Multi-Parameter Soil Sensor WET150

Delta T WET150 soil sensor is the ideal sensor for research of soil conditions – and for integration into SDI-12 environmental and horticultural measurement/control systems. Measures moisture, temperature and EC. Suitable for an accurate monitoring of growing conditions. 5 year warranty.

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It was produced in collaboration with the British National Physical Laboratory NPL. When buried in soil or substrate the sensor simultaneously measures three crucial variables that influence plant growth: moisture content, temperature, and electrical conductivity (EC) – indicator of the general nutrient level. A key strength of the WET150 is its ability to reliably calculate pore water conductivity (ECp), which is the ion content of the water available to the plant.

Typical areas of use include irrigation research, crop trials, phenotyping, hydrology, soil water profiling, and forestry. Is a solution to checking the uniformity of growing conditions for many types of growing media or for irrigation optimization. It is also a powerful tool for sampling soil salinity levels (which can affect crop yields). The rugged watertight build of the WET150 also makes it ideal for use in field research and outdoor farming. WET150 sensors can also be buried at different depths to enable monitoring of soil moisture, temperature and EC profiles.

The WET150 is a digital sensor with SDI-12 communication protocol; it allow multiple networked sensors connection to a data logger, controller, or computer.

Microprocessor included in the sensor gives the ability to perform complex internal correction, compensation and averaging algorithms that enhance the quality of the data. Sensor has salso an energy saving system.








Measuring range

0 to 1.0 m3 .m-3

See graph datasheet

for ECp ≤ 800 mS.m-1

1 → 40

from 0 to 1200


-20 to + 60 °C



+/- 3%

See graph datasheet

± (3% of reading + 0.8 ε’)

1 → 40

± (10mS.m-1 + 6%)

± 0.5°C



Power supply

6 – 20 VDC

Power consumption

22 mA

Operating temperature

-20 to + 60 ° C

Sample volume

~55 x 70 mm diameter, Sample volume is weighted towards soil immediately surrounding the rods


M12, 5 pin, male


Overall: 143 x 40 mm dia

Rods: 51 mm x 2.5 mm dia


77 g

Sensor calibrations

Individual sensors are interchangeable. Recalibration advised every 5 years (depending on use)

Soil calibrations

Sensor comes complete with calibrations for mineral and organic soils plus perlite, coir, peat and mineral wool substrates



Output signal

SDI-12 protocol 1.3


WET150 KIT including sensor, meter and carrying case


Multi-Parameter Soil Sensor WET150  WET150_Data_Sheet_ver_1_4.pdf 
Multi-Parameter Soil Sensor WET150   
Multi-Parameter Soil Sensor WET150
Multi-Parameter Soil Sensor WET150
Multi-Parameter Soil Sensor WET150
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