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WP
4
PotentiaMeter
Table of Contents
ii
When to Verify Calibration . . . . . . . . . . . . . . . . . . . . .26
How to Verify and Calibrate the WP4 . . . . . . . . .27
6. Sample Preparation
. . . . . . . . . . . . . . 31
Preparing the Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Dry Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Samples and Temperature . . . . . . . . . . . . . . . . . . . . . . .33
7. Taking a Reading
. . . . . . . . . . . . . . . . 36
How WP4 takes Readings . . . . . . . . . . . . . . . . . . . . . . .37
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Increasing your Accuracy . . . . . . . . . . . . . . . . . . . . . . .39
8. Computer Interface
. . . . . . . . . . . . . . . 41
Using Hyperterminal in Windows 98
and Windows 2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9. Theory: Water potential
. . . . . . . . 44
Water potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Measuring Water Potential . . . . . . . . . . . . . . . . . . . . .45
Effect of Temperature on Water Potential . . . . . .46
10. Cleaning and Maintenance
. . . . . 48
Tools Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Cleaning the Block and Sensors . . . . . . . . . . . . . . . . .49
Checking Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
11. Repair Instructions
. . . . . . . . . . . . . . . 53
Shipping Directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Repair Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Loaner Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
12. Troubleshooting
. . . . . . . . . . . . . . . . . . 56
Problems and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . .56