2 ABOUT THE WP4C WP4C
2 About the WP4C
2.1 Specifications
Range: 0 to −300 MPa
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Accuracy: ± 0.05 MPa
1
from 0 to −5 MPa
1% from −5 to −300 MPa
Measurement Time:
∼10 to 15 minutes for most soil samples in precise mode
∼20 min. for plant tissue samples
< 5 minutes in fast mode (reduced accuracy)
Temperature Control: 15 to 40
◦
C (± 0.2
◦
C)
Operating Environment: 5 to 40
◦
C (41 to 104
◦
F)
Sensor Type: A chilled-mirror dew point sensor and an Infrared
temperature sensor
Sample Cup Capacity: 7 mL recommended (15 mL full)
Dimensions: 24.1 x 22.9 x 8.9 cm (9.5 x 9.0 x 3.5 in)
Weight: 3.2 Kg (7.1 lbs)
Case Material: Powder Painted Aluminum
Display: 20 x 2 alphanumeric LCD with backlighting
Data Communication: RS232A compatible, 8-data bit ASCII code,
9600 baud, no parity, 1 stop bit
Power: 110 VAC to 220 VAC, 50/60 Hz
Interface Cable: Standard RS232 to USB cable (included)
Compatible Standards: ASTM D6836-07
Warranty: One year parts and labor
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The WP4C (and all vapor pressure instruments) 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 at −0.1MPa has an accuracy
of ±50% of the reading and −1 MPa has an accuracy of ±5% of the reading. The
WP4C will not measure water potential accurately near field capacity.
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