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WP4C Soil Water Potential Lab Instrument

Updated:2023-02-23

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  • Brand: METER
  • Model: WP4C
  • Description: Measuring soil water potential is never easy. Traditional methods such as pressure plates or filter paper have always been problematic. Not only are they extremely time consuming, but both methods hav
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Product Details

WP4C Soil Water Potential Lab Instrument Description:

User's Manual

Simply accurate. Simply fast. Simple to use.

As world experts in water potential and soil suction, it wasn’t enough to engineer an instrument that delivered consistent accuracy. We also designed it to be easy to use and take only minutes to register measurements, even in dry soils. The WP4C is a complex instrument due to its versatility, but extremely easy to use with sample sizes up to 7 ml. Simply fill half of the cup with soil, leaves or seeds, and then equilibrate the sample.

Proven first-principles method based on fundamental physics

The WP4C is so accurate, it’s used to calibrate other measurement methods and has been published extensively. Why? 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 humidity 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 chilling a tiny mirror until dew starts to form. At the dew point, the WP4C measures both mirror and sample temperature within 0.001 °C. This allows for unparalleled accuracy in the -0.1 MPa to -300 MPa range so you can have full confidence in sample readings.

World-class soil water potential measurement

Unparalleled accuracy. Simplicity of use. Fast speeds. Combine the WP4C with other LABROS instruments for a complete soil analysis. Add the PARIO for soil particle size analysis, and use data from the HYPROP and the KSAT to generate a hydraulic conductivity curve.

Only using partial curves? Get what you’ve been missing.

Now, generate full, high-resolution moisture release curves across the entire moisture range by combining WP4C data with HYPROP data. No other method generates a curve with this much detail, or with this little effort.

If you only need the dry end of the curve, the HYPROP FIT Software can be used to plug in water potential data collected by the WP4C for fitting different water retention models (i.e., van Genuchten, van Genuchten Bimodal, Fredlund & Xing, Brooks & Corey).

Save time and effort

The design of the WP4C is incredibly efficient in a number of ways. To start, you don’t have to spend a ton of time teaching your technicians. Plus, it allows for fast equilibration because of sophisticated temperature control. And a final feature that makes for a total time saver: it makes measurements on its own, so you’re free to attend to other things.

Feature:

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

WP4C Soil Water Potential Lab Instrument Specification:

Measurement Specifications 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: 15.00 – 40.00 °C
Resolution: 0.10 °C
Accuracy: ±0.20 °C
Read Time Soil Sample: ~10–15 min (precise mode)
< 5 min (fast mode)
Plant Sample: ~20 min
NOTE: WP4C will display updated measurements approximately every 5 min until stopped
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
Universal Power 110.0000 – 220.0000 V AC 50/60 Hz
Sensor Types Chilled-mirror dew point sensor
Infrared temperature sensor
Cable Type Standard RS-232 to USB cable (included)
Display 20 x 2 alphanumeric LCD with backlighting
Sample Cup Capacity 15 mL (0.5 oz) full
7 mL (0.25 oz) recommended
Operating Temperature Minimum: 5.00 °C
Typical: NA
Maximum: 40.00 °C
Weight 3.2 kg (7.1 lb)
Data Communications RS-232A serial
8-data bit ASCII codel
9,600 baud, no parityl
1 stop bit
Other Compliance Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
Compatible standard: ASTM D6836-07

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