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TDR-315H Soil Moisture Sensor with SDI-12 Interface

Soil Moisture

TDR-315H Soil Moisture Sensor with SDI-12 Interface

Reference
TDR-315H
Brand
ACCLIMA

The TDR-315H is the first fully integrated, digitized Time Domain Reflectometer (TDR), giving highly accurate absolute soil moisture readings under every soil temperature and chemistry condition in which crops grow. No other soil moisture sensor on the market matches its accuracy and stability.

It brings TDR accuracy with an SDI-12 digital output, needs no external signal generation or processing electronics, and costs a fraction of the price of traditional TDRs.

What it measures

  • Soil Moisture

Price on request

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TDR-315H

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Overview

What is new

The TDR-315H takes over from the earlier Acclima TDR-315 and TDR-315L, stays fully compatible with them and adds several improvements. In a single device it combines ultra-fast waveform generation and digitizing, a precision time base with 5 ps resolution and highly sophisticated digitizing and analysis firmware, delivering true time-domain analysis of the waveforms traveling through the soil.

Compared with the TDR-315L, it offers a faster rise time, a shaped incident wave, lower power consumption and a very fast response time. Its rise time matches the TDR-315, while its power draw and its price are both much lower. The SDI-12 interface works with any data logger that complies with SDI-12 version 1.4.

Installation

The form factor suits shallower horizontal installations: the sensor is pushed into the side wall of a trench dug to the required measuring depth. A probe guide is supplied so the waveguide rods stay parallel as they are pushed into the soil.

Measurement functions

  • Volumetric water content: 0% to 100%
  • Average permittivity: 1 to 80
  • Average bulk electrical conductivity: 0 to 5000 µS/cm
  • Average temperature: -40 to +60 °C
  • Pore water EC (Hilhorst model): 0 to 55,000 µS/cm

Features

  • Large soil sample volume: 150 ml
  • SDI-12 interface, version 1.3
  • Works with SDI-12 data loggers, including the Acclima DataSnap
  • Derives VWC within ±1% from true permittivity, in soils at 4 dS/m bulk EC
  • Soil temperature resolution: ±0.2 °C
  • No calibration required: works in all soils
  • Maintenance-free, installed by simple insertion
  • Linear over 0-100% volumetric water content
  • Moisture readings stay stable across soil salinity, fertilizer content and temperature changes
  • Moisture sensing time under 1 second
  • Very low power draw, suitable for battery operation

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