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

LoRaWAN Plant-Water Monitoring Station

The LoRaWAN Plant-Water Monitoring Station monitors plant growth, soil moisture, canopy temperature, ambient temperature, soil temperature and relative humidity.

S-Node with: DBS60 Band Dendrometer, TEROS 12 Soil Moisture sensor and ATMOS 14 Temperature and Humidity sensor.

For small stems (<40mm), the DPS40 Pivot Stem Dendrometer can be used.

DBS60 SDI-12 Band Dendrometer
Increment sensors type
rotary position
Range 64 mm of circumference
Linearity
2% of full scale
Resolution
step-less
Tape strength
15 to 20 N in the whole range, stem diameter independent
Tape temperature coefficient:
17.3 x 1-6 per °C
Operating range:
   – Temperature
-30 to 60°C
   – Humidity 0 to 100%
Size 100 x 70 x 100 mm
Weight
ca 260 g
Minimal stem diameter
8 cm
Increment range
65mm
Tightening strength 15 to 20 N

 

TEROS 12
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

 

ATMOS-14
RELATIVE HUMIDITY
RANGE 0 to 100% RH
ACCURACY Sensor measurement accuracy is variable across a range of temperatures.
Refer to the chart in Figure 1 to determine the accuracy specification for the ATMOS 14 sensor.
EQUILIBRATION TIME
(τ, 63%):
< 40 s (response time in 1 m/s air stream)
HYSTERESIS < 1% RH typical
LONG TERM DRIFT < 0.5% RH/year typical
TEMPERATURE
RANGE -40°C to 80°C
RESOLUTION 0.1°C
ACCURACY Sensor measurement accuracy is variable across a range of temperatures. Refer to the chart in Figure 2 to determine the accuracy specification for the VP-4 sensor
EQUILIBRATION TIME
(Τ, 63%)
< 400 s (response time in 1 m/s air stream)
LONG TERM DRIFT < 0.04°C / year typical
VAPOUR PRESSURE
RANGE 0 to 47 kPa
RESOLUTION 0.01 kPa
ACCURACY Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 3 to determine the accuracy specification for the VP-4 sensor.
BAROMETRIC PRESSURE
RANGE 49 to 109 kPa
RESOLUTION 0.01 kPa
ACCURACY 0.4 kPa
GENERAL
DIMENSIONS 1.96 cm (dia) x 5.4 cm (h)
POWER REQUIREMENTS 3.6 to 15 VDC, 0.03 mA quiescent, 4 mA during 300 ms measurement
RESPONSE (MEASUREMENT) TIME 300 ms
OUTPUT Decagon Digital or SDI-12
OPERATING TEMPERATURE -40°C to 80°C
CONNECTOR TYPES 3.5 mm (stereo) plug or stripped and tinned lead wires (pigtail)
CABLE LENGTH 5 m standard; custom cable length available upon request
DATA LOGGER COMPATIBILITY
(NOT EXCLUSIVE)
Meter/Decagon: Em50 Series (Firmware 2.19+)
ICT SDI-12 logger, AML, AWS, Universal Telemetry Hub
Campbell Scientific: Any logger with serial I/O
HANDHELD READER COMPATIBILITY ProCheck (rev 1.57+)
SOFTWARE COMPATIBILITY ECH2O Utility (rev 1.74)​
DataTrac (rev 3.11+)