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SYSTEM
3. SYSTEM
This section describes the specifications, components, and theory of the WP4C instrument.
3.1 SPECIFICATIONS
MEASUREMENT SPECIFICATIONS
Water Potential
Range 0 to –300 MPa
Resolution NA
Accuracy ±0.05 MPa from 0 to –5 MPa
1% from –5 to –300 MPa
NOTE: All vapor pressure instruments (including the WP4C) are limited by accuracy in the wet end of the water
potential range. The range of 0 to −5 MPa has an accuracy of ±0.05 MPa. For example, a measurement of −0.1 MPa
has an accuracy of ±50% of the measurement and a measurement of −1 MPa has an accuracy of ±5%. The WP4C will
not measure water potential accurately near field capacity (-0.033 MPa).
Temperature
Range 15-40 °C
Resolution 0.1 °C
Accuracy ±0.2 °C
Read Time
Soil sample
~10–15 min (precise mode)
<5 min (fast mode)
NOTE: WP4C will display updated measurements approximately every 5 min until
stopped.
Plant sample ~20 min
PHYSICAL SPECIFICATIONS
Case Dimensions
Length 24.1 cm (9.5 in)
Width 22.9 cm (9.0 in)
Height 8.9 cm (3.5 in)
Case Material
Powder painted aluminum
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