A guide to our latest SDI-12 Multi-Parameter Soil Sensor

WET150 Multi-Parameter Soil Sensor - Brochure

GreenTech Amsterdam 2025

Delta-T Devices is a world leading manufacturer of soil/substrate measurement and monitoring technology - offering a comprehensive range of multi-parameter soil sensors - alongside a powerful cloud data management platform (DeltaLINK-Cloud). Our sensors include the WET-2 and WET150 which produce precise and reliable measurements of soil moisture, temperature, and pore water EC. We also offer the PR2 Profile Probe (analog or SDI-12) which measures moisture at multiple points down to one metre.

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A key aim of the development project was to create a research grade sensor at a price point that encourages increased use in commercial horticulture, where such technology can bring major improvements in crop yields and quality, alongside reduced water waste.

When inserted into soil or substrate the WET150 Sensor measures three crucial variables that influence plant growth: moisture content, temperature, and EC (Electrical conductivity) – a strong indicator of nutrient levels.

The National Physical Laboratory’s involvement in the project centered around the challenges of calibrating a sensor that simultaneously measures both the conductivity of soil (EC) and the permittivity of soil – from which readings of soil moisture are generated.

David Frew of Delta-T Devices says, “We have a long history of working with the NPL on sensor designs, and their Measurement for Recovery (M4R) programme was an invaluable resource for us during our in-house development of the WET150 Sensor. Their expertise resulted in a process that enabled the WET150 to be characterized and calibrated using NPL traceable reference standards.”

The collaborative work between Delta-T Devices and NPL enabled the creation of new dielectric fluids with permittivity and conductivity properties that are representative of those typically found in soils and soil-free growing media.

David continues, “There were two very significant outputs from the M4R project; firstly, the understanding of how to design a calibration fluid with specific permittivity and conductivity properties – and secondly, delivering NPL traceable reference measurements to enable sensor characterization and calibration in these new fluids.

Much to our delight, the agreed programme of collaborative activities was up and running very quickly and it provided useful early results that were immediately beneficial to the WET150 design programme. These outcomes undoubtedly helped us to achieve our goal of developing a true research-grade soil sensor at a price point previously not thought possible.”

When buried in soil or substrate the WET150 Sensor simultaneously measures three crucial variables that influence plant growth: moisture content, temperature, and electrical conductivity (EC) - a strong indicator of the general nutrient level.

WET150 Multi-parameter Soil Sensor

Soil Moisture, temperature and EC. SDI-12 interfac

Delta-T specialises in soil moisture and wireless

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WET150 Multi-parameter Soil Sensor

Soil Moisture, temperature and EC. SDI-12 interfac

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Delta-T Devices collaborated with UK National Physical Laboratory to create their latest multi-parameter soil sensor

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Delta-T Devices

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WET150 Multi-parameter Soil Sensor

Soil Moisture, temperature and EC. SDI-12 interfac

News

Delta-T Devices collaborated with UK National Physical Laboratory to create their latest multi-parameter soil sensor

Downloads

Videos