Acclima, Inc.

- Model True TDR-310H - Soil Water-Temperature-BEC Sensor with Rounded form Factor


The TDR-310H soil water content sensor is the replacement to the former Acclima TDR-310S. It is fully compatible with the '310S but incorporates several improvements. Like the '310S it is an integrated time domain reflectometer that combines ultra-fast waveform generating and digitizing functions with a precision 5 ps 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. Its main improvements over the '310S are its faster rise time, its shaped incident wave, its lower power consumption and its very fast response time. Its interface is SDI-12 and is compatible with any data recorder that is compliant with SDI-12 version 1.4.

  • 3-element 10 cm stainless steel waveguide
  • 34 mm round cross section with glue-on protrusion for mating with 1' schedule 40 PVC pipe
  • 10 m 3-conductor waterproof cable
  • Waterproof Epoxy-filled Housing
  • 20% to 80% Incident Wave Rise Time: 150 ps
  • Waveform Digitizing Resolution: 5 ps

  • Volumetric Water Content: 0% to 100%
  • Medium Permittivity: 1 to 80
  • Medium Bulk Electrical Conductivity: 0 to 5000 nS/cm
  • Medium Temperature: -40 to +60 degrees C
  • Pore Water EC (Hilhorst Model): 0 to 55000 nS/cm

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