Campbell Scientific 253-L and 257-L (Watermark 200) Soil Matric Potential Sensors - Manual (Page 6)

Table of Contents
ii
7.3.2.2 Program Example #4 — Five 107 Temperature Probes
and Five 253’s on AM16/32 and CR10X Using Non-
Linear Equation............................................................ 24
7.4 Interpreting Results ........................................................................... 27
8. Troubleshooting........................................................27
9. Reference...................................................................28
Figures
5-1. 257 Soil Matric Potential Sensor with capacitor circuit and
completion resistor installed in cable. Model 253 is the same,
except that it does not have completion circuitry in the cable. ...... 13
7-1. 257 schematic .................................................................................... 14
7-2. 253 wiring example ........................................................................... 15
Tables
7-1. Excitation and Voltage Ranges for CRBasic Dataloggers................. 16
7-2. Excitation and Voltage Ranges for Edlog Dataloggers ..................... 16
7-3. Comparison of Estimated Soil Water Potential and R
s
at 21°C......... 18
7-4. Conversion of Matric Potential to Other Units.................................. 19
7-5. Wiring for Programming Example #1 ............................................... 19
7-6. Wiring for Programming Example #2 ............................................... 20
7-7. Wiring for Programming Example #3 ............................................... 23
7-8. Wiring for Programming Example #4 ............................................... 24