PR2 Profile probe (SDI-12 Interface)

Revolutionizing Soil Moisture Profiling with Digital Efficiency

The PR2 SDI-12 Profile Probe is designed for professionals who need to understand water distribution throughout the soil root zone. This digital version of the renowned PR2 probe measures volumetric water content at up to six depths (model dependent) without the calibration requirements of other techniques. Its key advancement is the SDI-12 digital protocol, which allows dozens of probes to be daisy-chained on a simple 3-wire network, eliminating the need for multiple expensive logger channels and complex wiring. This makes it the most cost-effective solution for creating high-density sensor networks across large fields or research sites, providing unparalleled spatial data on soil hydration.

Seamless System Integration and Unmatched Flexibility

Built for integration, the PR2 SDI-12 connects effortlessly to a wide range of SDI-12 compatible data loggers from various manufacturers, with native, point-and-click support in Delta-T's GP2 logger. The probe features a robust, IP67-rated stainless steel M12 connector, ensuring a weatherproof link to standard Delta-T M12 cabling systems. Its low-power design is ideal for solar-powered, remote installations. A significant advantage is its dual-use capability; the same probe can be used for permanent installation and, when connected to a Delta-T HH2 Moisture Meter (with firmware upgrade), for portable spot-checking, offering ultimate flexibility for data validation and targeted measurements.

Key Advantages of the PR2 SDI-12 System

• Digital SDI-12 Interface: Enables multiple probes on a single data logger channel, dramatically reducing cabling costs and system complexity for large-area monitoring.
• Proven Profiling Technology: Provides reliable volumetric water content measurements at multiple depths (e.g., 10, 20, 30, 40, 60, 100 cm) using established capacitance technology.
• Full Backward Compatibility: Works with all existing PR2 access tubes and augering kits, protecting previous investments and simplifying upgrades from analog systems.
• Low Power Consumption: Optimized design draws <60 mA during operation and <2 mA in sleep mode, making it perfect for off-grid, solar-powered applications.
• Dual-Use Functionality: Can be used for permanent logging installations and for portable spot-checks with the HH2 Moisture Meter, offering exceptional value and flexibility.

Optimal Application and Use

Install the PR2 SDI-12 into a standard PR2 access tube, which should be installed vertically in the soil using the appropriate auger. Ensure the probe is inserted gently to avoid damaging the sensing rods. For permanent installations, connect the probe to your SDI-12 data network using Delta-T's EXT/SW-xx series of M12 extension cables and T-pieces. The SDI-12 address can be set as required. When connected to a compatible logger like the GP2, the probe will be powered by the bus and will take measurements upon command. For portable use, connect the probe directly to an HH2 Moisture Meter (with updated firmware) to get instant readings in the field.