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WP4C
7. If the WP4C is reading within 0.05 MPa of the standard, press –Exit– and proceed with
sample readings.
If the reading is not within 0.05 MPa of the standard, a change in calibration may have
occurred or the sensor chamber may be contaminated. Clean the chamber (Section4.3)
and repeat calibration from step1.
If, after this process, readings consistently differ from the correct water potential of the
standard by more than ±0.05 MPa, a change in calibration has probably occurred. To correct
the change, use the following steps.
1. On the Results screen, press the upper right or lower right button to move the value up
(+) or down (-), respectively.
2. When the correct value for the verification standard is reached, press the –Exit– button.
The value will be stored as a linear offset.
3. Take a normal measurement of the standard.
It should read the proper value.
If results are still incorrect, contact Customer Support.
4.2 MAINTENANCE
The WP4C may be returned to METER for maintenance in the following areas: system
inspection, parts replacement, and instrument cleaning. Replacement parts can also be
ordered from METER. Contact Customer Support for more information.
4.3 CLEANING
Cleanliness of the WP4C is vital for accurate readings. Dust and sample debris can
contaminate the sampling chamber so regular cleaning is essential The WP4C ships with a
cleaning kit that should last through about 1 year of regular cleanings. New cleaning kits
can be ordered from METER.
The KIMWIPES strips included in the cleaning kit are ideal for cleaning because they leave
very little lint residue and do not have compounds in the tissue that may contaminate
the WP4C sensors. Never use cotton swabs to clean the block sensors, as these contain
adhesives and other compounds that cause contamination.
To clean the WP4C, carefully follow the instructions in this section. The procedure to clean
the WP4C involves washing, rinsing, and drying each area.
NOTE: Wash hands with soap and water, and wear clean gloves before starting the cleaning procedure. This prevents
oils from contaminating the cleaning materials, the sample chamber, and the sensors.
NOTE: Isopropyl alcohol can be substituted for the cleaning solution.
1. Turn the WP4C power OFF.
2. Unplug the WP4C.
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