The SNiP-DPS is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time plant diameter measurements for continuous plant monitoring.
The base SNiP-DPS integrates 1x S-NODE and 1x DPS40 Pivot Stem Dendrometer soil moisture sensor (previously the Decagon MPS-6) to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x DPS40 Pivot Stem Dendrometer devices.
The DPS40 Pivot Stem Dendrometer is an SDI-12 Band Dendrometer designed to measure short- and long-term changes in stem circumference.
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 3x additional DPS40 Band Dendrometers or 3x other SDI-12 sensors to the base package.
The DPS40 features SDI-12 output for compatibility with a range of data logging solutions.
The DPS40 is also available with voltage output (DPV40).
Sensor has to be placed on a relatively straight and regularly shaped stem (or branch) such that the plastic cover of the electronics does not touch the measured object. The cable has to be fastened to the stem in order to avoid its influence on the sensor position. The label on the black plate on the jib must be visible – it must point outwards of the stem.
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 DPS40 SDI-12 Pivot Stem Dendrometer is designed for the measurement of the diameter of small stems or branches between 5mm and 40mm. Sensor output is calibrated directly in millimetres of stem diameter.
The sensor is designed with respect to easy and fast installation. It is fastened on the measured object by three pressure levers; the central jib turns the rotary position sensor proportionally to the object diameter. Adherence pressure is set as a compromise between the influence on plant tissues and installation stability. The bearing of the position sensor is carefully shaped for minimal effect of temperature and axial forces.
Each sensor is individually calibrated in 100 points over the whole range for excellent sensor linearity.
|Measurement Range:||5 to 40mm|
|Linearity:||± 0.5% of full scale|
|Input Voltage:||5 to 12V DC|
|Current Consumption (Idle):||20 µA|
|Current Consumption (During Measurement):||6 mA|
|Tightening Strength:||1.5 to 2N lateral levers, 2 to 3N central sensing jib|
|Temperature Measurement Accuracy:||±0.2°C|
|Operating Environment:||-40 to 60°C|
|Warm-up Time:||300 ms|
|Connection:||Three wire Escha M8 connector (male)|