The SNiP-SPW1 is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time plant diameter measurements in relation to real-time weather parameters and soil water potential for continuous plant monitoring.
The base SNiP-SPW1 integrates 1x S-NODE and three sensors to a site’s unique network, communication and power requirements: 1x DBS60 Band Dendrometer, 1x Atmos-14, 1x TEROS-21.
The DBS60 Band Dendrometer is an SDI-12 Band Dendrometer designed to measure short- and long-term changes in stem circumference.
The Atmos-14 monitors microclimate and evapotranspiration via the measurement of Relative Humidity, Barometric Pressure, Air Temperature, and Vapor Pressure with or without a passive radiation shield.
The TEROS-21 uses solid ceramics which have a wide range of pore sizes that can typically measure soil water potential of -100kPa and drier. Solid ceramics are suited to general monitoring of soil suction within or under structures of buildings, roadways and mine sites.
See Further Specifications on the S-NODE
See Further Specifications on the DBS60 Band Dendrometer
See Further Specifications on the ATMOS-14
See Further Specifications on the TEROS-12
Further parameters can be added to the SNiP, without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application. The S-NODE can support 1x additional SDI-12 sensor to the base package.
The S-NODE (for Environmental Monitoring) has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source).
A decoder suitable for TTN will be provided based upon sensor configuration.
The DBS60 is an SDI-12 Band Dendrometer designed to measure short- and long-term changes in stem circumference.
The DBS60 SDI-12 Band Dendrometer is similar to the DBL60, but has a cable for the connection to a SDI-12 Data Logger.
Outputs:
Change in Tree Circumference (mm)
Temperature (°C)
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 10-6 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 |
(Note: The Decagon VP-4 has been replaced by the Meter 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+) |
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 |