Acclima Digital True TDR-305N Soil Moisture Sensor (SDI-12)

TDR-305N Soil Moisture Sensor

Product Summary

$322 – $331

Completely integrated TDR soil water content sensor (a.k.a., soil moisture sensor, probe, or meter) accurately yields VWC and BEC/PWEC with a high-speed 300 pico-second rise time for a detailed wave form analysis. Designed for high EC tolerance when taking readings. A great measurement solution for soils with exceedingly high salt levels.

The TDR-305N is a modified version of the TDR-310N. The very short waveguide allows this sensor to make very shallow measurements and to be used in higher conductivity environments with a sacrifice in total measurement volume. 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-315H. It is a complete integrated time domain reflectometer that combines ultrafast waveform generating and digitizing functions with a precision 5 picosecond 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

  • Housing designed for easy bore hole installation at any depth
  • Shorter waveguides are great for “check and go” type applications such as mobile readings on golf greens, other turf management, or limited space environments
  • Ideal for high conductivity environments
  • Soil Smart analysis works with all mineral soil types
  • SDI-12 Interface
  • 3-element 5 cm stainless steel waveguide
  • 5 m or 10 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 85
  • Medium Bulk Electrical Conductivity: 0 to 6000 µS/cm
  • Medium Temperature: -40 to +55 degrees C
  • Pore Water EC (Hilhorst Model): 0 to 55000 µS/cm


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