Manual

229 Sensor Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

the Adobe Acrobat® bookmarks tab for links to specific sections.

1. General Description.....................................................1

1.1 Compatibility............................................................................................2

1.2 Measurement Principle.............................................................................2

2. Specifications ..............................................................4

3. Installation....................................................................4

3.1 Orientation................................................................................................4

3.2 Contact......................................................................................................4

3.3 Equilibration and Saturation of the Sensor Before Installation ................5

4. Wiring............................................................................5

5. Example Programs ......................................................6

5.1 Choosing a Reference for the Thermocouple Readings ...........................6

5.2 Adjusting for Thermal Properties of Sensor During Early Heating Times7

5.3 Datalogger Program Structure and Multiplexers......................................7

5.4 Temperature Correction............................................................................8

5.5 Example #1 — CR1000 with CE4 and Four 229s....................................9

5.6 Example #2 — CR1000 with AM16/32-series Multiplexer,

CE4 and Sixteen 229 Sensors with Temperature Correction.............11

5.7 Example #3 — CR10X with 229 Sensor................................................13

5.8 Example #4 — CR10X with AM16/32-series, CE4, and

Sixteen 229 Sensors ...........................................................................16

6. Calibration..................................................................19

6.1 General....................................................................................................19

6.2 Normalized Temperature Change and Correction for Soil Temperature......20

6.2.1 Normalized Temperature Change .................................................20

6.2.2 Correction for Soil Temperature...................................................21

6.3 Using Pressurized Extraction Methods...................................................24

6.4 General Description of Calibration/Measurement Process using

Pressure Plate Extractor .....................................................................24

6.4.1 Wiring for Calibration using Pressure Plate Extractor..................25

7. Maintenance...............................................................26

8. Troubleshooting ........................................................27