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Enabling better global research outcomes in soil, plant & environmental monitoring.

WP4 Dewpoint Potentiameter

Fast, Accurate Water Potential Measurements

Use the WP4 to measure water potential in 5 to 10 minutes. Range: 0 to -300 MPa with a resolution of 0.1 MPa.

Easy Operation

The WP4 is a bench-top instrument with a lexan sample drawer. To make a reading, set a cup in the chamber and close and latch the drawer.

Soil suction data can be stored internally or transferred to a computer or printer with the included serial RS232 interface cable.

Sample Size

Sample cups are 4 cm in diameter and 1 cm tall. They have a 15 ml capacity, but to protect the sensor from contamination we recommend that you fill them only half full.

No-Hassle Cleaning and Calibration

The WP4 sensor is easy to clean and durable. The instrument can be calibrated using saturated salt solutions (mix your own or order single-sample sized vials of standards on the accessories tab).

Chilled Mirror Dewpoint Technique

The WP4 measures water potential by determining the relative humidity of the air above a sample in a closed chamber (an AOAC-approved method). At temperature equilibrium, relative humidity is a direct measurement of water potential.

Accuracy ±0.1 MPa from 0 to -10 MPa
1% from -10 to -300 MPa
Range 0 to -300 MPa
Measurement Time ~5 minutes for most soil samples
~20 minutes for plant tissue samples
Temperature Control 15 to 50°C (± 0.2°C)
Sensor Type 1) Chilled-mirror dewpoint sensor
2) Infrared temperature sensor
Operating Environment 5 to 43°C (41 to 110°F)
Universal Power 5 to 43°C (41 to 110°F)
Warranty 1 years, parts and labour
Sample Dish Capacity 7 ml recommended (15 ml full)
Weight 3.2 kg (5.2 kg shipping weight)
Dimensions 24.1 x 22.9 x 8.9 cm (9.5 x 9.0 x 3.5 in)
Case Material Powder-painted aluminium
Data Communications RS232 compatible
8-data bit ASCII code
9600 baud
no parity
1 stop bit
Display 20 x 2 alphanumeric dot-matrix LCD with backlighting
Interface Cable Standard RS232 serial cable (included)