Soil Moisture Sensor
TDR-305N
The TDR-305N is a 5cm waveguide version of the TDR-310N. The shorter waveguide allows this sensor to make very shallow measurements and to be used in significantly higher conductivity environments. It also has a much higher amplitude waveform than the H-series sensors, which consumes more power but makes it very effective in taking measurements in challenging soil environments. Being part of the Soil Smart Series means that its advanced waveform analysis works with all mineral soil types. 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 augered 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.
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Description
The TDR-305N is a 5cm waveguide version of the TDR-310N. The shorter waveguide allows this sensor to make very shallow measurements and to be used in significantly higher conductivity
environments. It also has a much higher amplitude waveform than the H-series sensors, which consumes more power but makes it very effective in taking measurements in challenging soil environments. Being part of the Soil Smart Series means that its advanced waveform analysis works with all mineral soil types. 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 augered 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.
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
• Incident Wave Amplitude: 2.3 V
• 20% to 80% Incident Wave Rise Time: 300 ps
• Waveform Digitizing Resolution: 5 ps
• SDI-12 Interface
• 3-element 5 cm stainless steel waveguide
• 5m or 10m 3-conductor waterproof cable (standard)
• Waterproof Epoxy-filled Housing.
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°C
Pore Water EC (Hillhurst Model): 0 to 55000 µS/cm
