Acclima Digital True TDR-310N Soil Moisture Sensor

A fully integrated digital TDR soil water content sensor (a.k.a., soil moisture sensor, probe, or meter) that has demonstrated superb accuracy consistently with excellent repeatability.

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The TDR-310N is a replacement to the former Acclima TDR-310L. It has a high voltage waveform output, which makes it effective in taking measurements when the soil electrical conductivity is high. It also consumes more power than the TDR-310H. It is a complete integrated time domain reflectometer that combines ultra-fast waveform generating and digitizing functions with a precision 5 pico-second resolution time base and highly sophisticated waveform digitizing and analyzing firmware that provides true time domain analysis of soil-propagated waveforms. 

Its form factor is designed for easy vertical installation in an augured hole using a 34 mm flat-bottomed auger. It mates with a 1” schedule 40 PVC pipe that acts as a handle in its installation to any desired depth. It provides reading data through a 3-wire SDI-12 interface and is compatible with any data recorder that is compliant with SDI-12 version 1.4 and earlier. 

Key Features

• SDI-12 Interface
• 3-element 10 cm stainless steel waveguide
• 5 m 3-conductor waterproof cable (standard)
• Waterproof Epoxy-filled Housing
• 20% to 80% Incident Wave Rise Time: 300 ps
• Waveform Digitizing Resolution: 5 ps
• Incident Wave Amplitude: 2.3 V

Measurement Functions

• Volumetric Water Content: 0% to 100%
• Medium Permittivity: 1 to 100
• Medium Bulk Electrical Conductivity: 0 to 3000 µS/cm
• Medium Temperature: -40 to +55 degrees C
• Pore Water EC (Hilhorst Model): 0 to 55000 µS/cm