WET150 Multi-Parameter Soil Sensor

► WET150 multi-parameter soil sensor represents the culmination of years of research and development at Delta-T Devices.

► By a number of key design innovations it delivers research-grade accuracy and build quality at a price point not previously allowed.

► WET150 is the ideal sensor for research of soil conditions and for integration into SDI-12 environmental and horticultural measurement and control systems.

An SDI-12 digital sensor that measures three crucial variables:
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 overall nutrient status.

A 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.

The WET150 sensor’s proprietary electronics produce research-grade measurement accuracy with exceptional salinity and temperature stability, essential for critical irrigation and control decisions. When the sensor is buried, the temperature measurement (essential to offset the EC measurement for optimal accuracy) is taken directly from the root zone.
Accurate monitoring of soil and substrate conditions

When installed in growing media, the WET150 can provide the accurate data needed to drive SDI-12 enabled precision automatic irrigation and environmental control systems, allowing for reduced water/fertilizer usage while improving yields and product quality.

The WET150’s robust waterproof structure also makes it ideal for use in field research and outdoor agriculture – sensors can remain buried for very long periods of time without loss of performance. WET150 sensors can also be buried at different depths to allow monitoring of soil moisture, temperature and EC profiles.
SDI-12 Digital Interface

The WET150 is a SDI-12 digital sensor (fully compliant with SDI-12 standards version 1.3). SDI-12 is a standardized interface for connecting digital sensors to a master device, typically an SDI-12-compatible data logger, wireless node, controller, or computer. SDI-12 defines standards for sensor power and digital communications.

A key strength of SDI-12 is that it supports the connection of multiple networked sensors to a single input on an SDI-12-enabled master device, reducing cost and complexity.

The WET150 (like all SDI-12 sensors) has low power consumption and features an integrated microprocessor that enables it to perform bi-directional communication with an SDI-12 master device.

The WET150 generates readings in a standard SDI-12 format that can be sent to and recognized by the master device. The inclusion of a microprocessor also gives the WET150 the ability to perform complex internal correction, compensation, and averaging algorithms that improve data quality.

The SDI-12 protocol is based on a master-slave configuration. When installed on an SDI-12 network, the master device sends data requests to individually addressed WET150s (slaves). These requests briefly wake up all WET150s on the network and result in a measurement and data sending response from the target WET150. When not responding to a request from the master, all WET150s remain in an inactive, power-saving state.