... 1
4. Quickstart .................................................................... 2
5. Overview ...................................................................... 4
6. Specifications ............................................................. 6
6.1 Electrical Specifications ....................................................................... 7
6.1.1 Current .......................................................................................... 7
6.2 Operational Specifications ................................................................... 8
7. Installation ................................................................... 9
7.1 Orientation and Placement ................................................................... 9
7.2 Proper Insertion .................................................................................. 10
7.3 Datalogger Wiring.............................................................................. 11
7.4 Programming ...................................................................................... 11
8. Operation ................................................................... 12
8.1 A200 and Device Configuration Utility ............................................. 12
8.1.1 Using the A200 ........................................................................... 12
8.1.1.1 Driver Installation ............................................................ 12
8.1.1.2 RS-232 Wiring ................................................................. 12
8.1.1.3 Powering the Sensor ......................................................... 13
8.1.1.4 Determining which COM Port the A200 has been
Assigned ....................................................................... 13
8.1.2 Device Configuration Utility (DevConfig) .................................. 14
8.1.2.1 Settings Editor Tab ........................................................... 15
8.1.2.2 Send OS Tab .................................................................... 17
8.1.2.3 Terminal Tab .................................................................... 17
8.2 SDI-12 Measurements ........................................................................ 19
8.2.1 Use of Multiplexers .................................................................... 20
8.3 Water Content Reflectometer Method for Measuring Volumetric
Water Content ................................................................................. 20
8.3.1 Description of Measurement Method ......................................... 20
8.3.2 The Topp Equation ..................................................................... 21
8.3.3 Electrical Conductivity ............................................................... 21
8.3.3.1 Soil Electrical Conductivity ............................................. 21
8.3.3.2 Temperature Correction of Soil Electrical Conductivity .. 22
8.3.4 Error Sources in Water Content Reflectometer Measurement .... 22
8.3.4.1 Probe-to-Probe Variability Error ...................................... 22
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