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Enabling better global research outcomes in soil, plant & environmental monitoring.

LoRaWAN Soil Monitoring Station (Capacitance)

The Capacitance LoRaWAN Soil Monitoring Station includes an EnviroPro multi-depth sub-surface soil probe or Teros 12 Soil Moisture sensors.

Capacitance sensors operate by rapidly charging and discharging a positive and ground electrode (capacitor) in the soil, generating an electromagnetic field whose charge time is related to the capacitance of the soil. Further, the capacitance is related to the dielectric permittivity of the medium between the capacitor electrodes.

EnviroPro

EnviroPro probes have been laboratory tested for compliance to all regional regulatory rules and carry CE, RCM and FCC approvals.

They are manufactured to the highest standards and are fully encapsulated to ensure maximum immunity to environmental degradation. Each probe is individually calibrated at the factory and will consistently provide reliable and repeatable data, year after year.

All of the EnviroPro range provide sensors located at 10cm intervals, and are compatible with any SDI-12 compliant logger. The communication interface may be changed to a CMOS output, either by the user, or at the factory. Other interfaces, like RS485 have been adapted, which may suit your application.

The unique EnviroPro® sub-surface Soil Probes can, depending on the model, measure moisture, temperature and salinity in one robust unit for economical and continuous monitoring and never need field re-calibration.

Applications include turf, trees, flowers, vegetables, vines, cane fields, grains and dry-land crops, and many other plantations,

Other applications include composting, mining, environmental monitoring and scientific research.

TEROS 12

More than just a sensor, the TEROS 12 is a complete soil moisture system, which addresses accuracy issues. Eliminate common problems in data – such as sensor-to-sensor variability, air gaps, or preferential flow.

Features

  • Increased volume of influence (1010 mL)
  • Easy installation (minimises air gaps for cleaner readings)
  • Electrical conductivity sensor included
  • New fast electrical conductivity method for improved EC measurements
  • Thermistor embedded in the center needle
  • Robust, epoxy body for tough field conditions
  • Minimises salinity and textural effects by using 70 MHz frequency capacitance technology
  • Steel needles cut through the soil for better soil-sensor contact
  • Easy-to-read voltage output for various data loggers
  • Ferrite core eliminates cable noise

EnviroPro Specifications

Moisture resolution: 0.01%
Salinity resolution: 0.001 dS/m
Temperature resolution: 0.01°C
Moisture accuracy: +/- 2% @ 0% VWC to 50% VWC
Useable salinity range: 0 to 6 dS/m*
*Upper limit of non-contact capacitance sensors
Salinity accuracy: +/- 5% @ 0 to 4 dS/m
+/- 5% @ 10% to 30% VWC
Temperature accuracy: +/- 1 °C @ 25 °C
Units of Measure
Moisture: Volumetric Water Content %
Salinity: dS/m ECe
Temperature: °C or °F
Operating and Electrical Specification
Interface: SDI-12 version 1.3
Wiring: Red: +6 to +15VDC
Black: Ground
Blue: Data
Yellow: Not connected (reserved for future use)
Power Supply: +6 to +15 VDC
Reverse voltage and lightning protected
Operating temperature: -20 to +60°C
Power Consumption
Sleep: 0.1mA per sensor (0.4mA for 4 sensor probe)
Active current: 1mA per sensor (4mA for 4 sensor probe)
Measurement current: 64mA @150ms per sensor

EnviroPro sensors are available in 40, 80, 120, and 160cm lengths.

TEROS 12 Specifications

Volumetric water content (VWC)
Range: Mineral soil calibration: 0.00–0.62 m3/m3
Soilless media calibration: 0.0–1.0 m3/m3
Apparent dielectric permittivity (εa): 1 (air) to 80 (water)
NOTE: The VWC range is dependent on the media the sensor is calibrated to. A custom calibration will accommodate the necessary ranges for most substrates.
Resolution: 0.001 m3/m3
Accuracy: Generic calibration: ±0.03 m3/m3 (±3.00% VWC) typical in mineral soils that have solution EC <8 dS/m
Medium specific calibration: ±0.01–0.02 m3/m3 (±1–2% VWC) in any porous medium
Apparent dielectric permittivity (εa): 1–40 (soil range) , ±1 εa (unitless) 40–80, 15% of measurement
Dielectric measurement frequency 70 MHz
Temperature
Range: −40 to 60°C
Resolution: 0.1°C
Accuracy: ±1°C
Bulk electrical conductivity (ECb)
Range: 0–10 dS/m (bulk)
Resolution: 0.001 dS/m
Accuracy: ±5% of measurement
Output DDI serial or SDI-12 communications protocol
Data logger compatibility Any data acquisition system capable of 4.0- to 15-VDC power and serial or SDI-12 communication (see compatibility chart)
Measurement volume 1010 mL
PHYSICAL SPECIFICATIONS
Dimensions Length: 9.4 cm (3.70 in)
Width: 2.4 cm (0.95 in)
Height: 7.5 cm (2.95 in)
Probe length 5.5 cm (2.17 in)
Operating temperature range Minimum: –40°C
Typical: NA
Maximum: 60°C
NOTE: Sensors may be used at higher temperatures under certain conditions; Contact Customer Support for assistance
Cable length 5 m (standard)
75 m (maximum custom cable length)
NOTE: Contact Customer Support if a nonstandard cable length is needed
Connector types 3.5-mm stereo plug connector or stripped and tinned wires
ELECTRICAL AND TIMING CHARACTERISTICS
Supply voltage (VCC) to GND Minimum: 4.0 VDC
Typical: NA
Maximum: 15.0 VDC
Digital input voltage (logic high) Minimum: 2.8 V
Typical: 3.6 V
Maximum: 3.9 V
Digital input voltage (logic low) Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Power line slew rate Minimum: 1.0 V/ms
Typical: NA
Maximum: NA
Current drain (during 25-ms measurement) Minimum: 3.0 mA
Typical: 3.6 mA
Maximum: 16.0 mA
Current drain (while asleep) Minimum: NA
Typical: 0.03 mA
Maximum: NA
Power up time (DDI serial) Minimum: 80 ms
Typical: NA
Maximum: 100 ms
Power up time (SDI-12) Minimum: NA
Typical: 245 ms
Maximum: NA
Measurement duration Minimum: 25 ms
Typical: NA
Maximum: 50 ms
COMPLIANCE Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
2014/30/EU and 2011/65/EU
EN61326-1:2013 and EN55022/CISPR 22