Easy to use and takes only minutes to register measurements, even in dry soils. Simply fill hald of the cup with soil, leaves or seeds, and then equilibrate the sample
Accuracy
The dew point sensor inside the WP4C is a primary measure of water potential, not some secondary parameter merely correlated with water potential. It measures the combined matric and osmotic potential using fundamental thermodynamics and a finely tuned calibration. Here's how it works:
The WP4C determines the relative humidty of the air above a sample in a sealed chamber (conforms to ASTM D6836). Once the sample comes into equilibrium with the vapor, relative humidity is determined using the chilled mirror method. This involves chlling a tiny mirrow unitl dew starts to form. At the dew point, the WP4C measures both mirror and sample temperature within 0.001°C. This allows for unparaleed accuracy in the -0.1MPa to -300MPa range so you can have full confidence in sample readings.
Use with HYPROP to create a full soil moisture release curve
- Precise mode
- Chilled mirror dew point technique
- Fast equilibration
- Unparalleled accuracy in the 0.1 MPa to -300 MPa range
- Durable and easy to clean
- Easy to calibrate with saturated salt solutions
- Conforms to ASTM D6836
- Use with HYPROP to create a full soil moisture release curve
| Water Potential |
Range : 0 – -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) Plant Sample : ~20 min NOTE: WP4C will display updated measurement approximately every 5 mins until stopped |
| Case Dimensions |
Length : 24.1cm Width : 22.9cm Height : 8.9cm |
| Case Material | Powder painted aluminium |
| Universal Power | 110 - 220VAC 50/60Hz |
| Sensor Types |
Chilled-mirror dew point sensor Infrared temperature sensor |
| Sample Cup Capacity |
15mL (full) 7mL (recommended) |
| Operating Temperature | 5 to 40°C |
| Weight | 3.2kg |
| Data Communications |
RS-232A serial 8-data bit ASCII code 9,600 baud, no parity 1 stop bit |
| Compliance |
EM ISO/IEC 17050:2010 (CE Mark) Compatible standard : ASTM D6836-07 |
